Engineering the moment fusion becomes real

Join a once-in-a-generation effort to turn fusion energy into real, deployable infrastructure.

Starlight Engine is not building a concept or a distant promise. We are delivering the engineering, systems, and partnerships required to demonstrate fusion power in the real world—within this decade.

Open positions

Business & Corporate

HR Specialist - HR team

Job Summary

We are recruiting an HR Specialist to join the corporate division at SLE (Starlight Engine).

In this position, you will be involved from an early stage in establishing and operating HR systems and organizational infrastructure that support SLE’s business growth. You will play a direct role in contributing to the realization of fusion energy, which is positioned as one of Japan’s national strategic technology domains.

Job description

<Key Responsibilities>
You will be responsible for multiple areas of the following HR functions, depending on your experience and career interests:
1. Review and update employment regulations and other labor-related policies; establish operational rules, communicate updates internally, and design HR operational processes
2. Operate and improve systems related to domestic and international assignments, as well as domestic and overseas business travel
3. Review and manage personnel transfer and appointment processes, and oversee employee data management using HR systems
4. Handle day-to-day HR operations, including onboarding and offboarding procedures, attendance management, and general labor administration

Target person (necessary requirement)

<Required Skills & Experience>
A total of 6+ years of experience across the following areas:
・Experience serving as the primary HR lead within a Japan-based company (foreign-affiliated or domestic), covering areas such as HR system operations, labor management, training administration, and recruitment
・Fundamental knowledge of Japanese labor law, labor-related regulations, and HR systems
・Strong communication skills with the ability to respond promptly and effectively to inquiries from internal departments and employees
・Ability to manage multiple tasks simultaneously with flexibility
・Strong planning and execution skills, including the ability to prioritize tasks and drive initiatives forward effectively

Preferred qualifications

・Experience in recruitment and labor management for technical roles (e.g., engineering, manufacturing, R&D)
・Experience leading projects or teams and proactively driving initiatives
・Experience improving HR operations using HR systems and data
・Experience contributing to the development of HR systems or labor management frameworks
・Experience collaborating with overseas entities or multinational team members
・Strong problem-solving skills, including the ability to formulate hypotheses and propose solutions grounded in factual analysis
・Business-level English communication skills

Salary

Expected annual salary: JPY 4,800,000 – 11,000,000 (including an assumed 30 hours of overtime per month)

Compensation will be determined based on experience and qualifications.

Work Location

Hybrid work arrangement based at our Tokyo Headquarters (Ota-ku, Tokyo), with remote work available depending on business needs.

Working hours

9 AM to 6 PM (including 1 hour break)

Full flex-time system available (subject to company policy)

Flextime system

Possibility of relocation

Type of contract

Full-time (permanent) or Fixed-term Contract employee

Holidays

Saturdays, Sundays, national holidays, and year-end/New Year holidays

Benefits and Welfare

Full social insurance coverage, various employee benefits, Salary review based on company policy, Special paid leave granted upon joining

HR Manager - HR team

Job Summary

We are recruiting an HR leader to join the corporate division at SLE (Starlight Engine).

In this position, you will be involved from an early stage in establishing the organizational foundation that supports SLE’s business growth. You will play a direct role in contributing to the realization of fusion energy, which is positioned as one of Japan’s national strategic technology domains.

Job description

<Key Responsibilities>
As the Head of HR / HR Manager, you will lead the design and operation of human resources systems and policies across the organization, as well as oversee talent acquisition strategy and execution. Key areas of responsibility include:
・Design and operation of performance evaluation systems, job grading structures, and related compensation and allowance frameworks
・Development and management of occupational health and safety policies, as well as crisis management frameworks
・Design and administration of stock option programs
・Design and execution of recruitment systems and hiring processes

In building the HR function, you will also have the opportunity to propose and implement organizational structures, including additional hiring and outsourcing strategies, to establish a scalable and effective HR organization.

Target person (necessary requirement)

<Required Qualifications>
A total of 8+ years of experience across the following areas:
・Experience designing and operating HR and labor systems and policies for global companies or startups, including overseas entities
・Fluent English proficiency
・At least 3 years of people management experience

<Ideal Candidate Profile>
・Strong alignment with our Vision, Mission, and Values
・A proactive mindset toward improving operational processes
・Strong logical thinking and communication skills, including the ability to effectively engage with senior stakeholders such as university professors and researchers at national research institutions
・A strong interest in organizational and people development, with the passion to build teams and corporate structures from the ground up

Preferred qualifications

・Experience developing HR policies and establishing labor operations during company formation
・Experience launching and managing new HR systems within global companies or startup environments

Salary

Expected annual salary: JPY 8,000,000 – 11,000,000 (including an assumed 30 hours of overtime per month)

Compensation will be determined based on experience and qualifications.

Work Location

Otemachi, Tokyo (Tokyo Office) or remote work

Working hours

9 AM to 6 PM (including 1 hour break)

Full flex-time system available (subject to company policy)

Flextime system

Possibility of relocation

Type of contract

Full-time (permanent) or Fixed-term Contract employee

Holidays

Saturdays, Sundays, national holidays, and year-end/New Year holidays

Benefits and Welfare

Full social insurance coverage, various employee benefits, Salary review based on company policy, Special paid leave granted upon joining

Procurement Specialist

Job Summary

We are recruiting a Procurement professional to join SLE (Starlight Engine).

In this position, you will be involved from an early stage in establishing the foundational procurement infrastructure that supports SLE’s business development and operational growth. You will play a direct role in contributing to the realization of fusion energy, which is positioned as one of Japan’s national strategic technology domains.

Job description

<Key Responsibilities>
You will be responsible for the procurement of major components and parts used in domestic and international fusion experimental reactors and related systems, including high-voltage power supplies, vacuum equipment, cooling systems, and superconducting magnets.

Working closely with engineers from the development stage, you will optimize quality, cost, and delivery (QCD) while building and operating a global supply chain.

<Specific Responsibilities>
・Develop and execute procurement strategies, including supplier selection and purchasing plans
・Procure equipment, components, and services from domestic and international suppliers
・Manage RFQs, price negotiations, contract terms and conditions (T&Cs), purchase orders, and acceptance processes
・Drive cost reduction, lead-time improvement, and quality stabilization initiatives
・Oversee logistics, import/export management, supplier evaluation, and coordination with internal stakeholders
・Promote standardization and digitalization of procurement processes to improve efficiency

Target person (necessary requirement)

<Required Experience (5+ Years)>
・Experience in procurement or purchasing within manufacturing or engineering industries
・Experience negotiating pricing, contracts, and delivery schedules with domestic and international suppliers

<Required Skills>
・Business-level English proficiency for email and meeting communication
・Strong coordination skills across internal stakeholders, including engineering, quality, logistics, and finance teams

<Ideal Candidate Profile>
・Strong alignment with our Vision, Mission, and Values, and a genuine interest in contributing to the advancement of the fusion industry
・Ability to adapt to a rapidly evolving environment and proactively identify and solve problems
・Strong communication skills, with the ability to coordinate effectively across technical, quality, logistics, finance, and executive stakeholders
・Strong analytical and logical thinking skills to balance cost, quality, and delivery considerations
・Ability to negotiate and collaborate effectively with domestic and international suppliers, supported by cross-cultural understanding
・Proactive mindset toward building new systems and improving processes beyond existing frameworks
・Strong sense of ownership and persistence in delivering results in a field with limited precedents

Preferred qualifications

Salary

Expected annual salary: JPY 5,400,000 – 11,000,000 (including an assumed 30 hours of overtime per month)

Compensation will be determined based on experience and qualifications.

Work Location

Heiwajima, Ota-ku, Tokyo (Tokyo Headquarters)
*Overseas business travel required
*Potential domestic and international relocation
*Remote work may be considered for candidates residing within commuting distance of the office.

Working hours

9 AM to 6 PM (including 1 hour break)

Full flex-time system available (subject to company policy)

Flextime system

Possibility of relocation

Type of contract

Full-time (permanent) or Fixed-term Contract employee

Holidays

Saturdays, Sundays, national holidays, and year-end/New Year holidays

Benefits and Welfare

Full social insurance coverage, various employee benefits, Salary review based on company policy, Special paid leave granted upon joining

Project Controller

Job Summary

We are recruiting a Project Controller to join SLE (Starlight Engine).

In this position, you will coordinate across internal stakeholders and contribute from an early stage to the establishment and execution of core business initiatives. You will play a key role in supporting the development of fusion energy, which is positioned as one of Japan’s national strategic technology domains.

Job description

<Key Responsibilities>
・Support the establishment of a company-wide, cross-project Project Management Office (PMO) framework to enable structured and scalable project governance across SLE.
・Operate and continuously improve the project management support system once established. Responsibilities include schedule development, cost estimation, resource planning, risk management, progress monitoring, and stakeholder coordination with partner companies and research institutions. The specific scope will be adjusted based on your experience and expertise.
・Serve as a Project Manager for assigned initiatives, taking ownership of Quality, Cost, and Delivery (QCD), and leading projects to successful completion in accordance with approved plans.

Target person (necessary requirement)

<Required Qualifications (5+ Years)>
・Project management experience involving highly customized or one-of-a-kind projects, such as equipment development, manufacturing, or plant construction
・Business-level English proficiency sufficient to negotiate with overseas clients
・Knowledge of globally recognized project management frameworks (e.g., PMBOK or equivalent standards)
・Advanced proficiency in Microsoft Office tools (Excel, Word, etc.)

<Ideal Candidate Profile>
・Strong alignment with our Vision, Mission, and Values
・The ability to explore and execute all viable options to successfully deliver complex projects
・Strong curiosity and the ability to proactively absorb knowledge across emerging technologies and diverse industries
・Strong communication skills and logical thinking ability, including the ability to effectively engage with senior stakeholders such as university professors and researchers at national research institutions

Preferred qualifications

・Experience working overseas or within multinational organizations
・Project management experience in engineering firms, machinery manufacturers, or industrial manufacturing companies
・Experience establishing or operating a Project Management Office (PMO)
・PMP (Project Management Professional) certification
・Advanced English proficiency

Salary

Expected annual salary: JPY 5,400,000 – 11,000,000 (including an assumed 30 hours of overtime per month)

Compensation will be determined based on experience and qualifications.

Work Location

Hybrid work arrangement based at our Tokyo Headquarters (Ota-ku, Tokyo), with remote work available depending on business needs.

Working hours

9 AM to 6 PM (including 1 hour break)

Full flex-time system available (subject to company policy)

Flextime system

Possibility of relocation

Type of contract

Full-time (permanent) or Fixed-term Contract employee

Holidays

Saturdays, Sundays, national holidays, and year-end/New Year holidays

Benefits and Welfare

Full social insurance coverage, various employee benefits, Salary review based on company policy, Special paid leave granted upon joining

Corporate Legal Counsel

Job Summary

We are recruiting a Legal Manager to join the corporate division at SLE (Starlight Engine).

In this position, you will be involved from an early stage in overseeing a broad range of legal functions that support SLE’s business operations. You will have the opportunity to directly contribute to the social implementation of fusion energy, which is positioned as one of Japan’s national strategic technology domains.

Job description

<Key Responsibilities>
Oversee a broad range of corporate legal matters, primarily focusing on domestic legal operations.

1. Legal Support for Plant-Related Business Operations
・Drafting, reviewing, and negotiating contracts related to plant projects, including joint research agreements, technology license agreements, sales agreements, non-disclosure agreements (NDAs), and service agreements (primarily domestic matters)
・Supporting contract negotiations and risk assessment for business transactions

2. Corporate Governance and Institutional Legal Affairs
・Supporting the operation of shareholder meetings and board of directors meetings
・Compliance management and regulatory adherence
・Development and maintenance of internal policies and corporate regulations (primarily for the Japan entity)

Target person (necessary requirement)

<Required Experience (8+ Years)>
・Experience in domestic contract law and intellectual property-related legal matters at a manufacturer, engineering company, trading company, or law firm

<Required Skills>
・Ability to independently draft and prepare contracts (hands-on execution capability)
・Ability to effectively utilize legal technology and legal support tools
・Ability to consult and collaborate with external counsel appropriately without fully outsourcing responsibility

<What We’re Looking For>
・Ability to operate with the speed and agility required in a startup environment
・Balanced risk judgment — not risk-averse, but capable of accurately assessing and managing legal risk
・Proactive communication skills, including the ability to independently gather information from stakeholders and propose practical legal solutions

Preferred qualifications

・Experience in plant-related industries
・Licensed Attorney (Japan or equivalent)
・Licensed Patent Attorney
・Licensed Judicial Scrivener
・Experience reviewing English-language contracts

Salary

Expected annual salary: JPY 10,000,000 – 15,000,000 (including an assumed 30 hours of overtime per month)

Compensation will be determined based on experience and qualifications.

Work Location

Hybrid work arrangement based at our Tokyo Headquarters (Ota-ku, Tokyo), with remote work available depending on business needs.

Working hours

9 AM to 6 PM (including 1 hour break)

Full flex-time system available (subject to company policy)

Flextime system

Possibility of relocation

Type of contract

Full-time (permanent) or Fixed-term Contract employee

Holidays

Saturdays, Sundays, national holidays, and year-end/New Year holidays

Benefits and Welfare

Full social insurance coverage, various employee benefits, Salary review based on company policy, Special paid leave granted upon joining

Intellectual Property Strategy (Contract or Full-Time) - CO team

Job Summary

We are recruiting an Intellectual Property Strategy professional to join the corporate division at SLE (Starlight Engine).

In this position, you will develop and execute comprehensive intellectual property strategies across the full IP lifecycle—including invention creation, patent prosecution, protection, confidentiality management, and portfolio governance—within a fusion energy startup positioned to transform the global energy landscape.

Historically, in the fusion field, intellectual property protection was not prioritized due to the international framework established under the ITER project, which began in the 1980s under G7 agreement and encouraged broad technology sharing. Today, the landscape has shifted significantly, with increasing global competition—particularly involving China—and renewed competitive and collaborative dynamics among Western nations.

Against this backdrop, SLE is building a grounded and commercially driven technology and product strategy and is emerging as a recognized global leader in fusion-enabling technologies.

We are seeking a professional who will take ownership of our patent strategy and execution, supporting the company’s next stage of growth and global expansion.

Job description

Target person (necessary requirement)

<Required Qualifications (3+ Years of Professional Experience>
・Broad intellectual property experience at a patent firm, manufacturer, engineering company, trading company, or similar organization
・Experience developing and executing corporate IP strategy and managing IP portfolios
・Experience establishing and promoting a culture of intellectual property protection within an organization
・Experience negotiating intellectual property matters with overseas companies, including IP-related contract negotiations

<Required Skills>
・Advanced English proficiency

Preferred qualifications

・Licensed Patent Attorney (Japan or equivalent)
・Experience in intellectual property litigation or dispute matters
・Experience in corporate strategy development
・Experience in corporate cost management
・Experience in engineering design or manufacturing within technical departments

Salary

Expected annual salary: JPY 5,400,000 – 11,000,000 (including an assumed 30 hours of overtime per month)

Compensation will be determined based on experience and qualifications.

Work Location

Hybrid work arrangement based at our Tokyo Headquarters (Heiwajima, Ota-ku, Tokyo).

Working hours

For Independent Contractors:
Flexible arrangement, with availability of approximately two or more days per week expected.

For Full-time or Fixed-term employee:
9 AM to 6 PM (including 1 hour break)

Flextime system

Possibility of relocation

Type of contract

Full-time (permanent) or Fixed-term Contract employee or Independent Contractor

Holidays

Saturdays, Sundays, national holidays, and year-end/New Year holidays

Benefits and Welfare

Full social insurance coverage, various employee benefits, Salary review based on company policy, Special paid leave granted upon joining

Technical

Safety Engineering & Regulatory Affairs

Job Summary

We are recruiting individuals who will lead safety engineering and stakeholder management initiatives at SLE (Starlight Engine).

In this position, you will lead the establishment of the safety engineering function, overseeing safety assessment, safety design, regulatory engagement for permitting, external hazard evaluation, and risk communication with local governments and relevant ministries. You will play a foundational role in building the institutional and technical framework that supports a nationally significant fusion energy project from its early stages.

As a safety domain expert, you will directly contribute to the development of regulatory and policy frameworks for fusion energy, supporting the formation of a new industrial sector. This role carries critical responsibility in ensuring the safe deployment of fusion energy—positioned as both a long-standing aspiration of humanity and a strategic national technology for Japan.

Job description

<Key Responsibilities>
・Establish and lead the safety organization: Lead the formation of the safety engineering function for the FAST project and develop the necessary systems, governance structures, and procedures to ensure overall safety assurance.
・Safety assessment, design, and external hazard analysis: Conduct shielding analysis, tritium safety evaluations, and external hazard assessments (e.g., seismic events, flooding), and translate findings into actionable design requirements.
・Regulatory engagement and permitting: Lead coordination with local governments and regulatory authorities, manage safety review processes, and prepare documentation required for regulatory approvals and permitting.
・Stakeholder management: Lead risk communication with local communities, government bodies, and regulatory institutions, contributing to public acceptance and societal trust in fusion energy.
・Management of external experts and vendors: Select and manage external partners responsible for technical analyses and evaluations, ensuring quality, rigor, and integrity of deliverables.

Target person (necessary requirement)

<Required Experience (3-5+ Years in at Least One of the Following Areas>
・Practical experience in safety assessment and safety design for nuclear-related facilities (e.g., manufacturers, utilities, or plant engineering companies)
・Experience in radiation or radioactive material analysis, or in procurement and supervision of related technical services
・Experience in civil/structural safety assessment and external hazard evaluation for nuclear facilities
・Experience engaging with local governments and national authorities regarding site development or regulatory matters
・Experience as a fusion researcher
・Professional experience in safety-related work within policy or consulting fields

<Required Skills>
・Strong expertise in safety engineering and nuclear engineering
・Technical documentation skills (Japanese required; English proficiency preferred)
・Ability to conduct rational risk assessment and risk communication
・Strong stakeholder coordination and project execution skills

Preferred qualifications

・Experience in nuclear calculations (e.g., MCNP), radiation shielding design, and environmental impact assessment of radioactive materials
・Experience in regulatory approval processes, including safety review responses and preparation of submission documents
・Experience in large-scale facility construction projects
・Experience coordinating with regulatory authorities and government agencies

Salary

Expected annual salary: JPY 5,400,000 – 11,000,000 (including an assumed 30 hours of overtime per month)

Compensation will be determined based on experience and qualifications.

Work Location

Heiwajima, Ota-ku, Tokyo (Tokyo Headquarters)
*Remote work may be considered for candidates residing within commuting distance of the office.

Working hours

9 AM to 6 PM (including 1 hour break)

Full flex-time system available (subject to company policy)

Flextime system

Possibility of relocation

Type of contract

Full-time (permanent) employee

Holidays

Saturdays, Sundays, national holidays, and year-end/New Year holidays

Benefits and Welfare

Full social insurance coverage, various employee benefits, Salary review based on company policy, Special paid leave granted upon joining

Civil & Structural Engineering Lead

Job Summary

We are recruiting individuals who will contribute to safety engineering and stakeholder management at SLE (Starlight Engine).

In this position, you will be engaged in civil and structural engineering activities in preparation for the construction of the FAST (Fusion by Advanced Superconducting Tokamak) facility, including site ground investigation, seismic and base-isolation design of buildings, and facility design.

FAST presents unique load conditions and safety requirements specific to fusion energy that do not fit within conventional nuclear or thermal power plant frameworks. As such, this role requires the development of new building design philosophies that address fusion-specific structural and safety considerations.

You will also be responsible for team structuring and vendor management related to these activities. Through your expertise in civil and structural engineering, you will directly contribute to the real-world deployment of fusion energy.

Job description

<Key Responsibilities>
・Establish and lead the civil and structural engineering organization for the FAST construction project, including development of the required systems and procedures. This includes defining new design processes that address fusion-specific requirements such as airtightness, radiation shielding, and other unique technical considerations.
・Lead civil and structural aspects of the FAST project from conceptual design and detailed design through permitting, groundbreaking, and construction. In addition to conventional large-scale power plant design practices, ensure that fusion-specific performance requirements are accurately reflected in building design, including load conditions, seismic and base-isolation strategies, and structural systems.
・Lead regulatory engagement and permitting processes, including coordination with local authorities and regulatory bodies, preparation of required documentation, and development of technical justifications to ensure structural safety. Contribute to the establishment of seismic design logic appropriate for fusion facilities.
・Lead risk communication with local communities and regulatory institutions, contributing to public acceptance. Provide clear technical explanations of fusion-specific characteristics and support societal understanding of emerging technologies.

Select and manage external experts and vendors responsible for technical analysis and evaluation, ensuring quality and technical integrity of deliverables. Collaborate with external partners to develop design methodologies tailored to fusion facilities and contribute to the establishment of future industry standards.

Target person (necessary requirement)

<Required Experience (5+ Years in at Least One of the Following Areas>
・Practical experience in civil and structural design and construction projects for nuclear, thermal power, or similar large-scale facilities (e.g., construction companies, manufacturers, utilities, or plant engineering firms)
・Experience in building design, architectural design, or radiation shielding design for facilities handling radiation or radioactive materials, or experience managing the procurement and supervision of such work
・Practical experience in seismic and base-isolation design
・Project management experience related to the above fields

<Required Skills>
・Strong technical expertise in civil and structural engineering
・Technical documentation skills (Japanese required; English proficiency preferred)
・Ability to conduct rational risk assessment and risk communication
・Strong stakeholder coordination and project execution skills
・Motivation to expand expertise into emerging technical domains

Preferred qualifications

・Strong knowledge of nuclear engineering
・Experience with regulatory approval processes, including safety review responses and preparation of submission documents
・Experience independently defining design strategies by applying existing technologies to new technical domains

Salary

Expected annual salary: JPY 7,200,000 – 12,000,000 (including an assumed 30 hours of overtime per month)

Compensation will be determined based on experience and qualifications.

Work Location

Heiwajima, Ota-ku, Tokyo (Tokyo Headquarters)
*Remote work may be considered for candidates residing within commuting distance of the office.

Working hours

9 AM to 6 PM (including 1 hour break)

Full flex-time system available (subject to company policy)

Flextime system

Possibility of relocation

Type of contract

Full-time (permanent) employee

Holidays

Saturdays, Sundays, national holidays, and year-end/New Year holidays

Benefits and Welfare

Full social insurance coverage, various employee benefits, Salary review based on company policy, Special paid leave granted upon joining

Nuclear Fusion Plant Tech (Open position) - PT team

Job Summary

We are recruiting individuals who will be committed to R&D and engineering design related to fusion plant engineering at SLE (Starlight Engine).

We are leading the FAST (Fusion by Advanced Superconducting Tokamak) project, one of the world’s most advanced fusion initiatives aiming to demonstrate fusion power generation in the 2030s. The company plans to construct a fusion reactor around 2028 as a major milestone toward this goal.
We are looking for highly motivated individuals who are eager to take on the challenges of tokamak reactor design and technical demonstration, and to help accelerate the real-world deployment of fusion energy.

Job description

<Key Responsibilities>
・Engineering design for the FAST tokamak reactor
・Demonstration R&D of core technologies
・Technical specification coordination with domestic manufacturers
・Quality control and assurance activities
・Project management

The scope of responsibilities will be tailored based on your expertise and experience.

Target person (necessary requirement)

<Required Qualifications>
・Bachelor’s or Master’s degree in Mechanical Engineering, Materials Science, Chemical Engineering, Nuclear Engineering, Electrical Engineering, Electronics Engineering, or a related field
・Strong technical documentation skills (Japanese required; English proficiency preferred)

Preferred qualifications

・Strong stakeholder coordination and project execution skills
・Project management experience
・A desire to apply your existing expertise within the fusion energy field
・Motivation to build deep specialization in fusion and proactively expand into new technical domains
・Experience working in a technology-driven startup environment

Salary

Expected annual salary: JPY 5,400,000 – 12,000,000 (including an assumed 30 hours of overtime per month)

Compensation will be determined based on experience and qualifications.

Work Location

Heiwajima, Ota-ku, Tokyo (Tokyo Headquarters)
*Remote work may be considered for candidates residing within commuting distance of the office.

Working hours

9 AM to 6 PM (including 1 hour break)

Full flex-time system available (subject to company policy)

Flextime system

Possibility of relocation

Type of contract

Full-time (permanent) or Fixed-term Contract employee

Holidays

Saturdays, Sundays, national holidays, and year-end/New Year holidays

Benefits and Welfare

Full social insurance coverage, various employee benefits, Salary review based on company policy, Special paid leave granted upon joining

Instrumentation Engineer - PT team

Job Summary

We are recruiting individuals who will be committed to the R&D and design of instrumentation systems related to fusion plant engineering, as well as safety control system design, including sequence control and interlock systems, at SLE (Starlight Engine).

Job description

<Key Responsibilities>
・Design, implement, and evaluate instrumentation and control systems for the FAST tokamak reactor
・Select and specify plasma diagnostic systems using laser and spectroscopic techniques, as well as pressure, temperature, and other measurement instruments; prepare instrumentation specifications; and design control schemes and interlock systems
・Develop control logic using PLC, DCS, and SCADA systems; conduct software testing and on-site commissioning to ensure overall control system reliability, including safety-related systems
・Support system integration in collaboration with cross-functional teams, coordinate technical specifications with vendors, and provide support for installation and commissioning

Target person (necessary requirement)

<Required Qualifications>
・Bachelor’s or Master’s degree in Mechanical Engineering, Materials Science, Chemical Engineering, Nuclear Engineering, Electrical Engineering, Electronics Engineering, or a related field
・3 or more years of professional experience in instrumentation and control engineering
・Experience in the design and implementation of at least one of the following areas:
1. Plant instrumentation systems (temperature, pressure, flow, vacuum, etc.)
2. Industrial control systems such as PLC, DCS, or SCADA
3. Control systems for experimental apparatus or large-scale industrial facilities
・Experience preparing technical documentation such as instrumentation specifications, control specifications, and interlock specifications

<Ideal Candidate Profile>
・Strong alignment with our Vision, Mission, and Values
・Proactive engagement with new technologies, knowledge domains, and cross-industry collaboration
・A willingness to take initiative and embrace challenges without fear of failure

Preferred qualifications

・Advanced English proficiency
・Several years of experience working overseas and/or coordinating with international vendors
・Knowledge of nuclear engineering or radiation-related systems
・Japanese national certifications (or equivalent qualifications in other jurisdictions) in areas such as:
1. Radiation Protection Supervisor
2. Class A Hazardous Materials Handler
3. Class A High Pressure Gas Supervisor
4. Certified Energy Manager
5. Boiler Engineer
6. Chief Electrical Engineer
7. Pollution Control Manager
・Experience in instrumentation design within plant engineering, or experience in instrumentation modification and maintenance at equipment manufacturers in industries such as power generation, oil refining, chemical, or medical sectors

Salary

Expected annual salary: JPY 5,400,000 – 12,000,000 (including an assumed 30 hours of overtime per month)

Compensation will be determined based on experience and qualifications.

Work Location

Heiwajima, Ota-ku, Tokyo (Tokyo Headquarters)
*Remote work may be considered for candidates residing within commuting distance of the office.

Working hours

9 AM to 6 PM (including 1 hour break)

Full flex-time system available (subject to company policy)

Flextime system

Possibility of relocation

Type of contract

Full-time (permanent) or Fixed-term Contract employee

Holidays

Saturdays, Sundays, national holidays, and year-end/New Year holidays

Benefits and Welfare

Full social insurance coverage, various employee benefits, Salary review based on company policy, Special paid leave granted upon joining

Electrical and Electronic Engineer - PT team

Job Summary

We are recruiting individuals who will be committed to the design and maintenance of superconducting coils, power generation facilities, and various electrical systems at SLE (Starlight Engine).

Job description

<Key Responsibilites>
・Design, build, and evaluate electrical and electronic systems for the FAST tokamak reactor
・Design power supply systems, power distribution, grounding systems, protection circuits, and EMC countermeasures
・Design sensor systems, signal processing systems, and data acquisition (DAQ) systems
・Support system integration in collaboration with cross-functional teams, coordinate technical specifications with vendors, and provide support for installation and commissioning

Target person (necessary requirement)

<Required Qualifications>
・Bachelor’s or Master’s degree in Mechanical Engineering, Materials Science, Chemical Engineering, Nuclear Engineering, Electrical Engineering, Electronics Engineering, or a related field
・3 or more years of professional experience in the electrical or electronics field
・Experience in the design and implementation of at least one of the following areas:
1. Industrial power supply systems and power distribution systems
2.Control panels and electrical circuit design
3. Sensor signal processing and data acquisition (DAQ) systems
4. Preparation of electrical schematics, wiring diagrams, and equipment specifications
・Experience in electrical equipment selection and technical coordination with vendors

Preferred qualifications

Salary

Expected annual salary: JPY 5,400,000 – 12,000,000 (including an assumed 30 hours of overtime per month)

Compensation will be determined based on experience and qualifications.

Work Location

Heiwajima, Ota-ku, Tokyo (Tokyo Headquarters)
*Remote work may be considered for candidates residing within commuting distance of the office.

Working hours

9 AM to 6 PM (including 1 hour break)

Full flex-time system available (subject to company policy)

Flextime system

Possibility of relocation

Type of contract

Full-time (permanent) or Fixed-term Contract employee

Holidays

Saturdays, Sundays, national holidays, and year-end/New Year holidays

Benefits and Welfare

Full social insurance coverage, various employee benefits, Salary review based on company policy, Special paid leave granted upon joining

Plant Design Engineer - PT team

Job Summary

We are recruiting individuals who will be committed to the integrated design of plant engineering and on-site operations, taking responsibility for piping system design for fusion plants—including layout design, material specifications, stress analysis, and 3D CAD—as well as R&D related to piping systems at SLE (Starlight Engine).

Job description

<Key Responsibilities>
・Prepare and update Process Flow Diagrams (PFDs) and Piping & Instrumentation Diagrams (P&IDs) for the FAST tokamak reactor
・Develop operational design concepts with consideration for on-site plant operations
・Establish equipment and piping layouts based on installation procedures and constructability requirements
・Support system integration in collaboration with cross-functional teams, coordinate technical specifications with vendors, and provide support for installation and commissioning

Target person (necessary requirement)

<Required Qualifications>
・Bachelor’s or Master’s degree in Mechanical Engineering, Materials Science, Chemical Engineering, Nuclear Engineering, Electrical Engineering, Electronics Engineering, or a related field
・3 or more years of professional experience in process design
・Design experience in at least one of the following areas:
1. Process design for chemical plants, energy plants, vacuum systems, or similar facilities
2. Piping design or equipment layout design
3. Preparation and updating of PFDs and P&IDs
・Experience preparing technical documentation such as equipment specifications and piping specifications

Preferred qualifications

・Advanced English proficiency
・Several years of experience working overseas and/or coordinating with international vendors
・Experience of using ”industrial analysis tools (such as COMSOL、ANSYS)
・Professional experience in 3D modeling
・Knowledge of nuclear engineering or radiation-related systems
・Knowledge of nuclear engineering or radiation-related systems
・Japanese national certifications (or equivalent qualifications in other jurisdictions) in areas such as:
1. Radiation Protection Supervisor
2. Class A Hazardous Materials Handler
3. Class A High Pressure Gas Supervisor
4. Certified Energy Manager
5. Boiler Engineer
6. Chief Electrical Engineer
7. Pollution Control Manager
・Experience in plant layout and piping design

Salary

Expected annual salary: JPY 5,400,000 – 12,000,000 (including an assumed 30 hours of overtime per month)

Compensation will be determined based on experience and qualifications.

Work Location

Working hours

9 AM to 6 PM (including 1 hour break)

Full flex-time system available (subject to company policy)

Flextime system

Possibility of relocation

Heiwajima, Ota-ku, Tokyo (Tokyo Headquarters)
*Remote work may be considered for candidates residing within commuting distance of the office.

Type of contract

Full-time (permanent) or Fixed-term Contract employee

Holidays

Saturdays, Sundays, national holidays, and year-end/New Year holidays

Benefits and Welfare

Full social insurance coverage, various employee benefits, Salary review based on company policy, Special paid leave granted upon joining

Mechanical Design Engineer - PT team

Job Summary

We are recruiting individuals who will be committed to the design and R&D of heat recovery systems—including blankets, divertors, and heat exchangers—as well as tritium recovery and abatement systems at SLE (Starlight Engine).

Job description

<Key Responsibilities>
・Design major subsystems of the FAST tokamak reactor, including blankets and divertors, with responsibilities such as material selection, structural strength calculations, and thermal stress analysis
・Prepare equipment specifications and technical data sheets for pressure vessels, heat exchangers, rotating machinery, and piping systems based on plant design requirements
・Perform design and analysis using CAD tools and prepare fabrication drawings
・Support system integration in collaboration with cross-functional teams, coordinate technical specifications with vendors, and provide support for installation and commissioning

Target person (necessary requirement)

<Required Qualifications (3+ Years of Experience>
・Minimum of 3 years of professional experience in engineering projects, with a solid understanding of the design, procurement, and construction workflow
・Experience designing pressure vessels, heat exchangers, piping systems, and rotating machinery in accordance with international standards such as ASME and/or JIS
・Experience in vendor management, including schedule, cost, and quality control, as well as technical coordination such as specification discussions and document review
・Ability to develop product and manufacturing designs based on practical and operational requirements

Preferred qualifications

・Advanced English proficiency
・Several years of experience working overseas and/or coordinating with international vendors
・End-to-end R&D experience spanning from research through manufacturing design
・Experience of using ”industrial analysis tools (such as COMSOL、ANSYS)
・Experience in plant optimization, capacity expansion, or other capital investment projects
・Knowledge of nuclear engineering or radiation-related systems
・Japanese national certifications (or equivalent qualifications in other jurisdictions) in areas such as:
1. Radiation Protection Supervisor
2. Class A Hazardous Materials Handler
3. Class A High Pressure Gas Supervisor
4. Certified Energy Manager
5. Boiler Engineer
6. Chief Electrical Engineer
7. Pollution Control Manager
・Design experience in accordance with ASME and/or JSME standards

Salary

Expected annual salary: JPY 5,400,000 – 12,000,000 (including an assumed 30 hours of overtime per month)

Compensation will be determined based on experience and qualifications.

Work Location

Heiwajima, Ota-ku, Tokyo (Tokyo Headquarters)
*Remote work may be considered for candidates residing within commuting distance of the office.

Working hours

9 AM to 6 PM (including 1 hour break)

Full flex-time system available (subject to company policy)

Flextime system

Possibility of relocation

Type of contract

Full-time (permanent) or Fixed-term Contract employee

Holidays

Saturdays, Sundays, national holidays, and year-end/New Year holidays

Benefits and Welfare

Full social insurance coverage, various employee benefits, Salary review based on company policy, Special paid leave granted upon joining

Ion Beam Engineer - PT team

Job Summary

We are recruiting individuals who will be committed to the design, operation, and R&D of demonstration testing for neutral beam systems used in tokamak fusion reactors at SLE (Starlight Engine).

SLE was established in April 2025 as a group company of Kyoto Fusioneering, a global provider of key components for fusion energy systems.
We are leading the FAST (Fusion by Advanced Superconducting Tokamak) project, one of the world’s most advanced fusion initiatives aiming to demonstrate fusion power generation in the 2030s. The company plans to construct a fusion reactor around 2028 as a major milestone toward this goal.
We are looking for highly motivated individuals who are eager to take on the challenges of tokamak reactor design and technical demonstration, and to help accelerate the real-world deployment of fusion energy.

Job description

<Key Responsibilities>
・Design of neutral beam systems for the FAST tokamak reactor, including thermal analysis, vacuum exhaust analysis, structural strength calculations, electromagnetic force analysis, and power supply design
・Preparation of equipment specifications and technical data sheets for neutral beam systems
・Design, analysis, and preparation of fabrication drawings using CAD tools
・System integration in collaboration with cross-functional teams, technical coordination with vendors, and support for installation and commissioning

Target person (necessary requirement)

<Required Qualifications>
・Bachelor’s or Master’s degree in Mechanical Engineering, Materials Science, Chemical Engineering, Nuclear Engineering, Electrical Engineering, or a related field
・3 or more years of professional experience in the ion beam field
・Design experience in at least one of the following areas:
1. Semiconductor process equipment
2. Vacuum systems and related process design
3. Piping design or equipment layout design
4. Power supply development for ion beam systems
・Experience preparing technical documentation such as equipment specifications and piping specifications

<Ideal candidate profile>
・Strong alignment with our Vision, Mission, and Values
・Proactive engagement with new technologies, knowledge domains, and cross-industry collaboration
・A willingness to take initiative and embrace challenges without fear of failure

Preferred qualifications

・Several years of experience working overseas and/or coordinating with international vendors
・End-to-end R&D experience spanning from research through manufacturing design
・Experience of using ”industrial analysis tools (such as COMSOL、ANSYS)
・Design experience in accordance with ASME and/or JSME standards

Salary

Expected annual salary: JPY 5,400,000 – 12,000,000 (including an assumed 30 hours of overtime per month)

Compensation will be determined based on experience and qualifications.

Work Location

Heiwajima, Ota-ku, Tokyo (Tokyo Headquarters)
*Remote work may be considered for candidates residing within commuting distance of the office.

Working hours

9 AM to 6 PM (including 1 hour break)

Full flex-time system available (subject to company policy)

Flextime system

Possibility of relocation

Type of contract

Full-time (permanent) or Fixed-term Contract employee

Holidays

Saturdays, Sundays, national holidays, and year-end/New Year holidays

Benefits and Welfare

Full social insurance coverage, various employee benefits, Salary review based on company policy, Special paid leave granted upon joining

Neutron Analysis Engineer - PT team

Job Summary

We are recruiting individuals who will be committed to neutron analysis simulations and the design of demonstration testing for tokamak fusion reactors, serving as a Neutronics Engineer at SLE (Starlight Engine).

SLE is leading the FAST (Fusion by Advanced Superconducting Tokamak) project—one of the world’s most advanced fusion initiatives—aimed at demonstrating fusion power generation in the 2030s. As a major milestone toward this goal, we plan to construct a fusion reactor around 2028.

We are seeking highly motivated individuals who are ready to take on the challenges of tokamak reactor design and technical demonstration, and who are driven to help accelerate the real-world deployment of fusion energy.

Job description

<Key Responsibilities>
・Perform neutronics analyses for the FAST tokamak reactor as a whole or for individual subsystems and components, including evaluation of shielding performance, nuclear heating, dose rate, nuclide production, and radioactive decay characteristics
・Provide appropriate design feedback based on analysis results
・Conduct R&D related to radiation measurement systems and material irradiation
・Support system integration in collaboration with cross-functional teams, coordinate technical specifications with vendors, and provide support for installation and commissioning

Target person (necessary requirement)

<Required Qualifications (3+ Years of Professional Experience>
・Minimum of 3 years of professional experience in neutronics analysis
・Strong technical expertise in neutron analysis, including hands-on experience with commercial or open-source software such as PHITS, MCNP, OpenMC, or equivalent
・Experience using 3D CAD software (e.g., Inventor, Fusion 360, or similar)
・Ability to adapt flexibly to changes in project requirements and operating environments
・Strong curiosity and motivation to explore new technologies and knowledge domains

Preferred qualifications

・Knowledge of fast neutron reactions
・Professional experience in mechanical design and technical drawing
・Coding skills such as Python
・English proficiency sufficient to engage in technical discussions with international team members

Salary

Expected annual salary: JPY 5,400,000 – 12,000,000 (including an assumed 30 hours of overtime per month)

Compensation will be determined based on experience and qualifications.

Work Location

Heiwajima, Ota-ku, Tokyo (Tokyo Headquarters)

*Remote work may be considered for candidates residing within commuting distance of the office.

Working hours

9 AM to 6 PM (including 1 hour break)

Full flex-time system available (subject to company policy)

Flextime system

Possibility of relocation

Type of contract

Full-time (permanent) or Fixed-term Contract employee

Holidays

Saturdays, Sundays, national holidays, and year-end/New Year holidays

Benefits and Welfare

Full social insurance coverage, various employee benefits, Salary review based on company policy, Special paid leave granted upon joining

Join us in shaping the future of fusion

We are seeking companies and organizations interested in participating in and supporting our project.

Thank you for your Message

A member of our team will be in touch soon.