Mechanical Engineer

This mechanical engineering role develops equipment needed for fusion plants. The engineer takes projects from requirements definition and concept design through detailed design, prototyping, evaluation, and productization. The work includes raising technology readiness from conceptual or laboratory-stage equipment to product level.

Responsibilities include defining equipment design requirements, organizing and documenting development technologies, and creating concept designs that account for both process and structural requirements. Design validity is checked through theoretical calculations, numerical analysis, structural calculations, and process calculations, including collaboration with internal and external specialists. The engineer also considers suitable manufacturing processes, prepares detailed designs and drawings, plans and carries out prototyping and evaluation, and prepares manufacturing specifications. Supplier discussions and technical coordination are led through development and manufacturing, including activities such as specification preparation, drawing reviews, and FAT when applicable.

Required experience includes practical use of one or more of mechanics of materials, fluid mechanics, thermodynamics, and mechanical dynamics. Candidates must also have experience validating designs through structural or process calculations and experience designing equipment with 3D CAD, including concept design, detailed design, and production drawings. The CAD software is not specified.

Preferred experience includes equipment development in fusion, nuclear, space, energy, or semiconductor fields; design of vacuum equipment, pressure vessels, heat exchangers, or rotating machinery; and design validation using FEA, CFD, or other simulation methods, including comparison with experimental results. Experience negotiating with external suppliers and coordinating technical matters is also welcomed. English technical-document reading and writing or technical discussions in English are listed as preferred experience.

The work is conducted with specialists in plasma, neutrons, and magnetohydrodynamics, as well as suppliers. The position is based at either the Tokyo office in Ota-ku or the Kyoto research center in Kumiyama, Kyoto. For Tokyo-based employees, work from a satellite office in Marunouchi, Chiyoda-ku may also be possible from June 2026. Remote work may be discussed when the employee lives within commuting distance. Domestic and international transfers may occur.

The scheduled hours are 9:00 to 18:00 with a one-hour break. A flextime system may apply depending on business needs. Saturdays, Sundays, and public holidays are days off, with at least 120 annual holidays; the posting states 125 days in 2025 and 126 days in 2026. The position is a regular employee role, although hiring as a contract employee may also be possible. Annual compensation is listed as JPY 7,000,000 to JPY 9,000,000, with a monthly salary structure and adjustments based on experience, company performance, and individual evaluation. Benefits include social insurance, welfare benefits, salary increases, and special paid leave granted at joining. Indoor smoking is prohibited throughout the facilities, with a smoking room available in the building. Applicants are asked not to reapply for the same position within six months of a previous application.