Lead Mechanical Design Engineer (Package Engineer)

This lead-class role oversees package-equipment design for fusion-plant systems such as tritium recovery and hydrogen production. The work covers integration of multiple pieces of equipment, system optimization based on vacuum, fluid and safety analyses, and the use of HAZOP to support safety and operability.

The engineer works on fusion-related R&D programs and projects involving general-purpose equipment including glove boxes, vacuum pumps, heaters, valves, cryocoolers and electromagnetic pumps. Responsibilities include preparing equipment specifications, data sheets, inspection and test plans, and request-for-proposal packages based on project requirements and upstream process designs such as PFDs and P&IDs. The role also involves coordinating with customers and suppliers to optimize designs, selecting vendors through cost and technical evaluations, reviewing vendor documents such as design drawings, strength calculations and procedures, and managing procurement, fabrication, testing and delivery schedules.

Required experience includes work on relatively large and complex package equipment in overseas EPC projects as a contractor, subcontractor or vendor, covering design, fabrication or construction-related activities. Six or more years is the stated guideline. Candidates must understand the importance of complying with an ISO 9001-equivalent quality management system and related processes. Experience managing project progress, cost and quality with internal and external stakeholders, negotiating specifications and reviewing documents is also required, with six or more years given as a guideline. Basic understanding of ASME Section VIII, ASME B31.3, seismic structural calculations for steel support structures, LSD and ASD is required.

Preferred experience includes chemical and process calculation design, such as vacuum-system conductance, piping and equipment pressure loss, and catalyst sizing using reaction-rate equations. Experience participating in HAZOP meetings and basic knowledge of HAZOP, LOPA, SIL Verification, process safety and instrumented safety design are also welcomed, as are equipment-layout planning using 3D tools and WPS/PQR review.

The work relates to integrated plant systems that support fuel circulation, energy extraction and safe continuous operation of fusion facilities. The posting describes leadership from R&D through implementation and on-site introduction, with responsibility for building plant functions around tritium processing, vacuum systems and fuel-cycle equipment. It also seeks someone willing to engage with new technologies, knowledge and different industries, take an active approach to trying new things, and consider the overall plant rather than only one specialty.

The employment type is regular employee, although contract employment may also be considered. Listed work locations are the Tokyo headquarters in Ota-ku, Tokyo; the Kyoto Research Center in Kumiyama, Kyoto; and overseas subsidiaries in the UK, the US and Germany. For Tokyo-based work, the Marunouchi satellite office may also be used from June 2026. Remote work is negotiable for someone living within commuting distance, and domestic or international transfers may be possible. Working hours are 9:00 to 18:00 with a one-hour break; flextime may apply depending on business needs. Saturdays, Sundays and public holidays are holidays, with at least 120 annual holidays. Social insurance, other benefits, salary increases and special paid leave granted upon joining are stated. The annual salary range in the JobPosting data is JPY 7,000,000 to 9,000,000; the monthly salary is negotiable according to experience and may vary with company performance and individual evaluation. Indoor smoking is prohibited, with a smoking room available in the building.