Senior Diagnostics Mechanical Engineer

Commonwealth Fusion Systems•Devens, MA

2d•$134,000 - $205,000•Onsite

About The Position

Commonwealth Fusion Systems is seeking a Senior Diagnostics Mechanical Engineer to support the SPARC tokamak diagnostic team. SPARC is designed to achieve net fusion energy, with diagnostic subsystems providing plasma-control inputs and scientific data for the development of ARC. The diagnostics span approximately 40 subsystems, including magnetics, interferometry, neutral pressure, spectroscopy, imaging, bolometry, neutron diagnostics, Thomson scattering, electron cyclotron emission, reflectometry, Langmuir probes, and structural temperature and strain sensing. The engineer will help complete the mechanical design and integration of diagnostic systems as they proceed through design closeout, analysis, procurement, testing, and installation. Current work includes finalizing designs and beginning assembly of front-end, in-vacuum measurement devices, addressing engineering challenges in their build and test, and designing structural components for ex-vessel data transmission to diagnostic laboratories. The role is part of an integrated team of diagnostic engineers and fusion scientists working toward demonstrating net energy from a tokamak. The posting welcomes senior and early-career engineers as well as cross-industry career changers. This full-time position is onsite and offers a salary range of $134,000–$205,000 per year, plus equity and benefits. Actual compensation depends on level, location, qualifications, and experience. Employment offers are contingent on compliance with applicable U.S. export control laws.

Requirements

Bachelor’s degree in a relevant engineering field, such as mechanical, aerospace, civil, or nuclear engineering.
At least 5 years of relevant experience designing and delivering mechanical systems.
Demonstrated experience delivering cradle-to-grave mechanical designs with nuanced environmental or performance requirements.
Experience designing for manufacturing and assembly, and collaborating with partners to oversee or carry out integrated builds.
Bias toward action, with a balance of engineering intuition and technical rigor to produce robust, simple designs quickly.
First-principles approach to engineering and ability to understand concepts and tradeoffs bridging engineering and physics.
Strong communication skills to gather inputs and distribute information across partner teams.
Ability to occasionally lift up to 50 pounds.
Ability to climb, type, stand, or sit for extended periods.
Willingness to travel or occasionally work required nights, weekends, or on-call.
Ability to work in a facility with industrial hazards, including heat, cold, noise, fumes, strong magnets, lead, high voltage, high current, pressure systems, and cryogenics.
Compliance with U.S. export control laws concerning controlled or protected technologies or information.

Nice To Haves

Experience with Siemens NX, Teamcenter, or Ansys for CAD, PLM, or analysis.
Experience with software development, particularly Python.
Experience designing large equipment that requires lifting or rigging tools for assembly.
Experience designing systems for exposure to high stress, ultra-high vacuum, high temperature, high magnetic field, or radiation environments.

Responsibilities

Guide SPARC diagnostic subsystems through design closeout, testing, and procurement in collaboration with scientists, designers, analysts, and engineers.
Integrate technical input from team experts to ensure diagnostic designs can withstand SPARC’s harsh environments and support its scientific mission.
Coordinate with manufacturing engineers on build and test strategies for complex integrated systems.
Support field builds to maintain quality and speed.
Contribute to a strong safety culture.