Confirmed on the employer's own hiring board on Oct 21, 2026. First seen by Alion on Oct 16, 2026. Commonwealth Fusion Systems scores A on the Alion truth index.
Join the power movement as a Senior Mechanical Engineer
We’re looking for a Senior Mechanical Engineer to join our R&D and equipment design team to help build the next generation of thin-film deposition technology. The Senior Mechanical Engineer will be responsible for the design and implementation of advanced R&D equipment and complex machinery. This role requires strong technical expertise, procedural discipline, and the ability to collaborate across engineering and technology functions to ensure safe, reliable, and high-performance equipment. If you enjoy working on complex design problems, mentoring others, and solving problems in a collaborative, fast-paced environment, this is your opportunity to make an impact.
What you'll do:
- Lead the design and implementation of advanced R&D equipment for thin film processing, including ownership of key mechanical modules and sub-systems
- Lead design reviews for key mechanical subsystems
- Generate and maintain interfaces with other engineering subsystems
- Report on and be accountable for project progress to stakeholders
- Work effectively within a multi-disciplinary team of top scientists and engineers
- Mentor engineering staff for effectiveness and delivery of on-time & in-spec outcomes
- Get things done: drive projects, consistently deliver, act with speed
What we’re looking for:
- Bachelor's degree in Mechanical Engineering or related field (or equivalent industrial experience)
- 8+ years of experience with 7+ years of experience working as a senior mechanical design engineer or engineering team lead in a relevant context: design and implementation of R&D systems and manufacturing equipment
- Ability to conceive of novel solutions for complex engineering systems in challenging environments
- Expertise with 3D modeling; preferred experience with SolidWorks and NX
- Experience with COMSOL, ANSYS or other FEA tools
- Ability to select and qualify vendors for components or subsystems
- Demonstrated ability to lead in either direct or matrix structures
- Strong verbal and written communication skills and a dedication to high-quality documentation
Bonus points for:
- Prior success building first-of-kind or experimental tools for material science or semiconductor R&D
- Familiarity in applying Semi-S8, ASME, ACI, ASTM, and other mechanical standards to design solutions
- Experience with the operation of equipment in a manufacturing environment
Must-have Requirements:
- Ability to occasionally lift up to 50 lbs
- Perform activities such as stooping, climbing, standing, or sitting for extended periods of time
- Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, and cryogenics
- Willingness to travel or work required nights/weekends/on-call occasionally

