Mechanical engineer jobs in California

About the role

Pacific Fusion is seeking an exceptional Senior Mechanical Engineer to help create the path to commercial fusion energy. You will help with the design, analysis, integration, and validation of mechanical systems and components across our advanced fusion energy platform. This role sits at the intersection of precision engineering and first-of-kind technology, demanding both deep technical expertise and the creative problem-solving mindset needed to tackle challenges no one has solved before. You will lead collaborative projects, mentor junior engineers, and play a vital role in driving our overall development effort.

What you'll bring

• Bachelor’s degree in mechanical engineering or related field
• Strong first-principles engineering instincts and problem-solving skills
• 5+ years’ experience in mechanical design for vacuum-compatible instrumentation
• Expert proficiency in a professional 3D CAD platform (Creo, NX, or SolidWorks), GD&T, and producing detailed manufacturing drawings
• Significant experience with FEA tools (ANSYS, COMSOL) for structural and thermal analysis
• Demonstrated ability to navigate competing design constraints simultaneously: vacuum compatibility, radiation tolerance, thermal management, and tight geometric envelopes internally and between neighboring subsystems
• Proven ability to operate as an effective individual contributor: self-directed and accountable for assigned deliverables end-to-end
• Comfortable driving cross-functional stakeholders — vendors, technicians, and peer engineers — to keep mechanical deliverables on schedule
• Excellent verbal and written communication skills for technical documentation and cross-functional collaboration
• Able to work closely with team members and project manager in fast-paced environment with ambitious deadlines
• Experience in fusion, plasma physics, accelerator physics, defense, or other high-consequence technical environments.
• Familiarity with vacuum systems, cryogenics, high-voltage hardware, or pulsed power components.

Benefits