Mechanical Design Engineer

Pacific Fusion was founded in 2023 with the mission to power the world with abundant, affordable, clean energy. We are rapidly designing and building a pulser-driven inertial fusion system to achieve net facility gain (more fusion energy output than stored energy input). In parallel, we are developing the key components required to build affordable fusion systems. Our plans are ambitious. We have raised over $900M so far from incredible investors, resourcing us to deliver on these plans. We are bringing together the best scientists, engineers, and operators from the fusion community, hard tech industry, and other sectors. We are united by a shared sense of urgency to provide clean power for the world, particularly managing climate change while meeting growing global energy demand.

About the Role

As a Mechanical Design Engineer, you will help with the design, development, and integration and validation of mechanical components and systems integral to our advanced fusion energy systems. This role requires a top-tier combination of technical expertise, problem-solving skills, and a proactive mindset to meet the exciting challenges in the field of fusion energy.

Responsibilities

• Design and analyze large, high-performance vacuum seals for water-to-air, air-to-high-vacuum, and water-to-high-vacuum transitions
• Lead experimental design and testing in collaboration with internal teams, external vendors, and academic partners
• Conduct research into novel sealing techniques; define, execute, and evaluate test campaigns
• Perform FMEA and tolerance stack-up analyses to ensure seal reliability and system safety
• Design test assemblies and risk-reduction
• Review and present technical work across multidisciplinary teams; contribute to system-level integration discussions
• Provide subject-matter expertise in sealing strategies and help guide the integration of systems in the target area
• Document sealing processes, validation data, and lessons learned
• Mentor and support junior engineers on design and integration challenges

Qualifications

• Bachelor's or Master's degree in Mechanical, Aerospace, or a related engineering field, or equivalent experience
• 5+ years of mechanical design experience with a focus on vacuum seals and systems, including rough, high, and ultra-high vacuum environments
• Strong proficiency in CAD, FEM, and engineering analysis tools
• Proven expertise in tolerance analysis, FMEA, seal design, and mechanical integration

Pay

Pay range: $138,100—$263,800 USD

Benefits

• Industry-competitive salary
• Equity plan
• 6% employer 401k matching
• Generous paid time off (including sick leave, vacation, paid family leave)
• Medical, Dental, and Vision insurance

Actual base salary offered will be determined by: experience, skills, and work location. This range is for base salary, our total compensation includes equity and benefits.