Facilities Staff Engineer; Mechanical

We are a fusion power company based in Everett, WA, with the mission to build the world's first fusion power plant, enabling a future with unlimited clean electricity. Our vision is a world with clean, reliable, and affordable energy for everyone.

Since Helion's founding in 2013, we have raised over $1 billion from long-time investors such as Sam Altman, Mithril, and Capricorn Investment Group as well as new investors Soft Bank and Lightspeed to propel us forward. Our last prototype, Trenta, completed 10,000 high‑power pulses and reached plasma temperatures of 100 million degrees Celsius (9 keV). We are now operating Polaris, our next prototype on the path to the world's first fusion power plant.

This is a pivotal time to join Helion. You will tackle real‑world challenges with a team that prizes urgency, rigor, ownership, and a commitment to delivering hard truths – values essential to achieving what no one has before. Together, we will change the future of energy, because the world can't wait.

Helion is seeking a Facilities Staff Engineer (Mechanical) to join our growing Facilities team. In this role, you'll be the primary engineer responsible for designing, implementing, and owning the mechanical systems that power Helion's facilities. From HVAC and utilities to specialized building systems, you'll set the standard for how our environments are designed, built, and maintained.

You’ll work closely with partners in operations, EH&S, Production and engineering to ensure our buildings are safe, reliable, and efficient. This role blends hands‑on engineering with project leadership — ideal for someone who thrives on taking complex projects from concept through completion in a fast‑paced, mission‑driven environment. This is an onsite role that reports directly to the Senior Manager of Facilities at our Everett, WA office.

• Own the design, performance, and lifecycle of mechanical systems, including HVAC, compressed air, chilled water, exhaust, and other utilities
• Establish and maintain standards for mechanical infrastructure across new and existing sites
• Lead facility mechanical projects — from scope and design through construction, commissioning, and operations
• Troubleshoot system issues and drive continuous improvement in reliability, sustainability, and cost efficiency
• Manage contractors, vendors, and consultants to ensure quality and compliance with technical and safety requirements
• Partner with EH&S to maintain compliance with codes, permitting, and environmental regulations
• Contribute to long‑term facilities planning to support Helion's expansion

• Bachelor's degree in Mechanical Engineering (or related field)
• 5+ years of experience in facilities, building systems engineering, or mechanical infrastructure projects
• Strong knowledge of HVAC, utilities, plumbing, and building automation systems
• Proven ability to own projects end‑to‑end, balancing technical depth with execution
• Experience collaborating with contractors, design teams, and permitting authorities
• Strong communication skills and ability to partner across technical and non‑technical teams
• Resourceful, proactive, and comfortable operating in a fast‑moving environment

Helion's compensation package includes a competitively benchmarked base salary, meaningful equity grants, and comprehensive benefits. Final compensation is determined through a holistic evaluation of your experience, qualifications, and our commitment to internal equity - ensuring fairness and transparency across our teams. We are committed to fostering a fair and equitable environment in every aspect of our operations, including compensation. This is an exempt salaried role.

Annual Base Pay

$150,000 - $190,000 USD

• Medical, Dental, and Vision plans for employees and their families
• 31 Days of PTO (21 vacation days and 10 sick days)
• 10 Paid holidays, plus company‑wide winter break
• Up to 5% employer 401(k) match
• Short term disability, long term disability, and life insurance
• Paid parental leave and support (up to 16 weeks)
• Annual wellness stipend

Helion is an equal opportunity employer and value diversity at our company. We do not discriminate based on race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. If you need assistance or an accommodation during the interview process, please let us know.