Mechanical Engineer

Avalanche • Seattle, WA

14d • $111,000 - $155,000 • Onsite

About The Position

Avalanche Energy is seeking a Mechanical Engineer to design, build, and maintain the mechanical systems supporting its compact fusion devices. The role works directly on vacuum hardware, structural assemblies, thermal management systems, and laboratory infrastructure for experiments that are designed, built, and iterated rapidly.

This is a hands-on, lab-centered engineering role spanning CAD modeling, component selection, fabrication, assembly, testing, and troubleshooting. The work includes precision vacuum systems, structural design, thermal and high-voltage management, and integration with experimental hardware. Materials include stainless steels, refractory metals, and ceramics. The position focuses on making complex mechanical systems work reliably and repeatably, rather than primarily desk-based or simulation-first work.

The role is preferably onsite at the Tukwila, Washington site to support laboratory work and integration with experimental teams. Occasional travel may be needed for equipment procurement, integration, or collaboration. The schedule is standard business hours, with flexibility during experimental campaigns or critical test periods.

Requirements

• B.S. degree or higher in mechanical engineering, aerospace engineering, or a closely related field.
• 5–8 years of post-degree experience in hands-on mechanical engineering roles; laboratory or experimental hardware experience is preferred.
• Strong command of mechanical engineering fundamentals, including structural analysis, thermal systems, fluid mechanics, and materials selection.
• Proficiency with 3D CAD tools such as SolidWorks, CATIA, or equivalent for design, assembly modeling, and drawing generation.
• Experience designing, assembling, and operating vacuum systems, including familiarity with pumping systems, gauging, and leak checking.
• Experience with thermal management design, including heat transfer analysis, cooling system design, and thermal interface materials.
• Experience working with machine shops and fabrication processes, including tolerance specification, GD&T, and hands-on assembly of precision mechanical hardware.
• Familiarity with FEA tools for structural or thermal analysis, such as ANSYS, Abaqus, or equivalent.
• Comfort working directly with physical hardware in a laboratory or machine shop, including hands-on assembly, installation, and testing.

Nice To Haves

• Experience designing or building hardware for laboratory experiments, research programs, or scientific instruments.
• Experience designing or fabricating with ceramic materials, including MACOR or Alumina.
• Experience with high-vacuum or ultra-high-vacuum (HV/UHV) systems, including system design, bakeout, and troubleshooting.
• Familiarity with plasma physics hardware or fusion-related systems, such as magnetic coils, ion sources, beam optics, or high-voltage electrical feedthroughs.
• Experience with precision machining or hands-on fabrication, including lathe, mill, or other shop equipment.
• Experience working with cryogenic systems, high-pressure hardware, or other mechanically demanding environments.

Responsibilities

• Design, build, and maintain mechanical and vacuum systems supporting fusion experiments, diagnostics, and laboratory infrastructure.
• Work with physicists and engineers to conceive, implement, and refine mechanical systems for experimental hardware from concept through fabrication, assembly, and iteration.
• Specify, procure, fabricate, and test mechanical hardware, including vacuum vessels, structural mounts, thermal interfaces, feedthroughs, and precision mechanical assemblies.
• Troubleshoot mechanical and vacuum systems, diagnosing issues related to leaks, thermal performance, structural loading, alignment, and hardware fit-up.
• Support experiment operation by setting up, validating, and maintaining mechanical systems, vacuum hardware, and associated diagnostics.
• Provide mechanical insight into experimental results, including interpretation of hardware performance, system behavior, and failure modes.
• Improve laboratory mechanical practices, documentation, fabrication standards, and build processes.

Benefits

• 100% employer-paid medical, dental, and vision premiums.
• 10 paid holidays and a company-wide December holiday break.
• Generous paid vacation and sick time.
• Small, tight-knit team with low barriers to action.
• Exposure to a wide variety of problems and hands-on professional growth.
• Weekly employer-provided team meals, a well-stocked kitchen, and employee events on and off-site.
• Opportunity for equity.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level