Mechanical Engineer, Thermal and Fluid Systems

Who we’re looking for

We're looking for someone fired up by the mission and ready to build. You'll thrive here if you move fast, take ownership, and care about the details.

This is a full-time, on-site role at our Los Angeles headquarters.

What You'll Do

• Owning thermal and fluid systems across the vessel, including cooling loops, pumps, plumbing, bilge, and ventilation
• Running structural and thermal analysis to size and validate components before they get built
• Collaborating with naval architects on hull-to-machinery integration, including packaging, weight and LCG, foundation loads, and appendage interfaces
• Releasing drawings, GD&T, BOMs, and specifications, and driving DFM/DFA with manufacturing and supply chain
• Building and executing test plans on the bench, at the dock, and on the water, then turning that data back into design changes
• Partnering with electrical and controls engineers to integrate Arc's powertrain into the vessel
• Supporting the design of marine propulsion and drivetrain systems, including shafting, couplings, mounts, seals, bearings, and steering hardware
• Supporting USCG and ABS compliance and evaluating suppliers for critical marine hardware
• Up to 15% travel

Minimum Qualifications

• Bachelor's degree in Mechanical, Marine, Ocean, or Aerospace Engineering, Naval Architecture, or a related engineering discipline
• 3+ years designing and releasing mechanical systems for production, ideally thermal, fluid, or structural systems on vessels or vehicles
• Experience owning a design through build, test, and iteration rather than handing it off at release
• Hands-on experience with structural and thermal analysis, including FEA and hand calculations
• Proficiency with 3D CAD (SolidWorks, NX, or CATIA), GD&T, and PDM/PLM workflows
• Ability to work hands-on in the shop and on the water, including occasional sea trials
• Ability to lift, push, and pull 50 lbs
• This position may require access to information controlled under U.S. export control laws and regulations, including the International Traffic in Arms Regulations (ITAR). Applicants must be a "U.S. person" as defined by ITAR (22 CFR §120.62), i.e., a U.S. citizen, U.S. national, lawful permanent resident, or protected individual (asylee or refugee).

Bonus Qualifications

• Experience designing marine cooling, bilge, ventilation, or other commercial vessel systems
• Familiarity with USCG and ABS rules
• Experience with electric or hybrid marine propulsion
• Professional Engineer (PE) license in Mechanical (Thermal and Fluid Systems) or Naval Architecture and Marine Engineering
• Passion for taking a vessel from a blank sheet to on-water validation
• Comfortable working at a fast but sustainable pace
• Enthusiasm for boating and the water

What we offer

The base salary for this role is P2: $125,000 P3: $150,000 annually,

• Healthcare benefits — 99% employer-paid medical, dental, and vision
• Parental leave — 14 weeks fully paid for birthing and non-birthing parents
• Generous time off — Highly competitive PTO with an opportunity to earn more time with tenure
• Income protection — Life and disability insurance for all employees
• Retirement savings — Traditional and Roth 401(k) access
• Water fund — $500 for you to spend each year to get out on the water, however you choose
• Professional development — $500 annual reimbursement for professional development and a monthly AI stipend
• Safety Support- Annual reimbursement for PPE, ergonomic equipment and anything that ensures we keep our crew safe
• Captain training — Training and access to take Arc boats out with friends and family
• Office perks — Daily lunches, snacks, and good coffee while onsite
• Relocation assistance — Available depending on role eligibility.