Mechanical Engineer, Thermal and Fluid Systems

What we’re building

The marine industry supports recreation, global commerce, and national defense. And yet it runs on technology that hasn't meaningfully changed in fifty years. Until now.

Arc is on a mission to electrify the marine industry. We're rethinking powertrains, software, and vessel designs from first principles. And we're already executing. We started with consumers to develop and harden our core technology. We’re now scaling production of our flagship model with new models and sectors on the horizon. Now we’re extending our platform to commercial applications, starting with tugs, ferries, and defense, with years worth of signed contracts and a pipeline that spans every vessel type on the water.

The technology is proven, the momentum is building, and the opportunity is enormous. The marine industry is going electric and Arc is building the platform that powers it

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

At Arc, we encourage diversity and consider all qualified applicants equally for employment, regardless of background, identity, or status. You’re always welcome to reach out even if you don’t meet many of these qualifications. Passion and aptitude make up for a lot.

What we offer

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

Highly competitive equity grants are included with full time offers. As well as semi-annual bonuses tied to your impact, not just your tenure.

Additionally, Arc offers top-tier benefits for full-time employees, including:

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.

Our values

We move with urgency and build with care. We value these five things above all else:

Ownership over both your work and the company’s success

Empathy for colleagues and for customers

Humility in problem solving and collaboration

Pragmatism for navigating ambiguity quickly and sensibly

Inclusion of different backgrounds, opinions, cultures, and perspectives.

We want people who share and embody these values. It is vital that our values align - we’d be happy to elaborate on any or all of these during the interview process.