Senior Mechanical Engineer

What we're buildingThe 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 forWho We're Looking ForAs Arc's Mechanical Engineer, you will own the design and integration of complex electromechanical systems across the full vehicle lifecycle- from early concept and requirements through prototyping, validation, sea trials, and production.This is a full-time, on-site role at our Los Angeles headquarters reporting to our Manager, Mechanical Systems EngineeringWhat you'll doWorking across mechanical, electrical, thermal, and manufacturing domainsUnderstanding how assemblies, subsystems, and components interact as part of a larger integrated vehicle.Driving execution across suppliers, shipyards, manufacturing partners, and internal cross-functional teams.Owning the design and integration of complex electromechanical systems across the vehicle lifecycle, from concept through productionDriving requirements definition, specifications, CAD design, hands-on prototyping, analysis (FEA, numerical modeling, hand calculations), validation, and production supportDesigning with manufacturability, serviceability, reliability, and real-world operating conditions in mindBuilding, testing, troubleshooting, and iterating on hardware in fast-moving development environmentsSupporting sea trials and in-field validation to verify system performance and resolve real-world issuesWorking closely with component suppliers, partner shipyards, manufacturing teams, and vessel operators to drive executionTraveling occasionally (~15%) to support testing, validation, suppliers, and field operationsMinimum Qualifications4+ years of experience owning complete mechanical or electromechanical systems from initial design through productionStrong fundamentals in structural and thermal engineeringFunctional knowledge of electrical systems, including high-voltage battery systems and power electronicsExperience designing large assemblies or complex multidisciplinary systemsExperience with CAD software such as NX, CATIA, or SolidWorksExperience with analysis and modeling tools such as MATLAB, Simulink, or FEA packagesStrong intuition for manufacturing methods and design-for-manufacturability principlesPractical experience designing, building, debugging, and troubleshooting hardware in production or prototype environmentsAbility to move quickly and make sound engineering decisions in ambiguous environmentsClear written and verbal communication skillsStrong time management and prioritization skillsComfortable working hands-on in the field, including on boats and at shipyardsBonus QualificationsExperience working on commercial vessels or marine systems, including familiarity with Coast Guard and ABS regulationsExperience with high voltage battery systemsExposure to sheet metal manufacturing, CNC machining, composites, or shop toolsExperience with fluid system design including pump sizing, heat exchanger sizing, and hose/pipe routingExperience creating detailed engineering drawings with strong GD&T fundamentalsComfortable pushing at a fast but sustainable paceEnthusiasm for boating, marine systems, and the waterAt 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 offerThe base salary for this role is P3: $150,000 P4: $180,000 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 visionParental leave — 14 weeks fully paid for birthing and non-birthing parentsGenerous time off — Highly competitive PTO with an opportunity to earn more time with tenureIncome protection — Life and disability insurance for all employeesRetirement savings — Traditional and Roth 401(k) accessWater fund — $500 for you to spend each year to get out on the water, however you chooseProfessional 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 safeCaptain training — Training and access to take Arcboats out with friends and familyOffice perks — Daily lunches, snacks, and good coffee while onsiteRelocation assistance — Available depending on role eligibility.Our ValuesWe move with urgency and build with care. We value these five things above all else:Ownership over both your work and the company's successEmpathy for colleagues and for customersHumility in problem solving and collaborationPragmatism 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.