Senior Mechanical Engineer - Powertrain Engineering

Arc Boats•Torrance, CA

3d•Onsite

About The Position

Arc is on a mission to electrify the marine industry by rethinking powertrains, software, and vessel designs. The company has proven its technology with consumers and is now scaling production and extending its platform to commercial applications, including tugs, ferries, and defense. Arc has signed contracts and a pipeline across various vessel types. The Senior Mechanical Engineer will own the design and integration of complex electromechanical systems throughout the full vehicle lifecycle, from concept and requirements through prototyping, validation, sea trials, and production. This role is full-time, on-site at the Los Angeles headquarters, reporting to the Manager of Powertrain Hardware Engineering.

Requirements

Bachelor’s degree in Mechanical Engineering or related Engineering field
5+ years of experience owning complete mechanical or electromechanical systems, including large assemblies or complex multidisciplinary systems, from initial design through production
Functional knowledge of electrical systems, including high-voltage battery systems and power electronics
Strong fundamentals in structural and thermal engineering
Experience with CAD software such as NX, CATIA, or SolidWorks
Experience with analysis and modeling tools such as MATLAB, Simulink, or FEA packages
Strong intuition for manufacturing methods and design-for-manufacturability (DFM) principles
Practical experience designing, building, debugging, and troubleshooting hardware in production or prototype environments
Ability to move quickly and make sound engineering decisions in ambiguous environments
Clear written and verbal communication skills
Strong time management and prioritization skills
Comfortable working hands-on in the field, including on boats and at shipyards

Nice To Haves

Experience working on commercial vessels or marine systems, including familiarity with Coast Guard and ABS regulations
Experience with fluid system design, including pump sizing, heat exchanger sizing, and hose/pipe routing
Deep experience with high-voltage battery system design or integration (beyond general functional knowledge)
Exposure to sheet metal manufacturing, CNC machining, composites, or shop tools
Experience creating detailed engineering drawings with strong GD&T fundamentals
Comfortable pushing at a fast but sustainable pace
Enthusiasm for boating, marine systems, and the water

Responsibilities

Owning the design and integration of complex electromechanical systems across the vehicle lifecycle, from concept through production
Working across mechanical, electrical, thermal, and manufacturing domains
Understanding how assemblies, subsystems, and components interact as part of a larger integrated vehicle
Driving requirements definition, specifications, CAD design, hands-on prototyping, analysis (FEA, numerical modeling, hand calculations), validation, and production support
Designing with manufacturability, serviceability, reliability, and real-world operating conditions in mind
Building, testing, troubleshooting, and iterating on hardware in fast-moving development environments
Working closely with component suppliers, partner shipyards, manufacturing teams, and vessel operators to drive execution
Supporting sea trials and in-field validation to verify system performance and resolve real-world issues
Traveling occasionally (~15%) to support testing, validation, suppliers, and field operations

Benefits

Highly competitive equity grants
Semi-annual bonuses tied to impact
99% employer-paid medical, dental, and vision
14 weeks fully paid parental leave for birthing and non-birthing parents
Generous time off (Highly competitive PTO with opportunity to earn more with tenure)
Life and disability insurance
Traditional and Roth 401(k) access
$500 annual reimbursement for water activities ('Water fund')
$500 annual reimbursement for professional development
Monthly AI stipend
Annual reimbursement for PPE, ergonomic equipment, and safety support
Captain training and access to take Arcboats out
Daily lunches, snacks, and coffee while onsite
Relocation assistance (depending on role eligibility)