Mechanical Engineer

Stafl Systems•South San Francisco, CA

73d•Hybrid

About The Position

We are looking for a motivated Mechanical Engineer who thrives on rapid iteration. We move with the speed and autonomy of a startup to bring next-generation battery technologies to market. In this role, you will work cross-functionally with our in-house teams to develop the next generation of battery and powertrain technologies for high-performance mobility and consumer applications. You will take on project ownership and design high-quality mechanical systems across a diverse product portfolio. Your impact will span the entire development lifecycle—from initial CAD design and simulation to rigorous validation testing, prototyping, and manufacturing bring-up. The ideal candidate values precision, thrives on technical challenges, and possesses excellent communication skills to bridge the gap between complex engineering and cross-functional execution.

Requirements

2+ years of mechanical engineering experience, ideally involving battery technologies.
Hands-on experience with rapid-prototyping to create functional jigs and fixtures.
Experience designing for CNC Machining, Injection Molding, Sheet Metal, and 3D Printing.
Familiarity with laser welding and IP67 sealing methods.
Ability to clearly communicate technical issues in succinct language to non-technical teammates.
BS, MS, or MEng in Mechanical Engineering.

Nice To Haves

Experience designing for consumer products, e-mobility, automotive, or aerospace applications.
Experience with manufacturing bring-up, both in-house and with external contract manufacturers (CMs).
Familiarity with PDM and PLM systems for revision control.
Knowledge of safety and transport standards (UN 38.3, UL 2580, UL 2271).
A demonstrated ownership mindset and the ability to thrive in ambiguity and fast-paced environments.

Responsibilities

Design and model mechanical components and assemblies using SolidWorks CAD and PDM.
Execute structural, thermal, and fluid simulations, correlating digital results to physical testing.
Develop and execute test plans and design validation methods for battery system failure modes.
Perform trade-off analyses and DOEs to optimize designs for performance and cost.
Lead prototype builds and support manufacturing bring-up for new product lines.
Collaborate with interdisciplinary teams (Electrical, Software, Systems) to deliver high-confidence products.

Benefits

Health, Dental, Vision, and Life Insurance, with 99% of premiums covered by the company.
4 weeks of fully paid parental leave.
Competitive Compensation: Base salary plus an equity award.
401(k) Plan: Employer match up to 5%.
3 weeks of accrued vacation and 2 weeks of accrued sick leave.
Paid holidays in accordance with the company schedule.
Unpaid personal leave options.
Bereavement Leave: 1 week fully paid.
Jury Duty Leave: Up to 1 week fully paid.
PTO Nomination Program.
Annual training budget for professional development.
Safety Shoe Stipend.
Team Outing Program.
Social Calendar: Weekly, monthly, and seasonal team-building events.
Catered team lunches plus a kitchen fully stocked with snacks and beverages daily.
Uber Business access, free on-site EV charging, and more.