Senior Mechanical Engineer
Stafl Systems•South San Francisco, CA
•Onsite
About The Position
This role is instrumental in the design, simulation, analysis, and testing of mechanical components for state-of-the-art electric vehicle powertrains. You will be hands-on across the entire product lifecycle—from initial concept to New Product Introduction (NPI). The ideal candidate possesses a robust understanding of mechanical engineering fundamentals, thrives on bringing theoretical designs to life, and is enthusiastic about pioneering innovative EV technology. You will serve as a technical anchor, providing guidance on complex mechanical challenges and ensuring design integrity across the powertrain architecture.
Requirements
- 5+ years of mechanical engineering experience, with a focus on multi-cell battery systems or high-voltage applications.
- A proven history of taking projects from concept through development, test, and certification into production.
- Proficiency in rapid-prototyping to create functional jigs and fixtures.
- Design experience using manufacturing methods such as; CNC Machining, Injection Molding, Sheet Metal Bending, 3D Printing.
- Joining methods, such as ultrasonic welding, wire bonding, laser welding, TIG, MIG, IP67 sealing methods.
- Experience evaluating and managing relationships with CMs and suppliers, including performing source inspections.
- Ability to review technical work and provide actionable feedback to team members.
- Ability to clearly communicate technical issues in succinct language with non-technical team members and stakeholders.
- BS, MS, or MEng in Mechanical Engineering.
Nice To Haves
- A strong sense of ownership and the ability to thrive in a fast-paced, rapidly changing environment.
- Familiarity with aerospace or automotive safety certification standards.
- Experience managing technical data and revision control within PDM/PLM environments (e.g., SolidWorks PDM, Arena, or Teamcenter).
- Hands-on experience with high-voltage safety and battery management systems.
- Demonstrated knowledge in manufacturing processes.
Responsibilities
- Lead all aspects of design, validation, and manufacturing for EV battery systems across aircraft, off-road, and marine applications.
- Evaluate new manufacturing technology and equipment to enable scaling and continuous improvement of in-house battery production.
- Develop test plans and design validation methods for battery system failure modes.
- Perform trade off analysis and DOEs to optimize designs for performance and cost.
- Manage part and assembly lifecycles using SolidWorks CAD and PDM.
- Execute structural, thermal, and fluid simulations (SimScale), correlating digital results with physical testing.
- Collaborate with interdisciplinary teams electrical, software, systems, and project management team to deliver high confidence products.
Benefits
- Comprehensive Benefits: Health, Dental, Vision, and Life Insurance, with 99% of premiums covered by the company.
- Paid Parental Leave: 4 weeks of fully paid leave to support your growing family.
- Competitive Compensation: Base salary plus an equity award.
- 401(k) Plan: Employer match up to 5% to help you save for the future.
- Vacation & Sick Leave: 3 weeks of accrued vacation and 2 weeks of accrued sick leave.
- Company Holidays: Paid holidays in accordance with the company schedule.
- Flexible Leave: Unpaid personal leave options are available when you need them.
- Bereavement Leave: 1 week fully paid.
- Jury Duty Leave: Up to 1 week fully paid.
- PTO Nomination Program: Recognize and reward your teammates with additional time off.
- Professional Development: Annual training budget to support your career growth.
- Safety Shoe Stipend: Company-provided support for required safety gear.
- Collaborative Environment: We operate primarily on-site to foster fast-paced collaboration and execution. Hybrid flexibility may be available after an introductory period, depending on business needs.
- Team Outing Program: Department events including a half-day off and a company-sponsored allowance.
- Social Calendar: Weekly, monthly, and seasonal team-building events.
- Fuel Your Day: Regular catered team lunches plus a kitchen fully stocked with snacks and beverages weekly.
- Travel & Charging: Uber Business access, free on-site EV charging, and more.
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What This Job Offers
Job Type
Full-time
Career Level
Mid Level
