Mechanical Engineer III – Battery Systems Engineering
Proper Voltage•Carlsbad, CA
•$130,000 - $165,000
About The Position
We're looking for an experienced mechanical engineer to take ownership of battery pack and module design from concept through production. This is a senior individual-contributor role: you'll drive design decisions independently, lead thermal and structural analysis efforts, and mentor junior engineers, while working closely with electrical, controls, and manufacturing teams to ship real hardware. Deep experience with thermal analysis and simulation is strongly preferred. We run active thermal test campaigns and simulation workflows, and this role owns that work rather than just supporting it.
Requirements
- Bachelor's degree in Mechanical Engineering or closely related discipline
- 5+ years of professional mechanical engineering experience, ideally in battery, EV, or energy storage hardware
- Demonstrated track record taking designs from concept through production
- Expert-level 3D CAD skills (Onshape, SolidWorks, or equivalent)
- Strong command of GD&T, tolerance stack-up analysis, and DFM principles
- Experience owning mechanical subsystems independently, with minimal oversight
- Ability to mentor junior engineers and lead design review discussions
Nice To Haves
- Proficiency with FEA or CFD tools (SimScale, ANSYS, SolidWorks Simulation) for thermal and structural analysis
- Direct experience with battery-powered devices, EV systems, or energy storage products
- Hands-on experience with manufacturing processes — machining, sheet metal, plastics, assembly
- Working knowledge of UN 38.3 or UL safety standards
- Experience leading a physical prototype build from CAD through assembled hardware
- Prior experience mentoring or informally leading other engineers
Responsibilities
- Own mechanical design of battery modules and packs end-to-end, including: Cell integration concepts (prismatic, cylindrical, or pouch formats), Structural components, brackets, and enclosure design, Busbar and interconnect geometry
- Drive design reviews, tolerance stack-up analysis, and DFM decisions
- Define mechanical interfaces across the assembly and negotiate trade-offs with electrical and controls teams
- Make final calls on design trade-offs balancing performance, cost, and manufacturability
- Own thermal simulation setup, execution, and post-processing (SimScale, ANSYS, or equivalent)
- Evaluate and select TIM and interface materials based on performance and cost trade-offs
- Design and run thermal test campaigns; independently analyze discharge data and identify root causes of thermal issues
- Correlate simulation outputs to physical test results and refine models accordingly
- Define and lead mechanical validation test plans, vibration, drop, thermal cycling
- Own root cause analysis on test findings and drive corrective actions to closure
- Review and approve test reports and documentation from junior engineers
- Maintain CAD revision history and BOM structure for your subsystems
- Author engineering documentation, test procedures, and work instructions
- Lead design review discussions and drive action items to closure
- Mentor Mechanical Engineer I/II staff on CAD practices, GD&T, and design fundamentals
Benefits
- Equity participation as part of total compensation
- Comprehensive healthcare benefits (medical, dental, vision)
- Paid time off and company holidays
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What This Job Offers
Job Type
Full-time
Career Level
Senior
