Senior / Lead Mechanical Engineer

Visa Sponsorship: Please note that we are unable to provide visa sponsorship for this position.

Proper Voltage is the universal integration layer between advanced batteries and real products. We remove the complexity of voltage mismatch, chemistry limitations, and integration delays that have historically locked product teams into suboptimal power solutions.

Our Battery Operating System (bOS) makes advanced chemistries like sodium-ion, LTO, and lithium-sulfur plug-and-play with existing products, no redesign required. This means better safety, performance, and efficiency with zero product compromises.

Instead of a BMS or chemistry startup, we're the system that bridges the gap between breakthrough power technologies and the products that need them most.

Power should be a design advantage, not a limitation. Join us in making advanced batteries universally accessible.

Job Overview:

We are hiring a Senior Mechanical Engineer to help design, validate, and deliver our next generation of battery systems from concept through commercial deployment.

This role involves strong ownership, autonomy, and technical depth on projects across their full lifecycle, including CAD development, validation testing, supplier coordination, and on-site builds.

You will collaborate closely with senior leaders and cross-functional teams to ensure mechanical systems meet performance, manufacturability, and reliability standards.

This is an in-office role based at our Carlsbad, CA headquarters.

Responsibilities

• Design and develop mechanical components and assemblies for energy storage and power electronics systems
• Drive commercial product development including prototype builds, test planning, and design documentation
• Work to transition designs from prototype to production, including documentation, BOM cleanup, and supplier handoff
• Perform root cause analysis and corrective actions during testing and early deployment
• Collaborate with electrical and embedded systems engineers to ensure system-level integration
• Conduct design reviews, DFM assessments, tolerance stackups, and basic thermal and structural evaluations
• Work with vendors on rapid prototyping, mechanical fabrication, and component sourcing
• Participate in lab-based testing of thermal, vibration, and environmental conditions
• Willingness to support key deadlines outside of normal working hours
  
  
  

Required Qualifications

• Bachelor’s degree in Mechanical Engineering or a related field
• 5+ years of mechanical design experience in hardware or electro-mechanical product development
• Expert in SolidWorks or equivalent CAD tools, with clear mechanical drawings and GD&T
• Hands-on experience with DFM, rapid prototyping, machining, injection molding, or sheet metal
• Strong verbal and written communication skills
• Ability to work in full-time in Carlsbad, CA office
  
  
  

Preferred Qualifications

• Experience designing products for environmental robustness (e.g., IP-rated enclosures)
• Familiarity with PCB integration, thermal management strategies, and EMI shielding
• Knowledge of simulation tools (thermal, mechanical, or vibration)
• Startup or early-stage development experience
  
  
  

Compensation & Benefits

• Salary range: $110,000 - $140-000 based on experience and qualifications.
• Equity options as part of the compensation package
• Comprehensive healthcare benefits (medical, dental, vision)
• Generous paid time off and paid holidays (PTO) policy
  
  
  

Join us in reimagining the relationship between power and products, and help build a more sustainable, efficient future where any product can access the best battery technology available.

Proper Voltage is an equal opportunity employer and prohibits discrimination and harassment of any kind without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression or any other characteristic protected by federal, state or local laws or our own sensibilities.