Staff Mechanical Engineer — Battery Pack Design Lead

Energy Jobline ZR; Menlo Park (CA); On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Restricted Stock Units (RSUs)

Benefits package

Job summary

Mainspring Energy is seeking a Staff Mechanical Engineer – Battery Design to lead battery pack and module development for current and future energy platforms. You will define architectures, partner with suppliers, and drive safety, reliability, and cost outcomes across integration and production.

The ideal candidate has deep lithium-ion battery experience, strong supplier-management skills, and will work onsite at the Menlo Park HQ, collaborating across mechanical, electrical, and battery

Qualifications

• 10+ years of engineering experience focused on lithium-ion battery pack/module design
• Deep understanding of battery pack/module architecture
• Experience with battery suppliers and contract manufacturers
• Knowledge of cell integration, interconnect design, and battery protection systems
• Experience with UL certification of battery systems

Responsibilities

• Lead battery pack and module design as technical lead.
• Collaborate with suppliers to review and influence pack/module architectures.
• Own battery hardware from requirements to production launch and sustaining engineering.
• Evaluate designs for safety, reliability, manufacturability, thermal performance, lifecycle and cost.
• Lead design reviews for cell integration, interconnects, thermal solutions, and safety features.
• Support supplier selection, design reviews, validation activities, and manufacturing readiness.
• Develop architectures for future generator platforms.
• Coordinate with Electrical, BMS, Reliability, Manufacturing, Test, NPI, and Supply Chain teams.
• Lead root-cause investigations for production, test, and field issues.
• Travel to supplier sites as needed.

Skills

Battery design experience

Cell integration & interconnect design

Supplier management

Thermal management understanding

Validation & manufacturing readiness

Root-cause analysis

Education

BS or MS in Mechanical Engineering or related discipline

Tools

SolidWorks

PLM systems

Job description

Mainspring Energy is seeking a Staff Mechanical Engineer – Battery Design to lead battery pack and module development for current and future energy platforms. You will define architectures, partner with suppliers, and drive safety, reliability, and cost outcomes across integration and production.

The ideal candidate has deep lithium-ion battery experience, strong supplier-management skills, and will work onsite at the Menlo Park HQ, collaborating across mechanical, electrical, and battery