Staff Mechanical Engineer - Onsite Hardware for Clean Power

Mainspring Energy; Menlo Park (CA); On-site; USD 90,000 - 130,000; Full time

Job summary

Mainspring Energy, headquartered in Menlo Park, CA, is seeking a Mechanical Engineer to own defined-scope mechanical tasks for the Linear Generator platform. You will design hardware, support analysis and testing, and drive work to validation and release with cross‑functional teams.

The ideal candidate has hands-on design, analysis, testing, and iteration experience, strong fundamentals, and the ability to communicate clearly in a technical environment.

Qualifications

• BS or MS in Mechanical Engineering or a similar field with demonstrated design experience.
• Experience designing, analyzing, testing, and iterating mechanical hardware through multiple project cycles.
• Ability to independently own defined-scope engineering work and deliver clear results.

Responsibilities

• Own defined-scope mechanical engineering tasks and moderate-complexity projects.
• Design moderately complex parts, assemblies, fixtures, or subsystems with manufacturability and reliability in mind.
• Use calculations, tests, data, and troubleshooting to validate designs and guide improvements.
• Develop and execute test plans, document findings, and support release decisions.
• Collaborate cross-functionally with engineering, manufacturing, quality, supply chain, and service teams.

Skills

Mechanical design

Engineering calculations

Clear communication

Test experience

Education

BS/MS in Mechanical Engineering

Tools

SolidWorks

PLM systems

Job description

Mainspring Energy, headquartered in Menlo Park, CA, is seeking a Mechanical Engineer to own defined-scope mechanical tasks for the Linear Generator platform. You will design hardware, support analysis and testing, and drive work to validation and release with cross‑functional teams.

The ideal candidate has hands-on design, analysis, testing, and iteration experience, strong fundamentals, and the ability to communicate clearly in a technical environment.