# Mechanical Engineer at Mainspring Energy

- Company: Mainspring Energy
- What the company does: Local power generation for data centers, utilities, industrial & enterprise applications. Fuel-flexible, fast to deploy, high-efficiency, low NOx power. Backed by General Catalyst and Khosla.
- Company website: https://www.mainspringenergy.com/
- Type: Startups
- Level: Mid level
- Location: Menlo Park, CA
- Work setup: On-site
- Pay: $119K to $140K base salary per year (USD)
- Posted: 2026-08-06
- Apply by: 2026-10-08
- Apply: https://jobs.lever.co/mainspringenergy/2d692a17-b471-4078-a606-802662c5f1bc
- Page: https://www.1752.vc/careers/jobs/mainspring-energy-mechanical-engineer/

## About the role

Mainspring is seeking a Mechanical Engineer to own defined-scope mechanical engineering tasks, workstreams, or moderate-complexity projects for our Linear Generator platform. In this role, you will design mechanical hardware, support analysis and testing, drive assigned work through validation and release, and work cross-functionally with engineering, manufacturing, quality, supply chain, test, and service teams.

## What they're looking for

- BS or MS in Mechanical Engineering or a similar engineering field, with demonstrated experience contributing to mechanical design work beyond purely academic projects
- Experience designing, analyzing, testing, and iterating mechanical hardware through multiple project phases or design cycles
- Ability to independently own defined-scope engineering work with clear deliverables, while seeking guidance for ambiguous, complex, or high-risk decisions
- Strong mechanical fundamentals, including practical experience with parts, assemblies, fixtures, mechanisms, structures, thermal systems, fluid systems, electromechanical packaging, or other relevant mechanical systems
- Demonstrated ability to use analysis, testing, data, and engineering judgment to evaluate designs, compare options, and recommend practical next steps
- Clear communication and execution skills, including the ability to document assumptions, decisions, risks, test results, and project status for technical and cross-functional stakeholders

Tags: Mechanical and Structural Systems