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Mainspring Energy

Onsite linear generators for scalable power

Senior Mechanical Engineer - Electromechanical

Design EngineeringConfirmed live in the last 24 hours
Full-timeMenlo Park, CA, USA$140.3k - $165k /yrIn-person

About the Job

Requirements

  • A BS plus at least 5 years of experience or an MS plus at least 4 years of experience is required for the Senior level.
  • Proven experience owning electrical enclosure and/or cable design from initial design through launch is required.
  • Strong expertise in sheet metal design for medium-volume production, electrical component specification, mechanical design for electrical systems, and design-for-manufacturability challenges is required.
  • A solid understanding of electrical engineering principles and thermal modeling, and the ability to integrate them into larger system designs, is required.
  • Extensive experience with SolidWorks and PDM or a similar CAD version control system is required.
  • Candidates must be able to manage complex technical decisions, influence design direction, and coordinate with teams to achieve successful outcomes.

Responsibilities

  • Participate in brainstorming and technical review sessions to develop solutions that improve the performance and cost-efficiency of the Linear Generator and electrical subsystems.
  • Own the design, optimization, and execution of electrical hardware while balancing cost reduction, safety improvements, and system-level reliability.
  • Collaborate with reliability and test teams to validate systems and components, run fast iteration cycles, and incorporate feedback into next-generation Linear Generator deployments.
  • Collaborate with electrical engineering, manufacturing engineering, NPI, and external suppliers to deploy new designs into production and ensure performance and manufacturability requirements are met.
  • Develop electrical hardware through requirements development, prototyping, testing, iteration, and tooling, ensuring project milestones are met and resources are allocated effectively.

Desired Qualifications

  • Experience with CFD, FEA, and programs such as SolidWorks Flow Simulation or Ansys is a plus.

About the Company

Mainspring Energy

Onsite linear generators for scalable power

Mainspring Energy designs and ships onsite linear generators that produce electricity for commercial and industrial customers, data centers, utilities, and microgrids. The kit uses a straight-line motion that is converted into electric current by magnets moving through copper coils, driven by a flameless, low-temperature air-and-fuel reaction with only two moving parts and an oil-free air-bearing. The system is fuel-flexible, handling natural gas, biogas, hydrogen, ammonia, and propane, and it scales from about 250 kW to more than 100 MW, with near-zero NOx and no after-treatment required. The company sells power as a service, enabling installations with no upfront cost and ongoing payments based on energy use, aiming to lower operating costs and increase energy resilience for its customers.

Company size
501-1,000
Company stage
Series F
Total funding
$813M
Headquarters
Menlo Park, CA
Founded
2010

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