Senior Mechanical Engineer - Electromechanical

Mainspringenergy; Edison (CA); On-site; USD 120,000 - 180,000; Full time

Job summary

Mainspring Energy is seeking Senior Mechanical Design Engineers with a focus on electrical enclosures and cables to advance our Linear Generator platform.

You will lead from requirements through design, testing, and release, collaborating across electrical, manufacturing, and reliability teams to deliver cost-effective, robust solutions.

Ideal candidates combine strong CAD skills, thermal modeling, and hands-on problem solving in a fast-paced, scalable energy tech environment.

Qualifications

• Ownership of electrical enclosure and/or cable design from concept to launch.
• Strong background in sheet metal design for medium-volume production.
• Experience with electrical systems and thermal modeling.
• Proven ability to lead cross-functional reviews and coordinate testing and release.

Responsibilities

• Lead design, optimization, and execution of electrical hardware to meet performance and manufacturability targets.
• Coordinate testing and cross-functional reviews to ensure milestones are met.
• Collaborate with reliability, test teams and external suppliers to deploy designs into production.
• Develop requirements, prototyping, testing, iteration and tooling for projects.

Skills

Electrical enclosure design

Cable design

SolidWorks

CFD/FEA

Sheet metal design

Thermal modeling

Cross-functional collaboration

Design-for-manufacturability

PDM

Education

BS or MS in Mechanical Engineering

Tools

SolidWorks

PDM

Job description

About Mainspring

Mainspring Energy manufactures and delivers fuel-flexible, low-emissions local power solutions that rapidly add new capacity and deliver reliable, affordable, and sustainable electric power. The company began commercial shipments of its Mainspring Linear Generators in 2020 and today has hundreds of megawatts in advanced development and field operations for leading Fortune 500 companies, data centers, and utilities. Mainspring also partners with global energy leaders including AEP, NextEra Energy Resources, Schneider Electric, and more.

core values that ground our work, guide our decisions, and connect us together:

• Pragmatic Optimism
• Excellence without Ego
• Proactive Collaboration

Job Overview

Mainspring is seeking Senior Mechanical Design Engineers with a focus on designing electrical enclosures and cables while improving functionality and system-level performance. In this role, you will lead projects from setting requirements, designing, conducting cross functional reviews, coordinating testing and release to ensure that key electrical subsystems meet challenging technical requirements with a potential for direct reports. Ideal candidates will have a strong combination of technical expertise and the drive to solve complex problems in a collaborative environment.

• Involved in brainstorming and technical review sessions to develop innovative solutions that enhance the performance and cost-efficiency of the Linear Generator and electrical subsystems
• Ownership of design, optimization, and execution of electrical hardware, balancing cost reduction, safety improvements, and system-level reliability
• Collaborate with reliability and test teams to validate systems and components, ensuring fast iteration cycles and incorporating feedback to drive the next-generation deployment of the Linear Generator
• Collaborate cross-functionally with electrical engineering, manufacturing engineering, NPI, and external suppliers to deploy new designs into production, ensuring all systems meet the necessary performance and manufacturability requirements
• Development of electrical hardware, including requirements development, prototyping, testing, iteration, and tooling, ensuring project milestones are met and resources are allocated effectively
• Degree: BS or MS in Mechanical Engineering or a similar engineering field from an accredited institution. Experience and degree will determine the level, with the following minimum requirements: Senior: BS + 8 years or MS + 6 years
• Proven experience taking ownership of electrical enclosure and/or cable design, from initial design to launch
• Strong expertise in sheet metal design for medium-volume production, electrical component specification, mechanical design for electrical systems, and design-for-manufacturability challenges
• A solid understanding of electrical engineering principles and thermal modeling, and the ability to integrate them effectively into larger system designs
• Extensive experience in SolidWorks and PDM (or a similar CAD version control system). Experience with CFD, FEA, and programs like SolidWorks Flow Simulation or Ansys is a plus
• Demonstrated ability to manage complex technical decisions, influence the direction of designs, and coordinate with teams to achieve successful outcomes
• Passion for creating innovative and cost-effective solutions to enable the large-scale deployment of zero-carbon energy technologies

Does your experience not meet all of our posted requirements? Studies have shown that some people are less likely to apply to positions unless they meet every listed requirement. At Mainspring, we are committed to building a diverse, inclusive, flexible, and collaborative environment, so if you want to help us transition the world to clean and affordable electricity, and don’t meet all posted requirements for a particular role, we’d still love to hear from you. Mainspring can sometimes be flexible enough to shift responsibilities for the right person, or otherwise identify open or upcoming roles that may better fit your professional background.

In more traditional words, Mainspring Energy, Inc is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.

This compensation and benefits information is based on Mainspring Energy's estimate as of the date of publication and may be modified in the future. We generally do not negotiate on salary once we have made an offer. The level of pay within the range will depend on a variety of job-related factors that may include location, relevant prior experience and/or education, or particular skills and expertise. New hires joining the company tend to be paid within the starting base pay range noted above, with opportunities to increase pay over time based on development of additional skills, competencies, and company-specific knowledge.