Senior Mechanical Engineer - Exhaust System

Company Overview

Mainspring Energy is revolutionizing power generation with the world’s most flexible and adaptable local power generation technology, the Mainspring Linear Generator. Commercial, industrial, and utility leaders are choosing Mainspring over traditional options like engines, turbines, and fuel cells to quickly and reliably deliver local power for EV charging, commercial facilities, data centers, and grid-scale operations. The Mainspring Linear Generator is fuel flexible, ramps up and down to meet demand, and utilizes a flameless reaction with near-zero NOx emissions.

Backed by top-tier investors including Khosla Ventures, Bill Gates, American Electric Power, Lightrock, and General Catalyst Mainspring designs, manufactures and delivers its products to customers across the U.S. today, and we’re quickly scaling for international expansion.

Inspired by our vision of the affordable, reliable, net-zero carbon grid, Mainspring is rapidly expanding within the $816B global electricity equipment market, and we’re hiring the best talent to meet growing customer demand around the globe. We welcome a broad range of backgrounds, experiences, and talents to bring fresh perspectives and ongoing innovation to our customers.

We are looking to build relationships with people who share our values:

Pragmatic Optimism.

Building a new category of world-class power generation requires the optimism of ambition and creativity, balanced with practicality to solve problems efficiently. The challenges that arise are opportunities for growth.

Excellence without Ego.

We bring expertise and commitment to creating the best customer experience, from sales to deployment and service, just as we apply deep technical rigor to building and delivering world-class products. We strive for excellence and behave as leaders with the humility to acknowledge our challenges, both collectively and as individual contributors.

Proactive Collaboration.

The integration and cross-disciplinary nature of Mainspring’s business requires intentionally seeking out others who bring different skills, perspectives, and priorities. Our culture of inclusion and respect extends beyond our team to interactions with our partners and customers.

More information can be found at

www.mainspringenergy.com

Job Overview

Are you passionate about using your engineering skills to combat climate change? Mainspring Energy is looking for a creative and driven Senior Mechanical Engineer to help us perfect a key component of our groundbreaking Linear Generator: the exhaust system. This is more than just a job; it's a chance to solve complex challenges in performance, acoustics, and structural design, all while helping to build a cleaner, more sustainable energy future. If you're excited by hands-on work and want to make a tangible impact, we want to hear from you.

Responsibilities

- Design for a Better World:

Play a vital role in the entire design lifecycle of our low-emission exhaust subsystems. You'll take ideas from concept and analysis (FEA/CFD) to 3D modeling (Solidworks), prototyping, and validation testing.

- Solve Tough Challenges:

Tackle fascinating engineering problems unique to exhaust systems, from selecting materials that withstand extreme temperatures to designing for durability in high-vibration environments and integrating emissions control and acoustic-damping technologies.

- Collaborate and Innovate:

Work closely with a brilliant cross-functional team of engineers to integrate your designs and bring our next-generation products to life, contributing to a culture of continuous improvement.

- Validate and Perfect:

Plan and execute rigorous testing to ensure your designs are robust, reliable, and ready to perform in the real world, meeting demanding requirements for performance, safety, and durability.

- Grow Your Skills:

Stay at the forefront of mechanical engineering for clean power generation, continuously learning and identifying new opportunities to make our technology more efficient and cost-effective.

Qualifications

- A background in designing systems that operate in

high-temperature and high-vibration environments

.

- Solid engineering fundamentals in

thermo-fluid systems and structural mechanics

.

- An understanding of how to design for

durability, fatigue, and long-term reliability

.

- Proficiency with a 3D CAD package (we use Solidworks) and creating engineering drawings (GD&T).

- Knowledge of common manufacturing processes like sheet metal fabrication, welding, and casting.

- Hands-on experience with prototyping, assembling, and testing hardware.

- Familiarity with analysis tools (FEA, CFD) to guide your design decisions.

- Exposure to acoustic or emissions control hardware is a great plus!

What You Bring to the Table:

- A degree in Mechanical Engineering or a related field.

- A strong background in mechanical design, typically demonstrated by 5+ years of professional experience. We're more interested in your skills and passion than a specific number.

- Experience taking designs from the drawing board to reality, preferably with complex hardware projects in fields like power generation, industrial equipment, or automotive systems.

- A natural curiosity and a drive to build, test, and create innovative solutions.

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.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

This position is 

onsite

at our Menlo Park HQ. The salary will be adjusted to reflect local market conditions based on employee location as well as the experience of the employee. Along with the base salary, Mainspring offers pre-IPO stock options + benefits.