Senior Mechanical Engineer, Exhaust System

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.

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.

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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.

• 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.

• A background in designing systems that operate in high‑temperature and high‑vibration environments
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• Solid engineering fundamentals in thermo‑fluid systems and structural mechanics
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• An understanding of how to design for durability, fatigue, and long‑term…