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

Are you an experienced engineer ready to lead critical projects that will accelerate the transition to a sustainable energy grid? Mainspring Energy is seeking a visionary Staff Mechanical Engineer to spearhead the design and development of the exhaust system for our revolutionary Linear Generator technology. This is a high‑impact role where you will use your deep technical expertise to solve complex challenges in performance, acoustics, and structural dynamics.

If you're a leader who loves to mentor, innovate, and drive projects from architecture to production, join us in making a significant contribution to a cleaner world.

• Architect and Lead: Own the technical vision and development lifecycle for our low‑emission exhaust subsystems. You'll guide architectural decisions, lead advanced design and analysis (FEA/CFD), and drive projects from concept to completion.
• Pioneer New Solutions: Drive innovation in our exhaust system technology. You'll develop creative solutions for extreme temperature materials, robust strategies for vibration and durability, and novel techniques for acoustic silencing and emissions control.
• Mentor and Guide: Lead and inspire a talented, cross‑functional team, mentoring junior engineers and defining best practices. You'll foster a collaborative environment to optimize system integration and performance.
• Define and Validate: Architect and execute comprehensive validation campaigns to ensure your designs exceed the highest standards for performance, reliability, and safety in the most demanding conditions.
• Shape Our Technology
  
  Roadmap:
  
  Stay on the cutting edge of power generation and exhaust system technology, championing new ideas and strategies that enhance performance, reduce cost, and increase reliability for our clean energy solution.

• Deep expertise in designing for high‑temperature and high‑vibration environments an…