Embedded Software Engineer

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. 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

At Mainspring Energy, we’re redefining how distributed power systems are designed, built, and operated. As a Staff Embedded Software Engineer, you’ll develop the low‑level intelligence that drives our next‑generation energy systems—bridging hardware, firmware, and cloud interfaces in an environment where milliseconds and microvolts matter.

This is not just another embedded role. You’ll work on complex, multidisciplinary systems—real hardware, real‑time constraints, and real‑world impact. You’ll be part of a highly collaborative team that values innovation, craftsmanship, and curiosity.

• Design and implement embedded software in C, C++, and Python for control, monitoring, and communications across a growing family of sensors, actuators, and controllers
• Architect next‑generation embedded platforms, shaping the evolution of our system from the kernel level to high‑level application logic
• Invent and refine communication protocols for our custom in‑house I/O devices—where reliability and performance are non‑negotiable
• Collaborate deeply with Electrical and Controls teams to bring new hardware to life, from early prototypes to production systems
• Lead and mentor other engineers, cultivating a culture of technical excellence and curiosity
• Develop simulation, testing, and CI pipelines, ensuring code quality and rapid iteration in a hardware‑centric environment
• Select and integrate compute hardware, balancing real‑time performance, scalability, and cost
• Shape our software culture, contributing to best practices, process definition, and architecture decisions that scale with our ambitions

• Week 1:
  You’ll fix your first issue and review a colleague’s merge request
• Month 1:
  You’ll deliver your first driver for a new hardware module
• Year 1:
  You’ll play a key role in designing our next‑generation embedded architecture that unlocks future products and features