Senior Mechanical Engineer – Continuous Improvement for Mechanical Design

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 Cayalyst 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

Job Overview

Do you have a knack for design of complex mechanical systems? Have you ever invented a tool or changed a process just to make routine installation or service faster and easier? If you're driven by solving real-world design challenges, especially within state of the art mechanical power generation equipment, then this role is built for you.

Mainspring Energy is seeking a Continuous Improvement Engineer with a focus on mechanical design to lead product improvement efforts across our field and production systems. You will work on-site at a contract manufacturer, addressing design and manufacturing issues at their root. You will redesign critical components for durability and ease of service, integrate your findings back into the development process to ensure the long-term reliability and manufacturability of our products.  You will support manufacturing with a hands-on approach to solve complex mechanical problems working directly with the product to take measurement, perform testing, and support pilot efforts to develop rework/retrofit processes.

Core Responsibilities

• Lead the root cause analysis of mechanical failures using data from diagnostics, hands-on testing, and fundamental analysis of bolted joints or material fatigue life
• Redesign or re-engineer components, fasteners, or assemblies to eliminate failures, reduce costs, or improve serviceability
• Work closely with design engineering, manufacturing, and quality teams to ensure that changes are thoroughly tested and validated with short feedback cycles
• Collaborate with NPI, manufacturing quality, and supply chain teams to ensure solutions are optimized for production, vendor capabilities, and field service
• Predict and prevent failure modes by applying a deep understanding of mechanical system interactions, tolerance stack-ups, and real-world use conditions
• Implement feedback loops from field issues into design standards and engineering processes to continuously improve product quality and reduce recurrence
• Create and manage internal improvement systems that embed learnings into manufacturing process flow and future design development efforts
• Support the development of service tooling, testing fixtures, or diagnostic aids as needed for improved deployment and serviceability
• Travel to HQ in Menlo Park, CA required once per quarter

Qualifications

• BS or MS in Mechanical Engineering or a similar technical field, minimum BS + 2 years industrial design design experience
• Senior Level: BS + 6 years, or MS + 5 years in industry roles with a focus on mechanical design
• Hands-on experience with mechanical design, including analysis of bolted joints, stress analysis, and structural integrity
• Proven ability to use data-driven root cause analysis to solve complex, cross-functional design issues
• Experience addressing and resolving field and production issues
• Knowledge of DFM/DFA principles and quality system tools (PFMEA, 8D, CAPA, etc.)
• Deep understanding of tolerance stack-ups and the use of CMMs in inspection processes
• Familiar with manufacturing processes including tube swaging, crimping, potting, stamping, sheet metal, hydroforming, welding, machining, and fabrication
• Proficient in SolidWorks or a comparable CAD package; PDM experience preferred
• Experience with structural FEA and/or is a plus
• A passion for building robust, field-ready solutions with high reliability and serviceability

Why Join Us?

• Directly influence the reliability and field performance of mission-critical mechanical systems
• Collaborate with top-tier engineering teams in a fast-paced and supportive environment
• Be part of an innovation-driven company working on impactful technologies
• Competitive compensation and a full benefits package
• Opportunities for technical leadership and long-term growth

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.