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About Mainspring
Mainspring Energy manufactures and delivers fuel-flexible, low-emissions local power solutions that rapidly add new capacity and deliver reliable, affordable, and sustainable electric power. The company began commercial shipments of its Mainspring Linear Generators in 2020 and today has hundreds of megawatts in advanced development and field operations for leading Fortune 500 companies, data centers, and utilities. Mainspring also partners with global energy leaders including AEP, NextEra Energy Resources, Schneider Electric, and more.
The core values that ground our work, guide our decisions, and connect us together:

• Pragmatic Optimism
• Excellence without Ego
• Proactive Collaboration

About the Role
Are you a systems-level thinker who thrives on untangling complex hardware mysteries? Do you prefer the thrill of deeply investigating and solving structured, multi-domain problems over routine schematic drafting? Mainspring Energy is looking for a highly autonomous, intellectually curious Senior Electrical Systems & Sustaining Engineer to anchor a brand-new sub-team within our Electrical Engineering (EE) organization. Unlike traditional sustaining roles confined to component obsolescence paperwork, this is a high-visibility engineering position built for an organizational anchor and leader. As the inaugural member of this sub-team, you will have the execution autonomy to establish the foundational sustaining framework for the entire EE department, creating a blueprint for the team's future expansion.
Job Overview
At Mainspring, we are pioneering a new category of fuel-flexible power generation to enable a clean, reliable, and affordable electric grid. As we scale production and rapidly expand our commercial fleet, maintaining flawless hardware integrity is vital to our mission. In this role, you will step in as the technical execution lead for problem resolution across all electrical domains-spanning from low-voltage electronics to complex power conversion systems-acting as the operational shield for our core design groups. This position is ideal for an electrical expert who enjoys working on complex systems and has a keen eye for detail.
Responsibilities

• CAPA Leadership & Escalation Ownership: Serve as the single point of contact for all EE Corrective and Preventive Action (CAPA) issues. Take charge of investigating fleet issues, establishing immediate containment paths, and driving permanent resolutions
• Hands-on Lab Diagnostic Validation: Conduct intensive hands-on electrical lab bench testing to reproduce fleet and manufacturing anomalies. Utilize standard laboratory diagnostic equipment (oscilloscopes, digital multimeters, power supplies, logic analyzers, and electronic loads) to validate containment strategies and prove out root-cause theories
• Root Cause & Failure Analysis: Lead end-to-end problem resolution spanning from initial telemetry data parsing to deep-dive root cause analysis. Partner closely with our internal Failure Analysis (FA) experts to diagnose complex electronics and hardware system failures
• Design Ownership for Reliability: Directly drive the continuous improvement of our deployed hardware ecosystem. You will have the technical authority to own and execute the engineering change lifecycle-from designing and releasing targeted PCBA revisions to identifying, testing, and qualifying strategic off-the-shelf (OTS) components-to permanently eliminate failure modes and improve system performance
• Cross-Functional Tiger Team Representative: Act as the authoritative EE voice on the cross-functional CAPA Tiger Team. Interface daily with Core Reliability, Mechanical, Software, and Manufacturing teams to ensure a unified approach to system-level reliability
• Technical Triage & Strategy: Function as the primary gatekeeper for incoming electrical engineering challenges. For specialized issues, triage, prioritize, and collaboratively map out resolution strategies with design specialists across the EE department
• Metrics & Infrastructure Management: Own and optimize the EE Atlassian/Jira Problem dashboard. Systematically track, analyze, and report on key performance indicators (e.g., Mean-Time-Between-Swaps/MTBSwap) to demonstrably reduce field failure rates and eBox replacements
• Technical Knowledge Capture & Standards: Author comprehensive failure analysis reports, root-cause whitepapers, and standardized electrical triage workflows. You will turn deep-dive technical findings into institutional knowledge, creating the foundational documentation required to scale this sub-team and uplevel the broader engineering organization

Qualifications

• 5+ years of experience with a Bachelor's degree, or 4+ years of experience with a Master's degree, in Electrical Engineering or a related field. This background must be in an Electrical, Product, or Reliability Engineering capacity with a clear track record of owning complex circuit/schematic analysis, physics-based root-cause investigations, and the full engineering change (EC) design lifecycle
• Technical Acumen: Strong foundational expertise in complex electronics and hardware systems (preference for broad mechatronics/electronics experience over purely facility power systems)
• Hands-on Lab Experience: Proven competency in a physical hardware lab environment setting up test benches, instrumenting hardware under test, and maintaining clean, safe laboratory testing practices
• Problem-Solving DNA: A genuine passion for hardware debugging and structured root-cause failure analysis (e.g., 8D, 5 Why, Fishbone diagrams) on complex physical systems. You are not satisfied with the first layer of failure and have a tenacity towards finding the true root cause
• Design Ownership for Reliability: Directly drive the continuous improvement of our deployed hardware ecosystem. You will have the technical authority to own and execute the engineering change lifecycle-from designing and releasing targeted PCBA revisions to identifying, testing, and qualifying strategic off-the-shelf (OTS) components-to permanently eliminate failure modes and elevate system robustness
• Systems-Level Perspective: The ability to zoom out and understand complex interdependencies across circuitry, firmware, manufacturing and mechanical wear mechanisms within a massive multi-domain machine
• Cultural Alignment: Embody Mainspring's foundational pillars on a daily basis: bring Pragmatic Optimism to highly complex engineering challenges, exercise Excellence without Ego when collecting or delivering rigorous technical feedback, and drive Proactive Collaboration across separate team boundaries

Preferred Qualifications

• Full Hardware Lifecycle Exposure: Experience navigating the full hardware development life cycle-from initial requirements gathering and schematic capture through manufacturing optimization and sustaining field support
• Process Discipline & Tools: Prior experience working within formal CAPA structures, quality management frameworks, and bug/incident tracking ecosystems (e.g., Jira, Confluence)
• Fast-Paced Environments: Prior experience working within a startup, rapid product development environment, or a scaling hardware company where agility and self-direction are mandatory
• ECAD Tools: Proficiency with professional ECAD software layout and schematic design tools, preferably Altium Designer
• Software & Scripting: Familiarity with the Python for data parsing, automated test script creation, or querying hardware telemetry logs
• Modern Version Control: Experience utilizing Git-based version control workflows (GitHub or GitLab) for tracking hardware code, scripts, or engineering documentation

$130,050 - $153,000 a year
This is a hybrid position (onsite + remote) and will require you to be onsite as required to perform testing, troubleshooting, manufacturing support, etc. 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.
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 and identifying potential inconsistencies or verification signals in application materials based on available information. 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.