Jobs at Mainspring Energy

Mainspring Energy is seeking an Inventory Associate for their Menlo Park, California facility. This role involves managing inventory, including receiving, organizing, and tracking parts and kits for internal customers in Operations, Maintenance, R&D, and Contract Manufacturing. Responsibilities include data entry, cycle counts, and inspecting deliveries.

Mainspring Energy is seeking a Senior Commissioning Operations Technician in Menlo Park, California. This role involves leading planned and reactive service operations, ensuring mechanical integrity of units, and performing configuration and startup of custom linear generator systems.

Senior Electrical Engineer at Mainspring Energy focused on inverter and grid integration. This role involves system-level architecture and validation of high-power conversion hardware, with hands-on testing and troubleshooting of grid-interactive inverters.

Mainspring Energy is seeking an R&D Test Engineer in Menlo Park, California. This role involves designing and executing tests on the Linear Generator, focusing on electrical and software changes to improve product capabilities. The engineer will collaborate with cross-functional teams, analyze data, and develop testing processes for next-generation products.

Director, Electrical Strategic Sourcing at Mainspring Energy in Menlo Park, California. This executive role leads the electrical commodity supply chain function, managing a team of commodity managers and program resources. Responsibilities include owning the departmental budget, developing organizational sourcing policies, and enabling next-generation product architecture through engineering-embedded sourcing.

Field Service Technician at Mainspring Energy. This role involves performing mechanical repairs and maintenance on generators, collaborating with engineers on component redesign, and conducting inspections. The position requires availability for on-call shifts and includes training at headquarters in Menlo Park, CA, with assignment to a specific service region requiring travel.

Senior Field Service Technician at Mainspring Energy responsible for planned and reactive service operations on generators. This role involves mechanical repair and maintenance, conducting inspections, and collaborating with engineers to address issues and improve designs. The technician will be assigned to a specific service region requiring travel and will participate in on-call shifts.

Mainspring Energy is seeking a Staff Mechanical Engineer for their Sealing Systems team. This role involves leading piston and ring development projects, designing complex moving parts, assessing failures involving coupled thermal, structural, materials, and fluid interactions, and designing test campaigns.

Mainspring Energy is seeking a Senior Materials and Process Engineer to scale production of their Linear Generators. This role involves developing and validating cost-effective materials solutions, focusing on graphite components and tribological systems, and collaborating with cross-functional teams.

Mainspring Energy is seeking a Senior Failure Analysis Engineer with a strong electrical engineering background. This role involves leading hands-on investigations of electrical failures, driving root cause analysis, and accelerating failure analysis throughput to improve hardware reliability.

Mainspring Energy is seeking a Senior Sales Engineer to join their Sales Engineering team. This role is responsible for technical contributions within the sales cycle, focusing on solution architecture, estimating, and system integration strategy.

Mainspring Energy is hiring a Staff Electrical Engineer specializing in Power Electronics in Menlo Park, California. This role involves designing, validating, and troubleshooting custom power electronics hardware for their Linear Generator technology, collaborating with manufacturing teams, and improving hardware reliability.

Mainspring Energy is seeking a Principal Mechanical Engineer to serve as a company-level technical authority for their Linear Generator platform. This role involves shaping long-term technical direction, defining architecture and design principles, guiding critical technical decisions, and solving novel and ambiguous problems central to product and business success.

Mainspring Energy is seeking a Mechanical Engineer to own defined-scope mechanical engineering tasks, workstreams, or moderate-complexity projects for their Linear Generator platform. The role involves designing mechanical hardware, supporting analysis and testing, and driving work through validation and release, requiring cross-functional collaboration.

The Electronics Returns & Repair Manager at Mainspring Energy is responsible for the end-to-end lifecycle management of field-returned electronic control assemblies. This includes overseeing reverse logistics, diagnostics, repair, testing, refurbishment, and inventory replenishment to maximize fleet availability and improve product reliability.

Mainspring Energy is seeking a Senior Electrical Engineer specializing in Power Electronics to design, validate, and troubleshoot custom power electronics hardware for their Linear Generators. This role involves collaborating with manufacturing and reliability teams to improve designs and ensure product quality.

Mainspring Energy is seeking a Director of Mechanical Engineering in Menlo Park, California. This executive role will lead a significant portion of the mechanical engineering team responsible for scaling the Linear Generator, a novel distributed power platform. The director will manage approximately 25 direct and indirect reports and oversee critical subsystems.

Mainspring Energy is seeking a Senior Mechanical Engineer focused on Continuous Improvement for Mechanical Design & Quality Control. This role involves leading product improvement efforts, addressing design and manufacturing issues at a contract manufacturer, and redesigning critical components for durability and ease of service.

Mainspring Energy is seeking a Senior Mechanical Design Engineer to focus on electrical enclosures and cables. This role involves leading projects from requirements setting through design, reviews, testing, and release, with a focus on improving functionality and system-level performance of their Linear Generators.

Mainspring Energy is seeking a Staff Mechanical Design Engineer focused on electromechanical systems. This role involves leading projects from requirements to release, with a focus on designing electrical enclosures and cables to improve functionality and system-level performance.

Mainspring Energy is seeking a Senior Staff Mechanical Engineer to shape technical direction across multiple teams, systems, or major program areas within their Linear Generator platform. This role involves guiding system-level design decisions, resolving complex cross-functional tradeoffs, and identifying risks. The ideal candidate will operate with high autonomy and influence technical decision quality across projects.

Staff CFD Modeling Engineer at Mainspring Energy will support the design, test, and manufacture of linear generators. Responsibilities include analyzing transient gas flow, chemical kinetics, and heat transfer using commercial CFD software, managing computational resources, and working with mechanical engineers on 3D models and meshing.

Mainspring Energy is seeking an Electrical Upgrades Technician in Menlo Park, California. This role involves diagnosing and repairing electronics, installing new equipment, and implementing electrical upgrades. Responsibilities include collaborating with various teams, following assembly and testing procedures, and executing corrective actions to minimize downtime.

Mainspring Energy is seeking a Staff Mechanical Engineer for their Linear Generator platform in Menlo Park, California. This role involves owning defined-scope mechanical engineering tasks, designing hardware, supporting analysis and testing, and driving work through validation and release.

Mainspring Energy is hiring a Staff Reliability Engineer in Menlo Park, California. This role involves evaluating design risks, implementing tests and analyses to quantify and reduce risk, and performing failure analysis. The engineer will use tools like FMEA and HALT, and conduct mechanical stress, shock, vibration, and environmental testing.

Mainspring Energy is seeking an End of Line Technician to join their Product Testing team. This role involves mechanical and electromechanical assembly, diagnostics, repair, and testing of linear generator technology, with occasional field support.

Mainspring Energy is seeking a Senior Electrical Engineer, Electronics Design to lead the end-to-end ownership and technical direction of critical electrical hardware and PCBA designs for their Linear Generators. This role involves designing advanced low-voltage (< 60V) systems, spearheading hardware validation, and shaping the power generation control architecture.

Mainspring Energy is seeking a Senior Staff Technical Program Manager to lead critical product development initiatives for their Linear Generator. This role involves owning complex, multi-disciplinary programs from definition through manufacturing, driving cross-functional alignment, and communicating with executive leadership.

Staff Manufacturing Process Engineer at Mainspring Energy in Menlo Park, California. This role focuses on developing, validating, and optimizing manufacturing processes to enable scalable, high-volume production. The engineer will proactively influence product and process decisions using shop floor data and structured experimentation.

Mainspring Energy is seeking a Senior Machinist / R&D Specialist for their Menlo Park facility. This role involves supporting the engineering development lab by programming, setting up, and operating CNC machines, vertical mills, lathes, and traditional machines to produce complex R&D prototype parts from metals and composite materials.

Mainspring Energy is seeking a Staff Electrical Engineer, Electronics Design to lead the end-to-end ownership of critical electrical hardware and PCBA designs for their Linear Generator. This role involves designing advanced low-voltage (< 60V) systems, guiding cross-functional teams, and shaping the power generation control architecture.

Mainspring Energy is seeking an innovative and autonomous Electrical Engineer, Electronics Design to lead the design of critical electrical hardware and PCBA for their Linear Generators. This role involves end-to-end ownership of low-voltage (< 60V) systems, guiding cross-functional teams, and shaping the power generation control architecture.

Senior Embedded Software Manager at Mainspring Energy in Menlo Park, California. This role involves leading an embedded software engineering team, defining technical roadmaps, supervising and mentoring engineers, managing the software development lifecycle, and driving engineering excellence in code quality, architecture, and reliability.

Mainspring Energy is seeking an Electrical R&D Technician for their Menlo Park, California location. This role involves electrical fabrication, assembly, and troubleshooting, with a focus on high voltage and large electrical equipment in an R&D setting.

Fleet Operations & Analytics Engineer at Mainspring Energy responsible for managing the daily operations of the Linear Generator fleet, including remote operation, troubleshooting, and incident resolution. This role involves contributing to a real-time monitoring and communication platform and performing advanced data analysis to improve the product and communicate fleet performance.

Mainspring Energy is seeking a Senior Staff Electrical Engineer to lead power plant integration. This role involves owning the technical architecture and vision for how Mainspring power plant sites are built, focusing on modular power skids and the integration of generators, inverters, and energy storage systems.

Mainspring Energy is seeking a Staff Supplier Quality Engineer specializing in Special Processes. This senior individual contributor role is responsible for owning the quality gate for suppliers from NPI through steady-state production, acting as the subject matter expert on special processes, and collaborating cross-functionally to build quality into the supply chain.

Mainspring Energy is seeking a Director of Origination to lead their commercial strategy and transaction execution within Public Power. This executive-level role requires a strong networker and dealmaker to drive high-value, complex transactions from initial contact to financial close.

Field Service Programs & Operations Engineer at Mainspring Energy in Menlo Park, California. This is a hands-on engineering role supporting Operations & Maintenance by translating field challenges into technical solutions, scalable service programs, and improved maintenance practices. Responsibilities include developing and implementing field service programs, providing advanced technical troubleshooting, and acting as a technical bridge between Field Service and Engineering.

Director, Reliability Engineering at Mainspring Energy in Menlo Park, California. This role involves building and leading a reliability engineering function to evaluate, quantify, and reduce design risk for linear generators. Responsibilities include owning the reliability strategy, building and developing a team, and acting as a senior voice for reliability across product engineering, R&D, and manufacturing.

Senior Software Engineering Manager at Mainspring Energy leading a high-performing team in a fast-paced startup. This role bridges complex software ecosystems (Cloud, Embedded, Controls) with the physical world, requiring leadership in integrated software solutions and interdisciplinary collaboration with hardware engineers.

Senior Staff, Contract Manufacturing & Strategic Partnerships at Mainspring Energy in Menlo Park, California. This role will set the strategy and operating model for Mainspring's contract manufacturing network and serve as the executive owner of its most critical manufacturing partnerships. The leader will translate product, demand, and growth roadmaps into multi-year partner strategies to secure capacity, improve cost, quality, delivery, and inventory performance.

Associate Operations Support Specialist II at Mainspring Energy is a remote role focused on monitoring system alerts, responding to issues, and executing troubleshooting actions based on flowcharts. The specialist will learn electro-mechanical hardware systems, restart hardware, escalate issues, and maintain detailed logs.

Staff Electrical Engineer at Mainspring Energy responsible for the Linear Generator's power delivery and integration. This role involves owning the selection, integration, configuration, and performance of commercial off-the-shelf inverters, specifically in the 100kW to 1MW+ range.

Senior Modeling & Simulation Engineer: Controls Integration at Mainspring Energy. This role involves refining generator design by creating tools for control system design and validation. Responsibilities include writing numerical models for dynamic behavior, coordinating with controls engineers, generating test plans, and debugging solvers for ODEs/DAEs.

Staff Software Test and Automation Engineer at Mainspring Energy in Menlo Park, California. This role involves architecting core validation and automation frameworks to ensure the safety and reliability of a novel energy generation product. The engineer will own the strategy for testing the integration of real-time embedded software, predictive control loops, and multi-fuel dynamics.

Mainspring Energy is seeking a Senior Originator for Public Power to drive commercial strategy and transaction execution. This role involves sourcing, structuring, negotiating, and closing high-value commercial arrangements with Municipalities, Electric Cooperatives, and IOUs, leveraging an existing network of utility relationships.

Mainspring Energy is seeking a Principal Electrical Engineer - Power Plant Integration Lead in Menlo Park, California. This role involves owning the technical architecture and vision for Mainspring power plant sites, translating high-level concepts into mass-manufacturable modular skid-based products, and managing cross-functional teams and external partners.

Mainspring Energy is seeking a Senior Reaction Controls Engineer in Menlo Park, California. This role involves optimizing system performance by integrating physics-based models with modern control algorithms for linear generators. Responsibilities include implementing models and tests in C++, developing control strategies, and analyzing experimental data.

Manager of Technical Writing at Mainspring Energy, a company that manufactures fuel-flexible power solutions. This role involves leading a team responsible for creating clear and actionable technical documentation for complex engineering and manufacturing processes, including digital technical visuals.

Field Service Technician at Mainspring Energy in Menlo Park, California. Responsibilities include mechanically repairing and performing maintenance on generators, conducting inspections, and collaborating with engineers. This role requires availability for on-call shifts and offers opportunities for relocation.

Staff Technical Program Manager, Software Engineering at Mainspring Energy in Menlo Park, California. This role acts as an operational catalyst for critical software initiatives, translating strategy into delivery and bridging hardware and software development cycles. Responsibilities include owning programs end-to-end, building integrated schedules, and championing high-velocity execution through scalable engineering workflows.

The Field Service Manager at Mainspring Energy leads Field Service Supervisors to ensure the performance, availability, and reliability of the company's operating fleet. This role involves translating fleet performance objectives into field execution, managing teams, and collaborating with various internal departments to identify risks and improve field service effectiveness.

Mainspring Energy is seeking a Staff Controls Software Engineer to develop and test software for integrating Linear Generators into global energy infrastructure. The role involves building commercial-grade site control systems, ensuring seamless integration with Microgrids, DERs, and power plants, and writing high-quality code within a Scrum framework.

Mainspring Energy is seeking a Staff Materials and Process Engineer to scale production of their Linear Generators. This role involves developing and validating cost-effective materials solutions, focusing on graphite components and tribological systems. The engineer will collaborate with cross-functional teams to optimize material and process specifications and ensure reliability requirements are met.

Mainspring Energy is seeking a Senior/Staff Materials Process Engineer to join their team in Menlo Park, California. This role involves developing and validating cost-effective materials solutions for cast metal components and other mechanical systems within their Linear Generator product. The engineer will collaborate with cross-functional teams to characterize material properties, optimize specifications, and ensure reliability requirements are met.

Senior Software Engineer in Test at Mainspring Energy in Menlo Park, California. This role involves building new automation systems and testing approaches for areas like cloud computing, networking, IoT, and real-time operating systems. Responsibilities include architecting automation frameworks, validating hardware/software integrations, and leading root cause analysis.

Mainspring Energy is seeking a Staff Mechanical Engineer - Battery Design to lead battery pack and module development for their energy platforms. This role involves defining next-generation battery architectures, improving existing systems, and partnering with suppliers to influence designs, focusing on safety, reliability, manufacturability, performance, and cost.

Mainspring Energy is seeking a Senior R&D Mechanical Technician to join their team in Menlo Park, California. This role involves developing fuel-flexible, low-emissions local power solutions, specifically focusing on building and testing components and assemblies for their linear generators.

Senior Buyer/Planner at Mainspring Energy in Menlo Park, California. This role involves managing commodities and suppliers from quote to pay, ensuring supply continuity, and reducing costs. Responsibilities include managing purchase orders, translating demand forecasts into supply plans, monitoring inventory, and serving as the primary supplier contact.

Senior Reliability Engineer, Electrical Systems at Mainspring Energy. This role involves performing reliability testing, conducting failure analysis, and leading cross-functional teams in risk assessment processes like FMEA. The engineer will also develop verification test plans and design specialized test equipment.

Embedded Software Manager at Mainspring Energy leading an engineering team. Responsibilities include team leadership, project management, cross-functional collaboration, and providing technical guidance for embedded systems.

Mainspring Energy is seeking a Senior Field Service Technician in Menlo Park, California. This role involves performing mechanical repairs and maintenance on generators, collaborating with engineers on component redesign, and conducting inspections. The position requires a minimum of 5 years of mechanical experience and availability for on-call shifts.

Mainspring Energy is seeking a Mechanical Drafter to support their engineering team for their Linear Generator platform. The role involves CAD modeling and drawing work for COTS and custom parts, assembly rebuilds, and implementing engineering requests using SolidWorks and PLM.

Electrical Engineer at Mainspring Energy focused on power systems integration. This role involves system-level architecture and validation of high-power conversion hardware, specifically grid-interactive inverters, ensuring their performance and stability before deployment. Responsibilities include hands-on lab testing, firmware tuning, and field performance monitoring.

Vice President of Financial Planning & Analysis at Mainspring Energy in Menlo Park, California. This executive role reports to the CFO and leads enterprise-wide financial planning, forecasting, long-range planning, and strategic financial analysis. The position focuses on enterprise financial strategy, top-down analysis, and long-range planning, driving the company's strategic planning process and shaping financial strategy for growth.

Mainspring Energy is seeking a Staff Reliability Engineer, Electrical Systems in Menlo Park, California. This role involves performing reliability testing, conducting failure analysis, and leading cross-functional teams in risk assessment processes like FMEA.

Mainspring Energy is seeking a Senior Mechanical Engineer to own significant mechanical engineering projects and subsystems for their Linear Generator platform. This role involves developing robust mechanical designs, driving projects through the full design cycle, and collaborating cross-functionally to validate and release hardware.