{"id":2654590,"url":"https://alion.io/job/mainspring-energy-senior-product-performance-engineer","title":"Senior Product Performance Engineer","company":{"id":5556,"name":"Mainspring Energy","domain":"mainspringenergy.com","url":"https://alion.io/company/mainspring-energy","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"B","score":82,"open_postings":19,"ghost_share":0,"stale_share":0.526,"repost_share":0,"time_to_fill_p50_days":72,"computed_at":"2026-10-27T05:46:45Z"}},"role":"Product","role_family":"Product","seniority":"senior","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Menlo Park, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":129854,"max":152770,"currency":"USD","period":"year","gross":null,"usd_annual":152770},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"NumPy","optional":false},{"name":"Python","optional":false},{"name":"SciPy","optional":false}],"status":"live","first_seen_at":"2026-10-10T20:55:12Z","employer_posted_date":"2026-10-10","last_verified_at":"2026-10-27T09:45:22Z","board_verified":true,"closed_at":null,"days_open":16,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":16},"description":"Job Overview\nMainspring is seeking a rigorous, curious, and highly motivated Product Performance Engineer to own the performance of our Linear Generator. Reporting directly to the VP of Test Engineering, you will combine hands-on experimental work with in-depth data analysis to characterize, understand, and improve all aspects of the Linear Generators performance with emphasis on power output, efficiency, and emissions profiles. Your central mission is to make sure our products meet the performance targets defined in our internal Product Requirements Document (PRD), and to give engineering teams the insight they need to close any gaps. This role is ideal for an engineer or researcher with deep expertise in thermodynamics, power generation who wants to apply it to a first-of-its-kind product in a fast-paced development environment.\nResponsibilities\nAs the Product Performance Engineer at Mainspring Energy, you will:\nOwn the measurement and tracking of product performance, including power, efficiency, and emissions, against the targets defined in the PRD\n\nIdentify gaps between measured performance and PRD targets, and drive cross-functional efforts to close them\n\nDesign and execute experiments on Linear Generator test units, working hands-on with technicians and the test team to set up, instrument, and run studies\n\nBuild and maintain Python-based analysis tools and pipelines to process large test datasets, quantify performance, and identify trends and root causes\n\nApply first-principles thermodynamic and heat release analysis to explain observed performance\n\nCommunicate results clearly to design engineering teams, and make data-driven recommendations that guide design decisions\n\nDevelop and improve test methods, instrumentation, and processes to support performance validation on next-generation products\n\nQualifications\nPhD in mechanical engineering, aerospace engineering, chemical engineering, physics, or a related field, or a Master's degree with several years of applicable industry or research experience\n\nDeep expertise in thermodynamics/power generation, with the ability to apply it to real hardware and experimental data\n\nExcellent data analysis skills in Python (e.g., pandas, NumPy, SciPy), including working with large, noisy experimental datasets\n\nHands-on experience designing and executing experiments involving instrumentation and emissions testing\n\nStrong communicator with a collaborative mindset, comfortable presenting findings to leadership and working across teams\n\nStrong organizational skills and the ability to manage multiple priorities against 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