{"id":724061,"url":"https://alion.io/job/propervoltage-mechanical-engineer-iii-battery-systems-engineering","title":"Mechanical Engineer III – Battery Systems Engineering","company":{"id":687251,"name":"Proper Voltage","domain":"propervoltage.com","url":"https://alion.io/company/propervoltage","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Rippling","truth_index":null},"role":"Robotics","role_family":"Robotics","seniority":"middle","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Carlsbad, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":130000,"max":165000,"currency":"USD","period":"year","gross":null,"usd_annual":165000},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":true,"relocation_package":false,"has_equity":false,"technologies":[{"name":"SolidWorks","optional":false}],"status":"live","first_seen_at":"2026-07-10T21:07:14Z","employer_posted_date":"2026-07-10","last_verified_at":"2026-09-29T03:58:48Z","board_verified":true,"closed_at":null,"days_open":81,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":81},"description":"Please note that we are unable to provide visa sponsorship for this position.\nRecruiting agencies: Proper Voltage does not accept unsolicited candidate submissions. Please do not contact any employees directly unless you have an existing engagement with the company.\nAbout Proper Voltage\nProper Voltage is unlocking the next generation of battery technology across robotics, data centers, and defense.\nWe're building intelligent battery systems that make advanced chemistries (sodium-ion, lithium-titanate, lithium-silicon) work in products that were never designed for them. Humanoid robots can upgrade power systems without redesigning their entire platform. Data centers get safer, cheaper backup power. Drones and autonomous vehicles get higher energy density without lengthy integration cycles.\nIf you want to work on hard engineering problems that matter this is the place.\nJob Overview\nWe're looking for an experienced mechanical engineer to take ownership of battery pack and module design from concept through production. This is a senior individual-contributor role: you'll drive design decisions independently, lead thermal and structural analysis efforts, and mentor junior engineers, while working closely with electrical, controls, and manufacturing teams to ship real hardware.\nDeep experience with thermal analysis and simulation is strongly preferred. We run active thermal test campaigns and simulation workflows, and this role owns that work rather than just supporting it.\nWhat you'll do\nBattery Mechanical Design\nOwn mechanical design of battery modules and packs end-to-end, including:\nCell integration concepts (prismatic, cylindrical, or pouch formats)\nStructural components, brackets, and enclosure design\nBusbar and interconnect geometry\nDrive design reviews, tolerance stack-up analysis, and DFM decisions\nDefine mechanical interfaces across the assembly and negotiate trade-offs with electrical and controls teams\nMake final calls on design trade-offs balancing performance, cost, and manufacturability\nThermal Analysis\nOwn thermal simulation setup, execution, and post-processing (SimScale, ANSYS, or equivalent)\nEvaluate and select TIM and interface materials based on performance and cost trade-offs\nDesign and run thermal test campaigns; independently analyze discharge data and identify root causes of thermal issues\nCorrelate simulation outputs to physical test results and refine models accordingly\nTesting & Validation\nDefine and lead mechanical validation test plans, vibration, drop, thermal cycling\nOwn root cause analysis on test findings and drive corrective actions to closure\nReview and approve test reports and documentation from junior engineers\nDocumentation, Process & Mentorship\nMaintain CAD revision history and BOM structure for your subsystems\nAuthor engineering documentation, test procedures, and work instructions\nLead design review discussions and drive action items to closure\nMentor Mechanical Engineer I/II staff on CAD practices, GD&T, and design fundamentals\nRequired Qualifications\nBachelor's degree in Mechanical Engineering or closely related discipline\n5+ years of professional mechanical engineering experience, ideally in battery, EV, or energy storage hardware\nDemonstrated track record taking designs from concept through production\nExpert-level 3D CAD skills (Onshape, SolidWorks, or equivalent)\nStrong command of GD&T, tolerance stack-up analysis, and DFM principles\nExperience owning mechanical subsystems independently, with minimal oversight\nAbility to mentor junior engineers and lead design review discussions\nPreferred Qualifications\nProficiency with FEA or CFD tools (SimScale, ANSYS, SolidWorks Simulation) for thermal and structural analysis\nDirect experience with battery-powered devices, EV systems, or energy storage products\nHands-on experience with manufacturing processes - machining, sheet metal, plastics, assembly\nWorking knowledge of UN 38.3 or UL safety standards\nExperience leading a physical prototype build from CAD through assembled hardware\nPrior experience mentoring or informally leading other engineers\nCompensation & Benefits\nSalary range: $130,000 - $165,000 annually (commensurate with experience)\nEquity participation as part of total compensation\nComprehensive healthcare benefits (medical, dental, vision)\nPaid time off and company holidays\nOpportunity to shape battery mechanical engineering practices as the team scales\nReady to work on power systems that matter? Let's talk.","description_format":"text","description_chars":4481,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":["Equity"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Industrial Engineering","Electrical & Electronic Engineering","Musical Instruments"],"lifecycle":[{"event":"open","at":"2026-09-11T07:56:34Z"}],"liveness":{"score":18,"band":"cold","label":"Long shot","p_open":1,"p_active":0.502,"p_room":0.35,"age_days":81,"expected_fill_days":38,"reasons":["conf:25","win:tail"],"computed_at":"2026-09-30T05:45:00Z"},"pay":{"stated_usd_annual":165000,"is_top_pay":false},"html_url":"https://alion.io/job/propervoltage-mechanical-engineer-iii-battery-systems-engineering","json_url":"https://alion.io/job/propervoltage-mechanical-engineer-iii-battery-systems-engineering.json","meta":{"generated_at":"2026-09-30T06:29:45Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","usage":{"tier":"crawler","counted_by":"address","units_charged":1,"used_today":4542,"day_limit":5000,"remaining_today":458,"minute_limit":60,"resets_at":"2026-10-01T00:00:00Z"}}}