{"id":309713,"url":"https://alion.io/job/lightmatter-mechanical-design-engineer","title":"Mechanical Design Engineer","company":{"id":16141,"name":"Lightmatter","domain":"lightmatter.co","url":"https://alion.io/company/lightmatter-co","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":82,"open_postings":53,"ghost_share":0.302,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":50,"computed_at":"2026-11-07T05:47:08Z"}},"role":"Industrial Engineering","role_family":"Industrial Engineering","seniority":"middle","employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Mountain View, United States","Boston, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":135000,"max":212000,"currency":"USD","period":"year","gross":null,"usd_annual":212000},"salary_estimate":null,"experience_years_min":3,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"GD&T","optional":false},{"name":"HPC","optional":false},{"name":"SolidWorks","optional":false},{"name":"Abaqus","optional":true},{"name":"ANSYS","optional":true}],"status":"live","first_seen_at":"2026-05-13T18:43:56Z","employer_posted_date":"2026-08-25","last_verified_at":"2026-11-08T02:54:02Z","board_verified":true,"closed_at":null,"days_open":178,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":177},"description":"Lightmatter is leading the revolution in AI data center infrastructure, enabling the next giant leaps in human progress. The company invented the world’s first 3D-stacked photonics engine, Passage™, capable of connecting thousands to millions of processors at the speed of light in extreme-scale data centers for the most advanced AI and HPC workloads.\nLightmatter raised $400 million in its Series D round, reaching a valuation of $4.4 billion. We will continue to accelerate the development of data center photonics and grow every department at Lightmatter!\nIf you're passionate about tackling complex challenges, making an impact, and being an expert in your craft, join our team of brilliant scientists, engineers, and accomplished industry leaders.\nLightmatter is (re)inventing the future of computing with light!\nIn this role, you will be working on leading-edge packaging technologies to enable AI architectures that set new industry standards for compute power, performance, and efficiency. As a member of the Packaging team, you will collaborate with several teams to identify key failure modes under product use conditions and run appropriate parametric design studies to influence product and package design upstream. You will be responsible for the package stack-up analysis, co-optimizing mechanical, optical and thermal aspects that influence package form factors, and driving socket/enabling mechanisms. You will utilize Geometric Dimensioning and Tolerancing (GD&T) to propose solutions that finalize the design. Your work will result in advanced package designs that meet power dissipation, assembly, optical, and reliability requirements, while delivering a system level solution for leading edge products in the data centers and high-end compute segment.\nResponsibilities:\nCreate CAD models of package stack-up and associated components.\nPerform mechanical design analysis to identify and implement solutions that improve package mechanical integrity.\nExecute tolerance stack-up analyses and create GD&T drawings for advanced packages - including optically aligned assemblies where micron-level precision defines product performance\nApply manufacturing expertise to influence design choices, perform FMEAs, and evaluate the cost implications of process and design decisions.\nCollaborate with package and systems teams to ensure packaging solutions comply with system boundary conditions.\nRequirements: \nBS or MS in Mechanical Engineering or a related field.\nMinimum of 3 years of mechanical design experience in semiconductor packaging, optoelectronics, or photonics modules.\nProficiency in CAD tools such as Solidworks or Creo, with a focus on mechanical design best practices.\nExpertise in Geometric Dimensioning and Tolerancing (GD&T) and tolerance stack-up analysis.\nManage prototype builds with external vendors, validating the designs, and ensuring the scalability to high volume manufacturability.\nWorking knowledge of semiconductor packaging technologies, including the mechanical and thermal trade-offs of 3D, 2.5D, and FCBGA architectures.\nPreferred Qualifications\nKnowledge of ASME Y14.5 standards.\nAbility to drive results independently and with minimal supervision.\nWorking knowledge of FEA tools (ANSYS, Abaqus, or similar) for structural and thermal analysis.\nFiber array unit (FAU) attach, optical connector, or photonic alignment experience.\nExperience with liquid cooling or advanced thermal architectures for AI/HPC systems.\nExposure to high-volume manufacturing and OSAT engagement in Asia.\nStrong cross-functional communication skills and a bias toward fast, data-driven iteration.\nWe offer competitive compensation. The base salary range for this role determined based on location, experience, educational background, and market data.\nSalary Range: total compensation goes beyond base salary, it also includes a new hire equity grant, annual performance-based equity, and other rewards that recognize your impact and contribution.\n$135,000—$212,000 USD\nBenefits\nComprehensive Health Care Plan (Medical, Dental & Vision)\nRetirement Savings Matching Program\nLife Insurance (Basic, Voluntary & AD&D)\nGenerous Time Off (Vacation, Sick & Public Holidays)\nPaid Family Leave\nShort Term & Long Term Disability\nTraining & Development\nCommuter Benefits\nFlexible, hybrid workplace model\nEquity grants (applicable to full-time employees)\nBenefits eligibility may vary depending on your employment status and location. Lightmatter recruits, employs, trains, compensates, and promotes regardless of race, religion, color, national origin, sex, disability, age, veteran status, and other protected status as required by applicable law.\nExport Control\nCandidates should have capacity to comply with the federally mandated requirements of U.S. export control laws.","description_format":"text","description_chars":4788,"description_truncated":false,"requirements":{"experience_years_min":3,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":["Equity","Life insurance","Parental leave"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["AI Chips & Accelerators","Optics & Photonic Components"],"lifecycle":[{"event":"open","at":"2026-09-05T15:42:26Z"}],"visa":[{"country":"US","licensed_sponsor":true,"adverts_offering_sponsorship_24m":0,"sanctioned_now":false,"evidence":"H-1B filings in 12 months: 27 · green card filings: 1","filings_12m":27,"filings_prev_12m":14,"green_card_filings_12m":1,"median_offered_wage_usd":177679,"route":null,"cap_exempt":false,"checked_at":"2026-11-07T07:57:00+00:00","sources":["US Department of Labor: LCA disclosure data (H-1B, H-1B1, E-3)","US Department of Labor: PERM disclosure data (green cards)"],"filings_for_role_12m":0}],"liveness":{"score":8,"band":"cold","label":"Long shot","p_open":1,"p_active":0.3,"p_room":0.28,"age_days":177,"expected_fill_days":50,"reasons":["conf:3","velocity","ghost","win:tail","crowd:"],"computed_at":"2026-11-07T05:47:08Z"},"pay":{"stated_usd_annual":212000,"is_top_pay":true},"html_url":"https://alion.io/job/lightmatter-mechanical-design-engineer","json_url":"https://alion.io/job/lightmatter-mechanical-design-engineer.json","meta":{"generated_at":"2026-11-08T02:57:30Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":6306,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-09T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":16141},"rest":"https://alion.io/mcp/rest/get_company?id=16141"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Flightmatter-mechanical-design-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Flightmatter-mechanical-design-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Flightmatter-mechanical-design-engineer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/lightmatter-mechanical-design-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Flightmatter-mechanical-design-engineer"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":309713}},{"tool":"search_jobs","arguments":{"company":"lightmatter.co","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":309713},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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