{"id":1743458,"url":"https://alion.io/job/xai-optical-engineer-data-center-memphis","title":"Optical Engineer - Memphis","company":{"id":28,"name":"xAI","domain":"x.ai","url":"https://alion.io/company/xai","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"A","score":87,"open_postings":95,"ghost_share":0,"stale_share":0.505,"repost_share":0,"time_to_fill_p50_days":59,"computed_at":"2026-10-13T05:45:00Z"}},"role":"Industrial Engineering","role_family":"Industrial Engineering","seniority":"junior","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Memphis, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":110000,"max_usd":198000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":3358},"experience_years_min":2,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"HPC","optional":false},{"name":"InfiniBand","optional":false}],"status":"live","first_seen_at":"2026-10-02T21:34:45Z","employer_posted_date":"2026-10-05","last_verified_at":"2026-10-13T09:20:36Z","board_verified":true,"closed_at":null,"days_open":10,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":10},"description":"SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today, SpaceX is actively developing the technologies to make this possible, with the ultimate goal of making life multiplanetary and expanding consciousness to the stars. \nSpaceXSI is building Super Intelligence to understand the universe and help expand humanity’s knowledge and capabilities. We work across the full Super Intelligence stack: compute (Colossus supercomputers), models (Grok), and applications (Grok Bot, Grok Build, Grok Imagine, Grok Voice, and X). We're creating a powerful flywheel where more compute trains better models, better models power more useful products, and what we learn from people using those products shapes what we build next.\nABOUT THE ROLE:\nThe Data Center Engineering team designs training and inference compute clusters from first principles, pushing thermal, electrical, and optical systems to the limit of physics. We operate as a highly cross-disciplinary team of mechanical, electrical, optical, and software engineers, all working to maximize the efficiency, reliability, and deployment speed of terrestrial computing to serve rapidly scaling demand.\nThis team owns compute architecture, datacenter network design, rack builds, connectivity, in-house design of our own computers, and the manufacturing line that builds that compute. As an Optical Engineer, you will own the physical optical layer of that computer: fiber layout, link design, connector and polarity architecture, optics selection, and production of a plant that can be built, tested, and repaired at AI cluster scale.\nRESPONSIBILITIES:\nOwn end-to-end optical and fiber design for AI training and inference fabrics: fiber cabling, cassette/panel architecture, polarity, breakout, reach, and connector strategy (MPO-12/16, SN, MDC, LC, OSFP / QSFP-DD)\nWrite and verify link budgets for scale-out and scale-up interconnect (SMF/MMF, AOC/DAC, DR/FR/LR, InfiniBand and Ethernet), including loss, reflections, FEC, and realistic install margins\nDevelop and implement factory tests for optical interconnects including insertion loss, return loss, and polarization\nSelect and qualify optics, fiber, and connectivity (transceivers, patch, trunks, cassettes, harnesses); own vendor bring-up, failure analysis, and fleet reliability of the optical layer\nDeploy and verify end-to-end optical interconnect into the manufacturing line\nLead commissioning and debug: inspect/clean, power meter, OTDR, BER/FEC stats, and volume failure modes (dirty connectors, wrong polarity, wrong map, damaged end-face)\nEvolve connectivity toward the next speed and density (800G / 1.6T, CPO/NPO awareness, tighter reaches, higher fiber count per rack)\n Work with mechanical and network teams to design structured cabling and raceways with the rack and facilities teams: tray fill, bend radius, pre-term vs field-term, labeling, and a plant that can be built and repaired at hall scale\nBASIC QUALIFICATIONS:\nBachelor’s degree in electrical engineering, optical engineering, physics, or a related engineering discipline\n2+ years of professional experience in fiber layout, optical link design, and/or datacenter/HPC optical engineering\nPREFERRED SKILLS AND EXPERIENCE:\nDemonstrated ownership of fiber or optical design that was installed and turned up in a datacenter, HPC, or AI-compute environment\nWorking command of single-mode vs multimode, MPO polarity, insertion/return loss, and 100G+ transceiver classes\nHands-on optical test: inspect/clean, power meter, OTDR or equivalent\nFiber interconnect ownership for AI / high-compute clusters (GPU scale-out fabric, InfiniBand NDR/XDR, RoCE Ethernet 400/800G)\nHigh-density pre-terminated trunk/cassette design and rack-to-spine optical mapping at hall scale\nOptics vendor qualification at volume (OSFP, 800G DR8/2xFR4, AOCs, and the failure modes that show up in a real fleet)\nExperience designing optical harnesses or cassettes for a manufacturing line, including test coverage and yield\nDWDM / campus DCI for cluster-to-cluster or building-to-building connectivity\nFamiliarity with CPO/NPO, linear-drive optics, and next-gen packaging as it hits the rack\nTime at a high-velocity AI cloud, GPU cloud, or custom-compute hardware team\nADDITIONAL REQUIREMENTS:\nMust be willing to work extended hours and weekends as needed to support design releases, line bring-up, and cluster deployments\nMust be willing to travel to manufacturing and datacenter sites\nAbility to work in active datacenter and factory environments, including fiber inspection, cleaning, and live debug\nSpaceXAI is an equal opportunity employer. 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