{"id":878596,"url":"https://alion.io/job/lettrlabs-senior-mechanical-design-engineer","title":"Staff Mechanical Design Engineer","company":{"id":679352,"name":"LettrLabs","domain":"lettrlabs.com","url":"https://alion.io/company/lettrlabs","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":84,"open_postings":8,"ghost_share":0,"stale_share":0.625,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-11-09T06:03:00Z"}},"role":"Industrial Engineering","role_family":"Industrial Engineering","seniority":"staff","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Los Angeles, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":180000,"max":225000,"currency":"USD","period":"year","gross":null,"usd_annual":225000},"salary_estimate":null,"experience_years_min":7,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Python","optional":true}],"status":"live","first_seen_at":"2026-06-30T01:06:34Z","employer_posted_date":"2026-11-06","last_verified_at":"2026-11-09T19:20:32Z","board_verified":true,"closed_at":null,"days_open":132,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":132},"description":"Location: Los Angeles, CA (In-Office) | Full-time \nAbout the job\nThe opportunity\nLettrLabs is rebuilding itself as an AI-native company, and engineering is where that change goes deepest. We built our own engineering design harness: an AI system that works hand-in-hand with engineers to take requirements and carry a design all the way to final, producible parts, much faster than a traditional workflow.\nWe are looking for a Staff or Principal Mechanical Design Engineer to do two things at once. You will design LettrLabs' next-generation production automation platform. And you will shape the harness itself, deciding how real engineering judgment gets encoded into a tool that makes every engineer here faster.\nThis is a rare chance to define how hardware gets designed in the AI era, while shipping real machines to a real production floor, at a pace traditional workflows can't match.\nThis is a hands-on, individual contributor role reporting to the CTO. It is on-site in Los Angeles, in the office five days a week.\nWhat you'll do\nOwn the mechanical design of LettrLabs' production process machinery and next-generation automation platform as we work to fully automate our production, from open-ended problem statement through build, commissioning and deployment of production machinery on our floor.\n\nTurn ambiguous business and operational needs into clear system and subsystem requirements, then generate concepts, run trade studies and drive down-selection.\n\nTake designs through architecture to release, using our design harness as your primary toolchain.\n\nDrive material and process selection for performance, cost, manufacturability and service life.\n\nDefine and run validation: analysis, prototyping, test plans and design reviews that prove the design works before it ships.\n\nAct as a principal user and co-designer of our design harness. Find where it falls short, define what good looks like, and work with our AI and software engineers to iterate and build sound engineering practice into it.\n\nWhat we're looking for\n7 to 15+ years in a design-centric engineering role, primarily mechanical. Mechatronics/aerospace backgrounds with a strong mechanical core are welcome. Level (Staff or Principal) will be set based on experience and fit.\n\nA track record of designing complete systems end to end, through production, commissioning and deployment. You have seen your hardware run, broken it and fixed it.\n\nDeep experience with a phase-gate or stage-gate design process: requirements, concept, trade studies and down-selection, preliminary and critical/detailed design reviews (PDR, CDR/DDR), and release.\n\nStrength in turning open-ended problems into clear, testable requirements and concepts at the system and subsystem level.\n\nDeep knowledge of metals, polymers and composites, and sound judgment in material and process selection.\n\nStrong mechanical fundamentals: statics, dynamics, mechanics of materials, tolerancing, mechanisms and DFM/DFA. You make quick, pragmatic calls from first principles, then drill into analysis or test to close and validate the design. Rapid, AI-driven development depends on this judgment.\n\nNice to have\nExperience at a hard tech company known for engineering rigor and speed, such as aerospace, automotive, robotics, or industrial and factory automation.\n\nBackground in production automation equipment, motion systems, or high-throughput machinery.\n\nWorking knowledge of electromechanical integration: motors, actuators, sensors, controls, and their interfaces with the mechanical system.\n\nFamiliarity with GD&T, FEA, and design for reliability and serviceability.\n\nExperience scripting or building tools (Python or similar) to automate engineering work.\n\nWhy join us\nMost engineers will spend the next decade watching AI change how hardware is designed. Here, you get to build that change yourself. Your engineering judgment becomes part of a tool that multiplies the whole team, and you prove it out on machines that run our production every day.\nIf you have taken systems from a blank page to a working floor, and you want to help define what world-class engineering looks like in an AI-native company, we want to talk to you.\nCome help us build a better way to design hardware, and the automation platform it was made for.\nLettrLabs USA: $180,000 USD - $225,000 USD\nBenefits\nMedical, dental, and vision coverage\n\nEquity in a fast-growing company\n\n401(k) plan.\n\nFlexible PTO and paid holidays\n\nOn-site gym\n\nPet-friendly\n\nFree daily lunch, team off-sites, and happy hours\n\nLocated in the heart of Marina Del Rey, a walkable neighborhood with easy access to shops, restaurants, and the marina\n\nLettrLabs USA\n$180,000—$225,000 USD\nActual base salary offered will be determined by: experience, skills, and work location. This range is for base salary, our total compensation includes equity and benefits. We welcome you to apply even if your expectations are outside our listed range.\nLettrLabs is committed to creating a diverse environment and is proud to be an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.\nLettrLabs is committed to providing reasonable accommodations for qualified individuals with disabilities in our job application procedures and throughout employment. If you need assistance or any accommodation, please let us know.\nLettrLabs does not accept unsolicited resumes from recruiters or employment agencies without a fully executed recruitment agreement in place. In the absence of such agreement, LettrLabs reserves the right to pursue and hire any candidates without an obligation to pay fees. 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