{"id":3231139,"url":"https://alion.io/job/momentic-ai-engineer","title":"AI Engineer","company":{"id":173556,"name":"Momentic","domain":"momentic.ai","url":"https://alion.io/company/momentic","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":null},"role":"AI/ML","role_family":"AI/ML","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":["San Francisco, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":175000,"max":250000,"currency":"USD","period":"year","gross":null,"usd_annual":250000},"salary_estimate":null,"experience_years_min":3,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"Fine-tuning","optional":false},{"name":"LLM","optional":false},{"name":"Notion","optional":false},{"name":"SFT","optional":false},{"name":"Webflow","optional":false},{"name":"Xero","optional":false},{"name":"Dropbox","optional":true},{"name":"Reinforcement Learning","optional":true}],"status":"live","first_seen_at":"2026-10-25T06:42:32Z","employer_posted_date":"2026-10-25","last_verified_at":"2026-10-28T14:52:01Z","board_verified":true,"closed_at":null,"days_open":3,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":3},"description":"Momentic is building the definitive verification layer for software: an AI-native testing platform that helps engineering teams catch bugs before they ship. As AI accelerates software development, teams need a reliable way to verify that their products work. Engineering teams at Notion, Webflow, Xero, and Whatnot use Momentic to ship with confidence.\nYou’ll join our engineering team and work closely with our CTO to improve the models and agents behind Momentic. We’re looking for a hands-on AI engineer who can fine-tune models, build evaluations, and turn production data into more reliable, efficient agents. Momentic executes more than 1 million tests daily and processes more than 1 billion tokens per hour at peak, giving your improvements a direct impact on the product.\nWhat you’ll do\nFine-tune models for long-running agents, including agents that investigate whether test failures come from infrastructure, recent code changes, or test authorship.\n\nBuild and curate training and evaluation datasets from production workflows, using failure patterns to identify opportunities for improvement.\n\nDevelop LLM evaluations and observability that connect offline results with production behavior and help the team verify improvements.\n\nTune prompts, context, and model behavior to improve task success, reliability, latency, token usage, and cost.\n\nDesign repeatable experiments and help publish benchmarks that demonstrate our core agents’ performance on testing and browser workflows.\n\nOwn technical projects from problem definition through delivery, working with the engineering team to make practical tradeoffs and ship improvements.\n\nYou’re perfect for this role if…\nYou have relevant software engineering experience, typically 3+ years, including hands-on contributions to AI-powered capabilities used in production.\n\nYou have hands-on experience with supervised fine-tuning, including preparing training data and evaluating model behavior.\n\nYou’ve worked with prompt and context tuning, evaluation datasets, and LLM observability to diagnose failures and measure improvements.\n\nYou have strong engineering fundamentals, code efficiently, and know what you’re great at and where you have room to grow.\n\nYou use AI agents to build software, breaking down work, tracking progress, checking results, and redirecting agents when they get stuck.\n\nYou’re comfortable with autonomy and ambiguity. You can turn an unclear problem into a plan, manage your own work, and follow through to delivery.\n\nWe’re interested in the depth of your contributions and what you’ve shipped. Your experience may come from owning an AI capability within a larger product.\nNice to haves\nExperience with reinforcement learning fine-tuning, RL environments, or LLM-as-judge evaluators.\n\nExperience with long-running agents, recovery from failed steps, or coordinating multiple agents.\n\nExperience publishing benchmarks or running rigorous experiments on AI systems.\n\nAbout us\nRaised a $15M Series A led by Standard Capital, with backing from Y Combinator, FCVC, Transpose Platform, and Dropbox Ventures.\n\nOur customer base has grown 4× year to date.\n\nA team of 17 and growing.\n\nBased in person in San Francisco at 650 5th Street.\n\nBenefits\nMedical, dental, and vision insurance.\n\n401(k).\n\nUnlimited PTO and sick days, plus company-observed US holidays.\n\nDaily lunch and a fully stocked kitchen.\n\nCommuter benefits.\n\nTeam offsites and events.","description_format":"text","description_chars":3424,"description_truncated":false,"requirements":{"experience_years_min":3,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Unlimited PTO","Vision insurance"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Software Testing & QA","AI Agents"],"lifecycle":[{"event":"open","at":"2026-10-25T08:27:07Z"}],"visa":[{"country":"US","licensed_sponsor":true,"evidence":"H-1B filings in 12 months: 1","filings_12m":1,"filings_prev_12m":1,"green_card_filings_12m":0,"median_offered_wage_usd":217500,"route":null,"cap_exempt":false,"checked_at":"2026-10-15T11:24:14+00:00","sources":["US Department of Labor: LCA disclosure data (H-1B, H-1B1, E-3)"],"filings_for_role_12m":0}],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":2,"expected_fill_days":30,"reasons":["conf:0","win:early"],"computed_at":"2026-10-28T05:59:10Z"},"pay":{"stated_usd_annual":250000,"is_top_pay":true},"html_url":"https://alion.io/job/momentic-ai-engineer","json_url":"https://alion.io/job/momentic-ai-engineer.json","meta":{"generated_at":"2026-10-28T17:32:40Z","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":23904,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-29T00:00:00Z"}},"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":173556},"rest":"https://alion.io/mcp/rest/get_company?id=173556"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fmomentic-ai-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%2Fmomentic-ai-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%2Fmomentic-ai-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/momentic-ai-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fmomentic-ai-engineer"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3231139}},{"tool":"search_jobs","arguments":{"company":"momentic.ai","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3231139},"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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