{"id":127888,"url":"https://alion.io/job/letta-software-engineer-agent-harness","title":"Software Engineer, Agent Harness","company":{"id":48112,"name":"Letta","domain":"letta.com","url":"https://alion.io/company/letta","size_band":"1-10","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"B","score":75,"open_postings":4,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-16T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":null,"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":null,"salary_estimate":{"min_usd":147000,"max_usd":309000,"period":"year","method":"role_country_seniority_unknown","sample_n":8485},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Anthropic","optional":false},{"name":"Letta","optional":false},{"name":"LLM","optional":false},{"name":"Ollama","optional":false},{"name":"OpenAI","optional":false},{"name":"PostgreSQL","optional":false},{"name":"Python","optional":false},{"name":"Ray","optional":false},{"name":"Spark","optional":false},{"name":"SQL","optional":false},{"name":"Tailwind CSS","optional":false},{"name":"TypeScript","optional":false},{"name":"vLLM","optional":false}],"status":"live","first_seen_at":"2024-09-03T22:37:01Z","employer_posted_date":"2024-09-03","last_verified_at":"2026-10-16T10:57:47Z","board_verified":true,"closed_at":null,"days_open":772,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":772},"description":"Solving Self-Improving Superintelligence\nThe human brain is a sponge. Today’s AI brains are brittle and rigid. At Letta, we’re building self-improving artificial intelligence: creating agents that continually learn from experience and adapt over time.\nFounded by the creators of MemGPT from UC Berkeley’s Sky Computing Lab (the birthplace of Spark and Ray). Backed by Jeff Dean, Clem Delangue, and pioneers across AI infrastructure. Our agents already power production systems at companies like 11x and Bilt Rewards, learning and improving every day.\nWe’re assembling a world-class team of researchers and engineers to solve AI’s hardest problem: making machines that can reason, remember, and learn the way humans do.\nNote that this role is in-person (no hybrid), 5 days a week in downtown San Francisco.\nWe are building the developer stack for agents that can run in production applications, not just demo notebooks. As a Software Engineer, you will bridge the gap bleeding-edge agent systems and production-grade software for running agents in real applications. You will help define developer APIs for agents, and lead development of our company’s OSS stack as well as the hosted service.\nResponsibilities:\nDevelop Letta's OSS agents framework and cloud service\n\nDesign scaleable & resilient backend services and APIs to support Letta Cloud\n\nWork with researchers and support bleeding-edge agent architectures in Letta\n\nRequired skills:\nStrong proficiency with Python\n\nStrong understanding of how to architect services for security, reliability, and performance\n\nAbility to build scaleable backend services\n\nStrong understanding of SQL databases (Postgres)\n\nFamiliarity with tooling across the AI stack, such as inference engines (e.g. vLLM, Ollama), and LLM provider APIs (OpenAI, Anthropic)\n\nBonus: proficient with TypeScript, React, Tailwind, etc. (the modern stack for web applications)\n\nOur culture\nSigns it could be a great fit:\nYou want to maximize your impact: you want work on a small, incredibly talented team where every individual plays a huge role in the team's success. You wonder what it would have been like to be at OpenAI when it was just a dozen people, or Google when it was just a couple of grad students in a garage.\n\nYou’re excited to go head-to-head with tech giants, frontier labs, and other startups that are many times our size in both headcount and funding.\n\nYou are fundamentally opposed to closed frontier AI that is controlled by a handful of billionaires and private tech companies.\n\nSigns it’s a bad fit:\nYou like stability, and get stressed out when there’s nobody telling you exactly what to do. We look for people that thrive in ambiguity and can intuit the most important problems by talking to customers and dogfooding our product.\n\nYou want to work a 9-5, and value clear separation of work from life. The stakes are the highest they've ever been, and the only moat is execution velocity. Operating on a strict 9-5 guarantees failure.\n\nYou value titles or want to people-manage. Letta is a flat company where every researcher and engineer is an individual contributor.\n\nOur Interview Process:\nInitial screen (30 min)\n\nTechnical screen (1-1.5 hours)\n\nPaid in-person work trial (2 days onsite in SF)","description_format":"text","description_chars":3240,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["AI Agents","AI Development Tools"],"lifecycle":[{"event":"open","at":"2024-09-03T22:37:01Z"},{"event":"open","at":"2026-09-25T19:59:16Z"}],"visa":[{"country":"US","licensed_sponsor":true,"evidence":"H-1B filings in 12 months: 2","filings_12m":2,"filings_prev_12m":1,"green_card_filings_12m":0,"median_offered_wage_usd":97500,"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":4,"band":"cold","label":"Long shot","p_open":1,"p_active":0.133,"p_room":0.28,"age_days":772,"expected_fill_days":26,"reasons":["conf:3","win:tail","crowd:"],"computed_at":"2026-10-16T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/letta-software-engineer-agent-harness","json_url":"https://alion.io/job/letta-software-engineer-agent-harness.json","meta":{"generated_at":"2026-10-16T12:07:12Z","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":11223,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-17T00:00:00Z"}},"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":48112},"rest":"https://alion.io/mcp/rest/get_company?id=48112"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fletta-software-engineer-agent-harness"},{"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%2Fletta-software-engineer-agent-harness"},{"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%2Fletta-software-engineer-agent-harness"},{"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/letta-software-engineer-agent-harness\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fletta-software-engineer-agent-harness"}]}