{"id":42501,"url":"https://alion.io/job/zyphra-full-stack-software-engineer","title":"Full-Stack Software Engineer","company":{"id":8989,"name":"Zyphra","domain":"zyphra.com","url":"https://alion.io/company/zyphra","size_band":"1-10","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"D","score":48,"open_postings":16,"ghost_share":0.875,"stale_share":0,"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":151000,"max_usd":318000,"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":"Agentic Workflows","optional":false},{"name":"AI Agents","optional":false},{"name":"Embeddings","optional":false},{"name":"Fine-tuning","optional":false},{"name":"GDPR","optional":false},{"name":"Machine Learning","optional":false},{"name":"OCR","optional":false},{"name":"Playwright","optional":false},{"name":"Python","optional":false},{"name":"RAG","optional":false},{"name":"Reinforcement Learning","optional":false},{"name":"SOC 2","optional":false}],"status":"live","first_seen_at":"2026-03-17T03:53:59Z","employer_posted_date":"2026-03-17","last_verified_at":"2026-10-16T17:53:10Z","board_verified":true,"closed_at":null,"days_open":213,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":213},"description":"Zyphra is an artificial intelligence company based in San Francisco, California.\nThe Role:\nAs a Full-Stack Software Engineer, you will be a core contributor to Zyphra’s Agentic Systems and Interaction projects. You will be at the forefront of building a next-generation desktop and browser-based agent (end-to-end) that can autonomously navigate the web, interact with filesystems, and complete complex user tasks. This role spans agentic orchestration, frontend interfaces, secure sandboxing environments, large-scale document search and retrieval, and language/vision model integration.\nYou’ll Work Across:\nDesign and implementation of different agentic system designs capable of interacting with browsers, operating systems, enterprise filesystems, collaboration tools, etc.\n\nBuilding search and retrieval pipelines across large-scale structured and unstructured data\n\nBuild the backend layer for RAG systems and other information context management systems required for agents to operate\n\nIntegrating LLMs, vision models, reinforcement learning, and scaffolding frameworks for autonomous, multi-step decision-making\n\nWhat matters most is your drive to build production-grade software\n\nWe value velocity and curiosity, especially in fast-moving and ambiguous environments\n\nWhat We're Looking For / Requirements:\nProficiency in Python and a deep understanding of building and debugging complex end-to-end applications\n\nExperience working with SaaS environment and production workloads, web interfaces, databases, search engines, and queuing systems\n\nExperience developing browser extensions or automation tools with fine-grained control over the browser (mouse, tabs, DOM)\n\nUnderstanding of LLMs, prompting techniques, and orchestration frameworks for multi-step reasoning\n\nAbility to work across the whole stack from web interfaces to control plane and data infrastructure like queuing systems, databases, and search indexes\n\nExperience designing or working with secure and virtualized execution environments\n\nExcellent communication and collaboration skills across product, research, and engineering teams\n\nQualifications / Additional Skills:\nExperience building or integrating retrieval-augmented generation (RAG) systems\n\nExperience working with enterprise security and compliance frameworks (i.e., SOC 2, GDPR, etc.)\n\nFamiliarity with embeddings, vector databases and large-scale document indexing\n\nKnowledge of web automation tools and headless browser environments (i.e., Puppeteer, Playwright)\n\nUnderstanding of sandboxed or containerized compute environments with strict access controls\n\nComfort designing user-facing agentic workflows and reasoning systems that span multiple modalities (text, vision, actions)\n\nExperience using and fine-tuning models for screen reading, OCR, or UI understanding\n\nBackground in HCI or interest in building intuitive agent interfaces that extend human capabilities\n\nMachine Learning experience as a double bonus\n\nWhy Work at Zyphra:\nOur research methodology is grounded in methodical, step-by-step approaches to ambitious goals. Both deep research and engineering excellence are equally valued\n\nWe strongly value new and crazy ideas and are very willing to bet big on new ideas\n\nWe move as quickly as we can; we aim to minimize the bar to impact as low as possible\n\nWe all enjoy what we do and love discussing AI\n\nBenefits and Perks:\nComprehensive medical, dental, vision, and FSA plans\n\nCompetitive compensation and 401(k) plan\n\nRelocation and immigration support on a case-by-case basis\n\nIn-office snacks and meals provided\n\nUnlimited PTO and company holidays\n\nIn-person team in San Francisco with a collaborative, high-energy environment","description_format":"text","description_chars":3685,"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":["Unlimited PTO"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":true,"industries":["Foundation Models","AI Research Labs"],"lifecycle":[{"event":"open","at":"2026-03-17T03:53:59Z"},{"event":"open","at":"2026-09-26T08:09:20Z"}],"visa":[],"liveness":{"score":3,"band":"cold","label":"Long shot","p_open":1,"p_active":0.093,"p_room":0.28,"age_days":213,"expected_fill_days":26,"reasons":["conf:1","stale_co","ghost","win:tail","crowd:"],"computed_at":"2026-10-16T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/zyphra-full-stack-software-engineer","json_url":"https://alion.io/job/zyphra-full-stack-software-engineer.json","meta":{"generated_at":"2026-10-16T18:19:22Z","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":3281,"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":8989},"rest":"https://alion.io/mcp/rest/get_company?id=8989"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fzyphra-full-stack-software-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%2Fzyphra-full-stack-software-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%2Fzyphra-full-stack-software-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/zyphra-full-stack-software-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fzyphra-full-stack-software-engineer"}]}