{"id":2417801,"url":"https://alion.io/job/syndesus-sr-founding-backend-engineer","title":"Sr Founding Backend Engineer","company":{"id":4420272,"name":"Syndesus","domain":"syndesus.com","url":"https://alion.io/company/syndesus","size_band":"11-50","is_staffing_agency":false,"employer_type":"staffing","is_intermediary":false,"listed_via":null,"ats_vendor":"Gem","truth_index":{"grade":"D","score":40,"open_postings":23,"ghost_share":1,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-13T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","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":200000,"max":280000,"currency":"USD","period":"year","gross":null,"usd_annual":280000},"salary_estimate":null,"experience_years_min":2,"visa_sponsorship":true,"relocation_package":false,"has_equity":false,"technologies":[],"status":"live","first_seen_at":"2025-10-08T12:21:41Z","employer_posted_date":"2025-10-08","last_verified_at":"2026-10-13T11:00:59Z","board_verified":true,"closed_at":null,"days_open":370,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":369},"description":"Senior Backend Engineer | Voice AI Startup\nAbout the Company\nOur client is a fast-growing Y Combinator-backed Voice AI startup transforming sales, support, and customer engagement. With $5M in seed funding and approaching $30M ARR already, achieved with just 20 people, they're building the standard for voice automation at scale.\nThe Role\nAs a Founding Senior Backend Engineer, you'll build the core systems powering millions of AI-driven conversations. You'll work on real-time audio, global telephony, and developer tooling, collaborating directly with the founding team to define a category-leading product.\nKey Responsibilities\nBuild foundational architecture including prompt orchestration, testing frameworks, observability dashboards, and telephony integrations\nDesign scalable backend systems and DevOps workflows for reliable performance across millions of calls\nLead complex projects from architecture to production, owning delivery and monitoring\nCollaborate with product and design teams to create intuitive APIs for rapid customer onboarding\nSupport customer onboarding, troubleshoot issues, and translate feedback into product improvements\nRequirements\n2+ years backend development experience\nCS, CE, or EE degree or equivalent practical experience\nOwnership mindset with passion for impactful software\nThrives in fast-paced, ambiguous environments with strong problem-solving skills\nClear communication and cross-functional collaboration abilities\nBonus: Startup experience and cloud infrastructure/DevOps knowledge\nCompensation & Benefits\nSalary: $200K - $280K\nEquity: 0.25% - 0.45%\n Schedule: Full-time, 70 hrs/week (50 onsite + 20 remote, flexible hours)\n Location: Redwood City, CA\n100% medical, dental, vision coverage\nUnlimited meals and snacks\nGym and commute reimbursement\nVisa sponsorship available (H1B, TN, L-1, E-3, F-1, O-1)\nInterview Process\nOnline coding assessment (25-30 min)\nTechnical phone interviews (2 rounds focusing on data structures and algorithms)\nOnsite/virtual interviews: practical coding, system design, and automation","description_format":"text","description_chars":2064,"description_truncated":false,"requirements":{"experience_years_min":2,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Equity"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-10-13T03:57:46Z"}],"visa":[],"liveness":{"score":5,"band":"cold","label":"Long shot","p_open":1,"p_active":0.184,"p_room":0.28,"age_days":369,"expected_fill_days":31,"reasons":["conf:1","stale_co","ghost","win:tail","crowd:"],"computed_at":"2026-10-13T05:45:00Z"},"pay":{"stated_usd_annual":280000,"is_top_pay":true},"html_url":"https://alion.io/job/syndesus-sr-founding-backend-engineer","json_url":"https://alion.io/job/syndesus-sr-founding-backend-engineer.json","meta":{"generated_at":"2026-10-13T12:59:53Z","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":20209,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-14T00:00:00Z"}},"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":4420272},"rest":"https://alion.io/mcp/rest/get_company?id=4420272"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fsyndesus-sr-founding-backend-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%2Fsyndesus-sr-founding-backend-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%2Fsyndesus-sr-founding-backend-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/syndesus-sr-founding-backend-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fsyndesus-sr-founding-backend-engineer"}]}