{"id":126112,"url":"https://alion.io/job/tincan-senior-voip-engineer","title":"Senior VoIP Engineer","company":{"id":11008,"name":"Tin Can","domain":"tincan.kids","url":"https://alion.io/company/tincan","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":null},"role":"DevOps","role_family":"DevOps","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":["Seattle, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":175000,"max":195000,"currency":"USD","period":"year","gross":null,"usd_annual":195000},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AWS","optional":false},{"name":"Lua","optional":false},{"name":"Prometheus","optional":false},{"name":"WebRTC","optional":false}],"status":"live","first_seen_at":"2026-08-24T04:27:17Z","employer_posted_date":"2026-08-24","last_verified_at":"2026-10-18T07:55:53Z","board_verified":true,"closed_at":null,"days_open":55,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":55},"description":"About Tin Can\nTin Can is building a safer, simpler way for kids to connect - without smartphones. We’re creating screen-free, delightful devices and services that let families call the people who matter most, free from the noise of today’s digital world.\nWe’re building a bold, authentic, nostalgic, and kinda quirky brand that resonates with folks who want something simpler & better for their kids than the tech-infused lives we’re currently living (and who have a sense of humor about it). As we gear up to scale to thousands of families, we’re ready to bring on an engineer to help make it happen.\nThe Role\nA call either connects or it doesn’t - there’s no partial credit when a kid picks up a Tin Can to reach Grandma, or to dial 911. We’re hiring a Senior VoIP Engineer to own the SIP and media plane that carries every one of those calls: how it routes, how it sounds, and how we know it works. It’s the first role dedicated entirely to that stack.\nOur production stack is Kamailio (SIP proxy and registrar) and FreeSWITCH (media and voicemail), running on AWS across carrier trunks and our own device fleet. This is a deeply hands-on role: routing logic, dial plans, and packet captures every day. You’ll report to the Head of Engineering and own the call itself. You’ll set the direction for how the voice plane is designed and tuned and when a registration flaps at 3am, you’re the person who can go from a SIP trace to root cause and out the other side with a fix.\nWhat You’ll Do\nOwn our production SIP and media plane end to end - Kamailio, FreeSWITCH, and the carrier trunking behind every call to the outside world\n\nBe the reviewer of record for call-path changes, and author the SIP test scenarios that gate a voice change before it ships\n\nWrite and maintain the Kamailio routing logic behind every call - dispatcher, registrar and usrloc tuning, htable, DMQ replication, TLS\n\nBuild FreeSWITCH dialplans and integrations (ESL, mod_xml_curl, Lua, Sofia profiles), and keep call state correct across boxes, transfers, and NAT\n\nProduce the packet-level truth about call quality - MOS, jitter, packet loss, setup time - and make it trustworthy enough to alarm on\n\nModel and load-test call capacity - concurrent calls, calls per second, trunk headroom - against our holiday peak, using scenarios built on real call flows\n\nExtend the SIP and media layer into new countries as we expand, where codec support and emergency-calling rules change market to market\n\nHarden the signaling and media path: SIP over TLS, SRTP, rate limiting, toll-fraud prevention, and topology hiding\n\nRaise the team’s voice fluency: the documentation, runbooks, and reviews that make this stack legible to every engineer here\n\nWhat We’re Looking For\n5+ years building and operating real-time voice systems in production, with hands-on Kamailio and FreeSWITCH depth\n\nYou can hold your own on SIP and RTP: location services, dialog state, transfers, Path routing, NAT traversal, and what happens to media when a packet arrives late\n\nYou’ve debugged live production calls from a packet capture and a SIP trace to root cause\n\nYou treat config as code and infrastructure as reproducible\n\nFluency using AI as a multiplier across diagnosis, analysis, and testing\n\nA clear communicator who writes things down\n\nA collaborative, low-ego approach - everyone here sweeps the floor\n\nBonus: rtpengine, Homer/HEP for capture and call-leg correlation, SIPp regression suites, Prometheus exporters for the voice plane, or STIR/SHAKEN and carrier interconnect\n\nExtra bonus: WebRTC internals (ICE, DTLS-SRTP, TURN) and bridging WebRTC to SIP\n\nWhy Join Tin Can\nWe’re building tech that protects childhood: We’re on a quest to give kids a more analog childhood - one with real conversations, real connection, and way less screen time. No doomscrolling, data mining, or dopamine traps - just a simpler, better way for kids to stay in touch. This is a rare opportunity to build something that truly matters.\n\nYou’ll own the call path outright: This is the first role dedicated entirely to our voice stack - the systems that decide whether a kid’s call connects and how it sounds. You’ll set the direction for how calling works as we scale.\n\nSmall, high-trust team: Every company says “team,” but at Tin Can it means something different. We’re a small, mission-driven group that genuinely has each other’s backs - professionally and personally. You’ll be joining a tight-knit crew where your ideas and instincts matter from day one.\n\nRoom to explore, not just execute: You’ll have the space to challenge assumptions, solve hard problems, and build systems that reflect our values of trust, simplicity, and care.\n\nIf you’re excited by the idea of owning the systems that carry a kid’s voice to the people who matter most, and making them so dependable that nobody has to think about them, we’d love to meet you.","description_format":"text","description_chars":4870,"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":["Smart Home Devices"],"lifecycle":[{"event":"open","at":"2026-08-24T04:27:17Z"}],"visa":[],"liveness":{"score":60,"band":"ok","label":"Likely open","p_open":1,"p_active":0.794,"p_room":0.75,"age_days":54,"expected_fill_days":56,"reasons":["conf:3","velocity","win:late"],"computed_at":"2026-10-17T05:46:00Z"},"pay":{"stated_usd_annual":195000,"is_top_pay":true},"html_url":"https://alion.io/job/tincan-senior-voip-engineer","json_url":"https://alion.io/job/tincan-senior-voip-engineer.json","meta":{"generated_at":"2026-10-18T09:17:47Z","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":13862,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-19T00:00:00Z"}},"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":11008},"rest":"https://alion.io/mcp/rest/get_company?id=11008"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Ftincan-senior-voip-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%2Ftincan-senior-voip-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%2Ftincan-senior-voip-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/tincan-senior-voip-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Ftincan-senior-voip-engineer"}]}