---
title: 'Senior VoIP Engineer at Tin Can'
canonical: 'https://feeny.ai/job/senior-voip-engineer-tin-can-seattle-w5dxw7d2wg59'
type: 'job'
last_seen: '2026-09-09'
---

# Senior VoIP Engineer at Tin Can

- **Company:** Tin Can
- **Location:** Seattle, WA
- **Compensation:** $175k–$195k
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-08-24
- **Last confirmed live:** 2026-09-09
- **Apply:** https://jobs.ashbyhq.com/tin-can/70915b13-ef73-4c5f-a20a-0ec63aa5f72e

## Job description

## ABOUT TIN CAN

Tin 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.

We’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.

## THE ROLE

A 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.

Our 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.

## WHAT YOU’LL DO

- Own our production SIP and media plane end to end — Kamailio, FreeSWITCH, and the carrier trunking behind every call to the outside world
- Be the reviewer of record for call-path changes, and author the SIP test scenarios that gate a voice change before it ships
- Write and maintain the Kamailio routing logic behind every call — dispatcher, registrar and usrloc tuning, htable, DMQ replication, TLS
- Build FreeSWITCH dialplans and integrations (ESL, mod_xml_curl, Lua, Sofia profiles), and keep call state correct across boxes, transfers, and NAT
- Produce the packet-level truth about call quality — MOS, jitter, packet loss, setup time — and make it trustworthy enough to alarm on
- Model and load-test call capacity — concurrent calls, calls per second, trunk headroom — against our holiday peak, using scenarios built on real call flows
- Extend the SIP and media layer into new countries as we expand, where codec support and emergency-calling rules change market to market
- Harden the signaling and media path: SIP over TLS, SRTP, rate limiting, toll-fraud prevention, and topology hiding
- Raise the team’s voice fluency: the documentation, runbooks, and reviews that make this stack legible to every engineer here

## WHAT WE’RE LOOKING FOR

- 5+ years building and operating real-time voice systems in production, with hands-on Kamailio and FreeSWITCH depth
- You 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
- You’ve debugged live production calls from a packet capture and a SIP trace to root cause
- You treat config as code and infrastructure as reproducible
- Fluency using AI as a multiplier across diagnosis, analysis, and testing
- A clear communicator who writes things down
- A collaborative, low-ego approach — everyone here sweeps the floor
- Bonus: rtpengine, Homer/HEP for capture and call-leg correlation, SIPp regression suites, Prometheus exporters for the voice plane, or STIR/SHAKEN and carrier interconnect
- Extra bonus: WebRTC internals (ICE, DTLS-SRTP, TURN) and bridging WebRTC to SIP

## WHY JOIN TIN CAN

- We’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.
- You’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.
- Small, 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.
- Room 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.

If 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.

## About Tin Can

## Company Overview
- **One-liner**: Tin Can builds a screen-free, Wi-Fi-enabled landline for kids that allows them to call approved contacts without the distractions of a smartphone.
- **Entity Type**: Private (Seed stage)
- **Headquarters**: Seattle, Washington, United States
- **Founded**: 2024
- **Founders**: Chet Kittleson, Max Blumen, and Graeme (last name not publicly available)

## Core Business
- **Primary industry**: Consumer Services / Kids’ Communication Hardware
- **Target customers**: B2C – parents of children aged 4–13 who want a safe, screen-free phone option
- **Mission**: “Bring back the freedom of the old-school landline, updated for today’s families.”

## Products & Services
- **[Tin Can Device](https://tincan.kids/)**: A custom-designed, Wi-Fi-connected landline handset with no screen, no apps, no camera, and no browser. It plugs into a wall and connects over Wi-Fi. Parents manage contacts and quiet hours via a companion mobile app.
- **[Can2Can Plan](https://tincan.kids/)**: Free unlimited calling between two Tin Cans, no subscription required.
- **[Party Line Plan](https://tincan.kids/)**: $9.99/month subscription that allows the child to call any regular phone number (grandparents, parents’ cells, etc.) in addition to other Tin Cans. Includes 911 emergency calling.
- **Parent App**: iOS/Android app for approving contacts, setting quiet hours, and managing Do Not Disturb schedules.

## Market Standing
- **Valuation**: Not publicly disclosed
- **Total Funding**: $5.75 M
  - Pre-Seed (May 2025): Led by PSL Ventures (9 investors)
  - Seed (Oct 2025): $3.5 M led by Data Tech Fund and PSL Ventures (8 investors)
- **Notable Investors**: PSL Ventures, Data Tech Fund, Greylock (participated in a prior round)
- **Growth Signals**: 
  - Used by families in 30+ U.S. states with zero paid marketing (organic word-of-mouth)
  - Headcount grew from ~2 to 27 employees (+1,167% YoY)
  - Received 40 early prototypes hand-installed in one Seattle neighborhood; demand spread rapidly

## Competitive Advantages
- **True screen-free experience**: No apps, no texts, no browser – pure voice calling. Eliminates the risks of smartphones (social media, addictive apps, stranger danger).
- **Parental control without complexity**: Parents manage everything via a simple app; kids get independence without internet access.
- **Wi-Fi landline model**: Works with existing home Wi-Fi, no need for a cellular plan or smartphone.
- **Emergency calling**: 911 always available, even without a subscription.
- **Free Can2Can network**: Encourages peer-to-peer calling among friends who also have Tin Cans.

## Strategic Focus
- Scaling production of the fully custom hardware (designed from the ground up)
- Expanding the user base beyond the initial 30 states through word-of-mouth and targeted marketing
- Building out the team (active job postings for engineering, design, marketing, and customer experience)
- Maintaining a mission-driven culture focused on intentional technology for kids

## Why Work Here
- **Culture**: Mission-driven startup focused on real human connection and “keeping childhood full of imagination, not notifications.” Team is passionate about intentional tech.
- **Work environment**: Hybrid/in-office options available. HQ is in Seattle with an in-office workspace; some roles are remote or hybrid.
- **Growth opportunity**: Early-stage company (27 employees) with rapid growth – employees can have outsized impact.
- **Perks**: Not detailed publicly, but typical startup perks (equity, flexible schedule) likely. The company emphasizes a “no surprises” approach to its product.
- **Team composition**: Small, cross-functional team with specialists in customer service, design, engineering, and operations.

## Sources
1. [tincan.kids](https://tincan.kids/)
2. [tincan.kids - About page](https://tincan.kids/pages/about-tin-can)
3. [Built In - Tin Can Careers](https://builtin.com/company/tin-can)
4. [LinkedIn - Tin Can](https://www.linkedin.com/company/tincankids)
5. [Jobs page - Ashby](https://jobs.ashbyhq.com/tin-can)

## Other roles at Tin Can

- [PR Coordinator](https://feeny.ai/job/pr-coordinator-tin-can-seattle-mvqpms9y8k9p) — Seattle, WA
- [International Expansion Lead](https://feeny.ai/job/international-expansion-lead-tin-can-seattle-pj7hjmxgbvzy) — Seattle, WA
- [Senior Software Engineer, Reliability](https://feeny.ai/job/senior-software-engineer-reliability-tin-can-seattle-ahjjhenhwe6t) — Seattle, WA
- [Growth and Brand Engineer](https://feeny.ai/job/growth-and-brand-engineer-tin-can-seattle-2wpwwc20rty2) — Seattle, WA
- [Lifecycle Marketing Manager](https://feeny.ai/job/lifecycle-marketing-manager-tin-can-seattle-3cpz78792ak9) — Seattle, WA
- [Senior Product Designer, Acquisition & Conversion](https://feeny.ai/job/senior-product-designer-acquisition-conversion-tin-can-seattle-2he14k0estfj) — Seattle, WA
- [Principal Product Designer, Core Experience](https://feeny.ai/job/principal-product-designer-core-experience-tin-can-seattle-p18sm7qhpmd3) — Seattle, WA
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- [Associate Creative Director](https://feeny.ai/job/associate-creative-director-tin-can-seattle-e2rzq8yhx458) — Seattle, WA