The super-magical Wi-Fi landline for kids. No screens, no texting, no strangers — just real conversation with Grandma, besties, and contacts you approve. Plug in, twirl that cord, and time-travel to pure voice fun. Backed by Greylock.
About 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.
What they'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
More about this role
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.
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...
Browse similar: Startup jobs