About the role
AgentPhone gives AI agents phone numbers. Voice, SMS, and iMessage through one API.
The oldest address on the internet is a phone number. Every business, every bank, every human still runs on it. But the entire telephony stack was built for humans dialing humans. AI agents are about to make and receive millions of calls and texts, and the infrastructure underneath them was never designed for that.
We're building it. Over 100 companies use AgentPhone today to provision numbers, place and receive calls, send texts and iMessages, and stay compliant with carrier regulations, all from a single API and MCP server. We're backed by Y Combinator (P26) and investors including Singularity Capital, Leonis Capital, Rebel Fund, and Pioneer Fund.
What You'll Do:
- Build and scale core telephony infrastructure: SIP trunking, real-time voice (LiveKit), call routing, and media handling
- Own messaging delivery across SMS, iMessage, and RCS, including deliverability debugging when carriers silently drop traffic
- Ship developer-facing surfaces: our API, SDKs, MCP server, webhooks, and dashboard
- Build compliance infrastructure (A2P 10DLC, TCR registration, KYC) so customers don't have to think about it
- Talk to customers directly and turn their problems into features, sometimes the same day
- Set the engineering foundations (testing, CI/CD, observability, on-call) that every future hire inherits
Who You Are:
- A go-getter. You see a problem, you own it, you fix it, no one has to ask
- You use AI tools extremely well and move faster with them than most engineers think possible
- You've shipped real software that people actually use
- Comfortable talking to customers directly and turning their problems into product
- You move fast in ambiguity and take full ownership without process or specs
- No telephony experience required. We'll teach you everything, or you'll figure it out with us
Nice to Have:
- Experience with telephony, VoIP, SIP, WebRTC, or messaging infrastructure (Twilio, LiveKit, Bandwidth, etc.)
- You've built AI agents or worked with LLM APIs, MCP, or voice AI stacks
- You were one of the first engineers at a seed or Series A startup
- Developer tools or API product experience
About AgentPhone
AgentPhone gives every AI agent its own dedicated phone number, enabling autonomous agents to call businesses, send and receive SMS/iMessage/RCS/WhatsApp, and complete real-world tasks without human intermediaries. The company abstracts away telecom compliance complexities (STIR/SHAKEN, A2P 10DLC, carrier registration) into a single developer API and unified webhook. Founded in 2026 and backed by Y Combinator's Spring 2026 (P26) batch, AgentPhone targets developers and engineering teams building autonomous AI agents. Its thesis is that the $2 trillion global telecom industry was built for humans, and AI agents are currently blocked from acting in the real world because they lack a phone identity.
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Job details
Salary
$140,000 - $250,000
Equity
0.25% - 2%
Location
New York, San Francisco
Experience
0+ years
Funding
Total raised
$500K
Last stage
Seed
Investors
What happens next.
No applications, no recruiter spam. Just the intro.
Confirm the fit
A few questions to make sure this role is the right shape for you. Two minutes.
I pitch you to the company
I write the intro, send it to the founder, and handle the back-and-forth.
A meeting lands on your calendar
If they’re a yes, I book the chat. You show up — that’s the whole job-hunt.