We build AI voice agents that run live B2B sales calls — real-time voice, browser-driven product demos, automated follow-up. We're pre-seed, backed by the founders of Ramp, Kalshi, and JumpCloud, revenue is on, and demand is already outpacing what we can serve. It's a genuinely fun problem, and we'd love to find the right people to build it with.
We're hiring two founding engineers. To save everyone's time, here's what the role really needs — if a few of these are a strong yes, we'd love to hear from you:
NYC-based and up for working in person (5 days). We're not able to do relocation or visa sponsorship right now. TypeScript/Node as your main production stack — the one you actually ship in day to day. You've shipped real software that real people used — something in production, with revenue, or a startup you built (not tutorials or coursework). You've built something real with LLM APIs. You like owning things end to end — finding the problem and fixing it without waiting for a spec.
Two levels:
Founding Backend Engineer (5+ yrs): real-time/streaming depth (WebRTC, voice, low-latency), plus infra and reliability ownership. Founding Product Engineer (2–4 yrs): frontend-leaning (React/Next.js), customer-facing, CS degree or equivalent standout shipped work.
No need for a formal resume — just send a link to something you're proud of that real people used, and a line on what you owned. We read every one.
River builds voice AI agents for B2B comapnies. Our agent talks with prospects in real time, answers hard questions, and demos the product by actually controlling a browser while it speaks. Every call runs on a sub-second loop: speech, a rendered avatar, several LLMs, and a live browser-use agent, in front of real buyers. $2M pre-seed backed by founders of Ramp, Kalshi, and JumpCloud.
Hiring two roles:
Founding Engineer (5+ yrs): own the live-call pipeline (real-time voice, avatar, browser streaming) and the infra behind it. Looking for strong backend/infra plus real-time experience (WebRTC, voice/video, websockets). Stack: TypeScript, Node, Next.js, Postgres, Redis, LiveKit.
Product Engineer, full-stack (1-3 yrs or exceptional projects): build the services behind live calls, LLM workflows, and the browser-use agent that runs demos. Backend-leaning, TypeScript.
Both on-site in NYC, working directly with the founders. Try the product yourself at rivergtm.com/start
Email me (co-founder/CEO): [email protected]
The website being static is the real failure mode, not the absence of one.
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