Product Engineer (Full-Stack)

Pre-Seed AI Voice Agent Startup for B2B Sales • New York City (Hybrid)

Location

New York, NY — hybrid, 4 days a week in office

Compensation

$150k–$190k + 0.25–1% equity · NYC, 4 days in office

About the company

Our client is a pre-seed AI startup in New York, backed by the founders of several unicorns, building AI voice agents that run live B2B sales calls end to end. The agents qualify prospects, answer detailed product questions, demo the product live by driving a browser while they talk, and follow up until the deal closes. The company turned on revenue recently and scaled it sharply within days of launch, with more demand than they can currently serve. They are building core IP around browser use rather than orchestrating existing tools.

The role

This is the first engineering hire outside the founding team, and the seat is deliberately broad. You would build the backend services behind live AI sales calls, develop the browser-use agent that navigates and demos real products while the AI is speaking, and ship UI in Next.js and React where it is needed. You would work directly with design partners to shape the product, and with the founders daily. The team is small and explicitly wants individual contributors who make decisions without a product-manager layer.

What you'll do

Build backend services and APIs behind live AI sales calls — session state, integrations, data pipelines
Develop the browser-use agent that navigates and demos real products live while the AI talks
Work directly with design partners to shape the product and feed custom work back into core
Build LLM-powered workflows: prompts, tool use and the agentic flows the agent follows during live demos
Ship UI in Next.js and React where needed, watch real calls, and iterate fast

What we're looking for

These are hard requirements. Check each one that applies to you.

I'm a US citizen or a green card holder — this client is not open to any visa, transfers included
2–5 years of professional software engineering with production software I've shipped
Strong TypeScript and JavaScript, particularly on the backend — Node.js, Next.js and Postgres
Hands-on experience building with LLMs or real-time applications
I've shipped at a high-growth startup, or in Big Tech paired with genuine 0-to-1 work
High ownership — I find problems, make decisions and ship without hand-holding or a PM layer
I'm based in New York City or willing to relocate, and happy in the office 4 days a week
My track record shows real tenure rather than a pattern of short stints

Please note: every item above is a hard requirement for this role. Applications that don't meet all of them will be rejected. We recommend applying only if you check every box.

Don't check every box? No worries — submit your info here and we'll keep you in mind for roles that could be a better fit.

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Nice to have

Real-time systems experience — WebRTC, websockets or streaming
Browser automation or computer-use agent experience
Customer-facing engineering, building directly with design partners or customers
Experience in sales tech or GTM tooling
Active side projects or founder attempts with real users, revenue or traction

Tech stack

TypeScript and JavaScript throughout, with Node.js, Next.js and React, PostgreSQL and Redis behind them, and WebRTC, LLMs, browser automation and the Vercel AI SDK on the agent side.

Compensation & logistics

$150k–$190k base + 0.25–1% equity, with room to stretch for the right person
Hybrid in New York City — 4 days a week in office; you must be based in NYC or willing to relocate
Not open to any visas — candidates must be US citizens or green card holders; the client cannot sponsor or transfer
1–2 hires planned

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