Join River as a Product Engineer to build AI voice agents that qualify leads and perform live product demos. You will own the full stack, from real-time backend services to LLM-driven browser automation. This is a founding-team role for an entrepreneurial engineer who wants to ship code daily and work directly with second-time founders.
Product Engineer (Full-Stack) at River
River is hiring a Product Engineer in NYC to build AI voice agents that can demo software and close deals autonomously. Backed by the founders of Ramp and Kalshi, River is a high-growth startup where you’ll work directly with second-time founders. We are looking for future founders with 2.5–5 years of elite experience and a Tier-1 academic background. If you want to ship LLM-powered workflows and browser automation code that runs in real sales calls within days, this is the ultimate apprenticeship for your own future startup journey.
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Location
New York, United States
Compensation
$150k-$190k + Equity
Company
River
Role overview
AI Sales
River builds AI voice agents that sell. Backed the founders of Ramp and Kalshi.
What you will do
- Develop backend services and APIs to manage live call session states, complex integrations, and real-time data pipelines.
- Architect LLM-powered workflows and browser-use agents capable of navigating new products and complex UIs during live customer demos.
- Build data enrichment pipelines to provide AI agents with deep prospect context before calls commence, while shipping high-quality Next.js/React UI.
Who this is a fit for
- 2.5–5 years of experience at breakout startups or top-tier AI companies, demonstrating high-bar engineering standards and entrepreneurial proof-of-work.
- Degree in Computer Science or an adjacent field from a global Tier-1 university, such as MIT, Stanford, CMU, IIT, or Imperial.
- Proficiency in TypeScript/Node.js and React, with a proven track record of building production applications using LLM APIs and AI-native tooling.
Why this role is remarkable
- Direct apprenticeship with second-time founders who previously exited their first startup, offering a high-speed path to becoming a future founder.
- Backed by an elite roster of investors including Shorooq and the founders of Ramp, Kalshi, and JumpCloud, with compounding weekly revenue.
- Work on bleeding-edge AI agents that navigate complex UIs and conduct live sales calls via browser-use and real-time voice technology.
How Jack & Jill work together
I get to know what you’re great at, then find roles you’d never find yourself.Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what you want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.
I recruit from Jack’s network and make the intro when I spot a great match.And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.
Jack gets to know what you're great at and what you want next, then searches 15 million jobs daily and helps you discover roles at companies like this.
Meet Jack
What happens next?
Jack’s an AI agent for job searching and career coaching. He works for you.
Jill is the AI recruiter working for the company. She recruits from Jack’s network.
If your profile’s a match and River wants to meet, Jill will make the intro. In the meantime, Jack will send you excellent alternatives.