As the first engineering hire at River, you will build the product across the entire stack, focusing on the backend services powering live AI calls. You’ll develop LLM workflows, browser-use agents, and data enrichment pipelines. Working directly with the founders, you will ship daily and see your work impact real sales calls immediately.
Product Engineer at River
Join River as the first engineering hire to build AI voice agents that automate the entire sales cycle—from joining video calls and sharing screens to closing deals. Backed by a $2M pre-seed from Shorooq and the founders of Ramp and Kalshi, you'll work directly with serial founders in New York to scale a product that is already generating revenue and seeing massive demand. This is a high-ownership role for a full-stack builder ready to ship daily and see their work live in real-time sales calls.
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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 for live calls, managing session states, complex integrations, and real-time data pipelines.
- Build and refine LLM-powered workflows, including prompt engineering and tool-use logic that guides the agent through complex live product demos.
- Engineer a browser-use agent using Playwright and CDP to navigate and control product UIs autonomously during live customer interactions.
Who this is a fit for
- Possesses 2.5–5 years of experience shipping production-grade software and a CS degree from a top-tier university or equivalent high-bar experience.
- Expert in TypeScript and Node.js with a strong backend focus, plus proficiency in React, Next.js, and integrating LLM APIs into real products.
- Demonstrates high ownership and product sense, capable of identifying problems and shipping solutions independently without the need for a Project Manager.
Why this role is remarkable
- Join as the first engineering hire outside the founding team, reporting directly to serial entrepreneurs who successfully sold their previous company.
- High-velocity environment where you ship to production daily and witness your code driving live, real-time AI sales demonstrations within the same week.
- Backed by elite investors including Shorooq and founders of Ramp and Kalshi, with revenue already live and demand exceeding current capacity.
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.
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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.