Product Engineer

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers. She will pick the best candidates from Jack's network. The next step is to speak to Jack. Job Title Product Engineer Salary $150k-$190k + Equity Company Description River is a $2M pre-seed AI startup backed by Shorooq and the founders of Ramp and Kalshi, building autonomous voice agents that sell. Their agents join video calls in real-time, demo products via browser automation, and handle follow-ups, providing businesses with a full-stack AI seller available 24/7 to close deals. Job Description 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. Location New York, USA 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. 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. The ideal candidate 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. Who are Jack & Jill? 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. 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. How does this work? 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 it's a match and the company wants to meet you, they'll make the intro. In the meantime, if you'd like, Jack will send you excellent alternatives. We never post fake jobs This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network. Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description. We appreciate this can make them look a bit suspect, but there isn't much we can do about it. Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.