Hiring: Product Engineer (Full-Stack) ($150k-$190k + Equity) at River Company: Jack & Jill Location: New York, NY Job Posted Time: 2026-09-17 10:45:16 Target Skills & Keywords : Data Pipeline, LLM, Next.js, Node.js, React, SaaS, TypeScript About the job Experience: •5 years of experience at breakout startups or top-tier AI companies, demonstrating high-bar engineering standards and entrepreneurial proof-of-work. Required Skills: •River is a pre-seed AI voice technology company backed by the founders of Ramp, Kalshi, and JumpCloud, building automated AI sellers for B2B SaaS teams. •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. •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. •Work on bleeding-edge AI agents that navigate complex UIs and conduct live sales calls via browser-use and real-time voice technology. •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. Qualifications: •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. •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. •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. Compensation: •$150,000 - $190,000 / year Interested candidates, please apply directly through the job posting on company's career page or try via AI auto apply on this platform. Don't miss this opportunity to join a forward-thinking team!