Product Engineer ($150k-$190k + Equity) at River

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.

About the role

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.

This role is based in 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.

Responsibilities

• 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.

Requirements

• 2.5–5 years of experience shipping production-grade software.
• CS degree from a top-tier university or equivalent high-bar experience.
• Expert in TypeScript and Node.js with a strong backend focus.
• 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.

Pay

$150k–$190k + Equity