River Markets jobs, careers, and hiring context

Explore River Markets careers and hiring status. Find jobs at River Markets and official application links when roles are open. Funding stage: Seed. Headcount: 1-10. River Markets is a San Francisco-based prime brokerage for prediction markets, giving professional and institutional traders a single interface to route orders and aggregate liquidity across venues like Kalshi and Polymarket. The platform provides execution software, market data connectivity, a Python SDK, and risk tools for managing large cross-venue orders. Founded by ex-BlackRock and ex-Morgan Stanley quants, it launched in May 2026 and is a Y Combinator Spring 2026 company.

This page summarizes open roles, company profile signals, and official application paths so candidates can quickly evaluate fit before applying. Use the role list below to identify team focus, review location patterns, and jump to source listings. For broader comparison across the market, continue to the full company directory and jobs explorer.