I’m Antonin, co-founder and CTO of River Markets. Oscar (CEO) and I spent 3 years as quant in Hedge Funds and HFT shops. At nights and week end we started trading predictions markets for fun and built a trading infrastructure. We are now using this to build the prime brokerage and execution layer for prediction markets: the infrastructure professional and institutional traders need to access, trade, and manage risk across venues like Kalshi and Polymarket at scale.

We value ownership, speed, and a high technical bar. We expect to do more with fewer people than a team our size has any right to. We are currently fully connected to 3 exchanges, have 6 proprietary execution algorithms and already have paying users.