In progressOnsite

Market Data API Design Round, Expecting a Rejection

RobinhoodSoftware Engineer · Onsite · Oct 2026

Design the Robinhood Marketdata API GET /quotes/{symbol}/live: real-time quote, ~10M qps GET /quotes/{symbol}/historical?range=(1d,1m,1y): historical range, ~1M qps They gave me a data source, NASDAQ Last Sale: two independent, redundant long-lived TCP connections (Conn A/B); about 7,000 symbols; peak of ~100k trades/s on each connection; 6.5 trading hours per day. Message format: symbol (4-5 ASC…

Shared by a candidate · reported Oct 2026. Interview formats change; use it as a guide, not a script.