robinhoods coding interview was domain-specific: 1. implement a limit order book. track bids and asks, match orders when bid >= ask 2. handle partial fills (order for 100 shares, only 60 available at the price) 3. add support for market orders all in one 60-minute session. progressively harder. got through part 2 cleanly, ran out of time on market orders

Robinhood backend - financial systems coding

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robinhood's coding interview was domain-specific: 1.

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order book implementation is the classic fintech interview question. the key data structure is two sorted maps - one for bids (descending) and one for asks (ascending)

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getting through part 2 in 60 min is solid. market orders are just "match at best available price" which is a small extension