the coding round was domain specific: implemented a simplified merkle tree verification. given a leaf hash and a proof (list of sibling hashes), verify the leaf is in the tree. then extended it to handle batch verification for multiple leaves. not traditional LC but you need to understand hash trees. 40 minutes total. finished with 5 min to spare. system design was design a crypto exchange order matching engine. basically design a distributed order book

Coinbase senior - blockchain coding round

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the coding round was domain specific: implemented a simplified merkle tree verification.

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coinbase doing domain specific interviews is actually great. at least theyre testing relevant knowledge instead of asking you to reverse a linked list for a crypto job

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the order book system design is standard fintech. the key is: matching engine needs to be single-threaded for consistency, but the REST API layer can be distributed. separate the hot path from the cold path

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did they ask about MEV or front-running protection in the system design? thats the curveball coinbase loves to throw