Coinbase Software Engineer Coding & Algorithms Interview Questions
Practice 39 real Coding & Algorithms interview questions for Software Engineer roles at Coinbase.
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Solve restaurant path and order event tasks
You are given two independent coding tasks. Task 1: Shortest paths in a restaurant grid Context: A restaurant is represented as a 2D grid. The waiter ...
Paginate forward and backward through results
You are asked to extend a basic pagination system to support forward and backward navigation, similar to a cursor-based API. You are given: - A zero-i...
Implement bank balance operations
Question Design and implement a Bank account class that supports the operations Deposit(amount), Withdraw(amount), and CashBack(percent). Ensure balan...
Implement an In-Memory Database
Design and implement an in-memory database that stores records by key. Each record is a map from field to integer value. Implement the following funct...
Implement Game Physics and Block Mining
You are given two independent coding tasks from the same interview category. Solve both. Task A: Flappy-Bird-Style Jump Boundary Function Implement a ...
Maximize block fee with transaction selection
You are given N transactions. Each transaction has: - id (unique identifier) - size (positive integer) - fee (positive integer) You are building a blo...
Design an in-memory banking system
Implement an in-memory banking system (e.g., in Java) that supports the following operations on user accounts. Assume user IDs are unique strings and ...
Implement cloud storage with quotas and compression
Problem Implement an in-memory cloud storage service that supports multiple users, per-user storage quotas, changing quotas with eviction, and file co...
Implement basic pagination for a list
You are given: - A zero-indexed array of items items (you can assume it fits in memory). - An integer pageSize > 0. Design and implement a pagination ...
Implement a versioned recipe management system
You are asked to implement an in-memory Recipe Management System (similar in difficulty to a simple banking/in-memory DB exercise). The system support...
Design an in-memory database with TTL and backups
You are asked to implement a small in-memory “database” that evolves across 4 parts. In each part you may reuse your previous code and only add/extend...
Implement banking ops: transfer, top-k, cashback, merge
Design and implement an in-memory banking system that supports: ( 1) CreateAccount(id, initialBalance) and Transfer(fromId, toId, amount) with validat...
Generate Weighted Random NFTs with Updates
You manage k NFT types, each with a positive integer rarity weight w[i]. Implement a minter: constructor(w) builds any needed structures in O(k); mint...
Implement a Simple Banking Ledger
Design and implement a banking ledger for n accounts labeled 1..n with initial balances. Provide an API: deposit(id, amount) -> bool, withdraw(id, amo...
Maximize profit with transaction fees
You are given an array prices where prices[i] is the price of a stock on day i and an integer fee representing the commission charged when you sell. Y...
Implement top-K over a stream
Given a high-volume stream of events (e.g., account IDs from new account openings), design and implement a data structure that supports: ( 1) insertin...
Recommend movies by shared ratings
Recommend movies by shared ratings Write a function recommendations(user, ratings) that returns a list of movies to recommend to the given user based ...
Count users over n connections
Count users over n connections Given a stream of relationship events in the form [[user_a, user_b, op], ...], where op ∈ {"connect", "disconnect"}, tr...
Implement bank account with cashback
Implement a bank account processor. Given an initial non-negative integer balance B and a list of operations (n up to 1e 5), apply each operation in o...