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Coinbase Coding Interview Questions

28 Coinbase coding interview problems with full optimal solutions — 16 easy, 9 medium, 3 hard. Every problem ships with multiple approaches (brute-force first, then the optimal), complexity tables for each, company-specific tips on what an Coinbase interviewer values, and a FAQ section.

Showing 6 problems of 28

  • #1easyfrequently asked

    1. Two Sum

    Given an array of integers and a target, return the indices of two numbers that add up to the target. Coinbase asks this as a warm-up to gauge whether you reach for hash maps over nested loops on the very first problem.

  • #2easyfrequently asked

    2. Valid Parentheses

    Determine if a string of brackets is balanced and properly nested. Coinbase uses this to test stack fundamentals — order-book matching engines lean on the same LIFO discipline.

  • #3easyfrequently asked

    3. Merge Two Sorted Lists

    Splice two sorted linked lists into one sorted list. Coinbase uses this to test pointer manipulation — a common building block when merging streams of order-book updates from different feeds.

  • #6easyfrequently asked

    6. Search Insert Position

    Given a sorted array, find the index where a target should be inserted to maintain order. Coinbase asks this because it's the building block for inserting a new limit order at the right price level in an order book.

  • #7easyfrequently asked

    7. Maximum Subarray

    Find the contiguous subarray with the largest sum. Coinbase asks this to test the local-vs-global pattern — the same shape shows up when finding the most profitable contiguous holding window in price data.

  • #9easyfrequently asked

    9. Merge Sorted Array

    Merge two sorted arrays in place, with nums1 sized large enough to hold both. Coinbase asks this because in-place merges show up everywhere in matching engines — the destination buffer is already allocated.

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Coinbase Coding Interview Questions — Full Solutions — InterviewChamp.AI