Problem database last updated: June 20, 2025
9 problems · 1 Easy, 7 Medium, 1 Hard · Ranked #166 of 458
1 Easy
11% · avg 23%
7 Medium
78% · avg 59%
1 Hard
11% · avg 18%
Based on 9 reported problems, Coinbase interviews are in line with industry averages - 11% Hard vs 18% overall. The majority (78%) of questions are Medium difficulty, which is typical for companies that want to see solid fundamentals without excessive trick questions.
Compared to the industry average, Coinbase puts unusual emphasis on simulation (33.3% of problems, 7.7x the industry average), design (22.2% of problems, 3.8x the industry average), binary-search (22.2% of problems, 2.5x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (77.8%), string (55.6%), hash-table (44.4%), simulation (33.3%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Simple Bank System You have been tasked with writing a program for a popular bank that will automate all its incoming transactions (transfer, deposit, and withdraw). The bank has... | Medium | Very Likely | arrayhash-tabledesign | Solve |
Time Based Key-Value Store Design a time-based key-value data structure that can store multiple values for the same key at different time stamps and retrieve the key's value at a certain... | Medium | Very Likely | hash-tablestringbinary-search | Solve |
Decode the Message You are given the strings key and message, which represent a cipher key and a secret message, respectively. The steps to decode message are as follows: | Easy | Very Likely | hash-tablestring | Solve |
Text Justification Given an array of strings words and a width maxWidth, format the text such that each line has exactly maxWidth characters and is fully (left and right) justifie... | Hard | Likely | arraystringsimulation | Solve |
Check if There is a Valid Partition For The Array You are given a 0-indexed integer array nums. You have to partition the array into one or more contiguous subarrays. | Medium | Likely | arraydynamic-programming | Solve |
Random Pick with Weight You are given a 0-indexed array of positive integers w where w[i] describes the weight of the ith index. | Medium | Likely | arraymathbinary-search | Solve |
Evaluate Division You are given an array of variable pairs equations and an array of real numbers values, where equations[i] = [Ai, Bi] and values[i] represent the equation Ai /... | Medium | Likely | arraystringdepth-first-search | Solve |
Find the Length of the Longest Common Prefix You are given two arrays with positive integers arr1 and arr2. | Medium | Likely | arrayhash-tablestring | Solve |
Number of Orders in the Backlog You are given a 2D integer array orders, where each orders[i] = [pricei, amounti, orderTypei] denotes that amounti orders have been placed of type orderTypei at... | Medium | Likely | arrayheap-priority-queuesimulation | Solve |
Simple Bank System
SolveYou have been tasked with writing a program for a popular bank that will automate all its incoming transactions (transfer, deposit, and withdraw). The bank has...
Time Based Key-Value Store
SolveDesign a time-based key-value data structure that can store multiple values for the same key at different time stamps and retrieve the key's value at a certain...
Decode the Message
SolveYou are given the strings key and message, which represent a cipher key and a secret message, respectively. The steps to decode message are as follows:
Text Justification
SolveGiven an array of strings words and a width maxWidth, format the text such that each line has exactly maxWidth characters and is fully (left and right) justifie...
Check if There is a Valid Partition For The Array
SolveYou are given a 0-indexed integer array nums. You have to partition the array into one or more contiguous subarrays.
Random Pick with Weight
SolveYou are given a 0-indexed array of positive integers w where w[i] describes the weight of the ith index.
Evaluate Division
SolveYou are given an array of variable pairs equations and an array of real numbers values, where equations[i] = [Ai, Bi] and values[i] represent the equation Ai /...
Find the Length of the Longest Common Prefix
SolveYou are given two arrays with positive integers arr1 and arr2.
Number of Orders in the Backlog
SolveYou are given a 2D integer array orders, where each orders[i] = [pricei, amounti, orderTypei] denotes that amounti orders have been placed of type orderTypei at...
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Coinbase interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Coinbase interviews focus heavily on array, string, hash-table problems. If you're short on time, these are the categories to prioritize. The problems on this page are sorted by frequency, so start from the top and work your way down.
Beyond solving problems, practice explaining your approach. Coinbase interviewers care about your thought process - how you break down a problem, consider edge cases, and evaluate tradeoffs between solutions. A clean O(n) solution you can explain clearly beats an O(log n) solution you can't articulate.
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Coinbase has been reported to ask 9 distinct coding problems. The most common topics are array, string, hash-table. 1 are Easy difficulty, 7 are Medium, and 1 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 9 reported problems, Coinbase interviews are in line with industry averages - 11% Hard vs 18% overall. 78% of questions are Medium difficulty. Focus on the high-frequency Medium problems first, then work through the Hard ones.
Start with the highest-frequency problems listed on this page. Focus on the core topics: array, string, hash-table. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
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