Coinbase Interview Questions
Practice 135 real interview questions from Coinbase. Covers Coding & Algorithms, System Design, Analytics & Experimentation, Statistics & Math. For roles including Software Engineer, Data Scientist, Machine Learning Engineer, Product Manager.
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"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."
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"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."
"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."
"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."
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 a Coin-Constrained Jump Strategy
You are implementing an autopilot strategy for a simple side-scrolling jump game. A character moves forward automatically. On each game tick, your str...
Compute Total Manual Distance
A package must be delivered on a one-dimensional line from position 0 to position target. You are given an array stations, where each element is the p...
Implement a Flappy Bird Jump Agent
Implement a function should_jump(state) -> bool for a simplified Flappy Bird game. The bird has a fixed horizontal position bird_x and a vertical posi...
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 ...
Design a crypto trading web frontend
Design the front-end architecture for a retail cryptocurrency trading web app (like a spot exchange). Assume the product needs these core screens and ...
Design query pagination for large datasets
Scenario You are building an API that returns a paginated list of records from a very large dataset (millions+ rows). Clients can specify: - Filters (...
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 a task management system with TTL
Task Management System (in-memory) Design and implement an in-memory task management system that supports tasks, users, task assignment with TTL (time...
Implement cursor-based query pagination
You are building a small in-memory database that stores rows with the following fields: - id (string, unique) - score (integer) - payload (string) You...
Parse logs and generate NFT attributes
You are given two independent coding tasks. Task 1: Parse and group a log file by thread ID You are given a list of log lines (strings). Each line con...
Implement Plus One
Given an integer represented as an array of digits digits, where the most significant digit comes first, return the array representing the integer plu...
Design an Identity Trust Experiment
You are joining an Identity & Trust team at a consumer marketplace. The team wants to launch a new identity-verification badge that appears on seller ...
Design a food delivery system
Design a food delivery platform (similar to common restaurant delivery apps). Core user stories 1. Customers can browse restaurants/menus, place an or...
Select transactions to maximize fees under size
Problem: Max-fee block assembly You are given N transactions. Each transaction has: - id (unique) - size (positive integer) - fee (non-negative intege...
Implement local maxima, bagging, and k-means
You have 70 minutes for three programming tasks. Task 1 — Find local maxima Given an integer array a of length n (1 <= n <= 2e5), return all indices i...
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...
Design a bank account ledger
Design a Bank Account Ledger Service Context You are building the core ledger service for a fintech wallet/banking platform. The service must support ...
Design Identity-Trust A/B Test
You are interviewing for a Data Scientist role on an Identity & Trust team at a consumer product company. The team wants to launch a feature that stre...