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22 questions in the library. A source association does not guarantee a future interview question.
Behavioral and leadership · Coding · Machine learning · System design
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Showing 1–22
Physical stock and digital records must agree while workers receive, move, pick, and pack goods at the same time.
Companies: Coupang, Amazon, Procore
concurrency · inventory · physical-reconciliation · request-retries
Last reported Oct 2026
Find the minimum integer eating speed k such that the total hours required (sum over piles of ceil(piles[i]/k)) is ≤ h; because the required hours…
Companies: Coupang, Amazon, Bloomberg, DoorDash +6
Array · Binary Search
Last reported Oct 2026
Companies: Coupang, DoorDash, Google, Meta +1
Last reported Oct 2026
Companies: Coupang, Amazon, Anduril, Assort +9
Last reported Oct 2026
Design a scalable cloud storage service that allows users to upload, download, and manage files with high availability and durability. The system should support features…
Companies: Coupang, Amazon, Cohesity, Databricks +3
Last reported Oct 2026
Async processing with durable queues, per-channel isolation, retries/DLQ, at-least-once + idempotency, outbox, priorities.
Companies: Coupang, Airbnb, Amazon, Autodesk +24
async-processing · idempotency · outbox-pattern · queues
Last reported Sep 2026
Design a rate limiting system that can control the number of requests a user or client can make within a specified time window, preventing abuse…
Companies: Coupang, Amazon, Apple, Cohesity +3
Last reported Sep 2026
Contention on scarce inventory: seat holds with TTL, locking/optimistic concurrency, payments, flash-sale traffic and virtual queues.
Companies: Coupang, Agoda, Airwallex, Amazon +15
concurrency · idempotency · load-shedding · locking
Last reported Sep 2026
Design a simplified stock trading platform that supports limit orders for buying and selling stocks, with basic portfolio tracking capabilities at small scale (100 writes…
Companies: Coupang, Block, Coinbase, Databricks +7
System Design
Last reported Aug 2026
Design an eBay-like e-commerce platform that allows users to view products, manage shopping carts, place orders, complete checkout, and process purchases.
Companies: Coupang, eBay, Goldman Sachs, Meta +4
Last reported Aug 2026
Given an array of n integers, return the element that appears more than ⌊n/2⌋ times (the majority element is guaranteed to exist). The goal is…
Companies: Coupang, Amazon, Bloomberg, Google +1
Array · Boyer–Moore Majority Vote Algorithm · Counting · Divide and Conquer
Last reported Aug 2026
Given a grid with buildings (1), empty land (0), and obstacles (2), find an empty cell that minimizes the sum of shortest (Manhattan) path distances…
Companies: Coupang, Amazon, DoorDash, Goldman Sachs +2
Array · Breadth-First Search · Matrix
Last reported Aug 2026
Given an n x n symmetric adjacency matrix where isConnected[i][j]=1 denotes a direct undirected edge between cities, count the number of connected components (provinces) formed…
Companies: Coupang, Amazon, Uber
Breadth-First Search · Depth-First Search · Graph Theory · Union-Find
Last reported Aug 2026
Choose exactly k cards from either end of an array to maximize the sum; equivalently, remove a contiguous subarray of length n−k with minimum sum…
Companies: Coupang
Last reported Aug 2026
Design a time-based key-value store that records multiple values per key with timestamps and returns the value whose timestamp is the largest <= the queried…
Companies: Coupang, Amazon, Anthropic, Apple +8
Binary Search · Design · Hash Table · String
Last reported Aug 2026
Given two people's lists of available time intervals and a required meeting duration, find the earliest time interval where both are free for at least…
Companies: Coupang, Microsoft, Uber
Last reported Jul 2026
Given a JSON input containing a user's cart context and a list of promotion rules with conditions (e.g., EQUAL, GREATER_THAN), evaluate which promotions apply and…
Companies: Coupang
Last reported Jul 2026
Design an in-memory hierarchical file system that supports path parsing and operations like mkdir, ls, addContentToFile (append/create), and readContentFromFile, requiring you…
Companies: Coupang, Anchorage Digital, Capital One, Datadog +5
Design · Hash Table · Sorting · String
Last reported Jun 2026
Implement a Twitter class that supports posting tweets, following/unfollowing users, and retrieving the 10 most recent tweet IDs in a user's news feed. The core…
Companies: Coupang, Google, Headout
Last reported Jun 2026
Decode a string containing nested repeat patterns of the form k[encoded_string], expanding each bracketed segment k times (k may be multi-digit) possibly with multiple nesting…
Companies: Coupang, Bloomberg, Google, Microsoft +4
Recursion · Stack · String
Last reported Jun 2026
Given repeating bus routes and start/target stops, find the minimum number of bus rides required to go from source to target (or -1 if impossible)…
Companies: Coupang, Amazon, Bloomberg, PayPal +3
Array · Breadth-First Search · Hash Table
Last reported Oct 2025
Companies: Coupang
Feature Engineering · Supervised Learning