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129 questions in the library. A source association does not guarantee a future interview question.
Behavioral and leadership · Coding · Practical engineering · System design
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Showing 26–50
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: Bloomberg, Coupang, Google, Microsoft +4
Recursion · Stack · String
Last reported Aug 2026
Implement a song playlist data structure with methods to add and remove songs from the playlist.
Companies: Bloomberg, Amazon
Last reported Aug 2026
Design a data structure supporting insert(val), remove(val), and getRandom() — which returns a uniformly random existing element — with each operation in average O(1) time…
Companies: Bloomberg, Amazon, Apple, Citadel +7
Array · Design · Hash Table · Math
Last reported Aug 2026
Companies: Bloomberg, Amazon, Anduril, Assort +9
Last reported Aug 2026
Given an array of non-negative heights representing elevation bars of width 1, compute the total units of water that can be trapped between them after…
Companies: Bloomberg, Amazon, Goldman Sachs, Google +6
Array · Dynamic Programming · Monotonic Stack · Stack
Last reported Aug 2026
Design a system that efficiently retrieves top-k items (songs, videos, hashtags, etc.) based on user activity or engagement metrics within specified time windows. The system…
Companies: Bloomberg, Amazon, Atlassian, eBay +10
Last reported Jul 2026
Companies: Bloomberg
System Design
Last reported Jul 2026
Extend an existing codebase by writing tests to validate functionality. Refactor the implementation to detect and prevent duplicate processing.
Companies: Bloomberg, Aloe Identity
Last reported Jul 2026
Given a sorted list of words in an unknown alphabet, infer the relative ordering of characters by deriving precedence constraints between first differing letters, then…
Companies: Bloomberg, Amazon, Google, Intuit +3
Array · Breadth-First Search · Depth-First Search · Directed Acyclic Graph
Last reported Jul 2026
Companies: Bloomberg, Amazon, Arize Ai, Block +12
Last reported Jul 2026
Companies: Bloomberg, Airbnb, Amazon, Anduril +22
Project Deep Dive
Last reported Jul 2026
Design a live stock price ingestion system that allows users to view real-time stock prices and historical price graphs for any given stock symbol.
Companies: Bloomberg, Robinhood
Last reported Jul 2026
Async processing with durable queues, per-channel isolation, retries/DLQ, at-least-once + idempotency, outbox, priorities.
Companies: Bloomberg, Airbnb, Amazon, Autodesk +24
async-processing · idempotency · outbox-pattern · queues
Last reported Jul 2026
Compute F(n) defined by F(0)=0, F(1)=1 and F(n)=F(n-1)+F(n-2); return the nth Fibonacci number for 0 ≤ n ≤ 30. The task tests handling a simple…
Companies: Bloomberg
Last reported Jul 2026
Companies: Bloomberg, Amazon, Capital One, Microsoft +3
Last reported Jul 2026
Companies: Bloomberg, Apple, Atlassian, Coursera +7
Last reported Jul 2026
Companies: Bloomberg, Arize Ai, Reddit
Last reported Jul 2026
Design a real-time stock data streaming system that allows users to subscribe to live market data feeds, receive low-latency price updates, and process high-throughput…
Companies: Bloomberg, Citadel
Last reported Jul 2026
Simulate a Snake game on an m×n grid supporting move(direction): the snake advances, grows when it eats sequentially placed food (increasing score), and the game…
Companies: Bloomberg, Apple, Atlassian, Meta +1
Last reported Jul 2026
Given a list of logs each containing a user ID, TV show name, and episode watched, implement functions to: (1) process the input logs, and…
Companies: Bloomberg
Last reported Jul 2026
Photo delivery and social feeds: safe publication, celebrity fan-out, stable pagination, and high-volume interactions.
Companies: Bloomberg, Amazon, Datadog, DoorDash +9
content-delivery · feed-fanout · idempotency · media-storage
Last reported Jul 2026
Find all shortest sequences transforming beginWord to endWord by changing one letter at a time using only words from wordList; treat words as nodes in…
Companies: Bloomberg, Meta, Nielsen
Last reported Jun 2026
Given lists of accounts where each account has a name and emails, merge accounts that share any email by grouping connected emails (e.g., via union-find…
Companies: Bloomberg, Airbnb, Meta, Oracle +1
Array · Breadth-First Search · Depth-First Search · Hash Table
Last reported Jun 2026
Companies: Bloomberg, Adyen, Airbnb, Amazon +31
Last reported May 2026
Implement a rate limiting algorithm that accepts a unique key, a time period in seconds, and a maximum call count, and determines whether additional calls…
Companies: Bloomberg, Intuit, Microsoft, MongoDB
Last reported May 2026