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430 questions in the library. A source association does not guarantee a future interview question.
Behavioral and leadership · Coding · Machine learning · ML system design · Object-oriented design · Other questions · Practical engineering · System design
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Showing 151–175
Design a typeahead search system that displays real-time search suggestions as users type their queries. The system should focus on the retrieval and display of…
Companies: Microsoft, Databricks, Expedia, Google +3
System Design
Last reported Apr 2026
Implement an in-memory Role-Based Access Control (RBAC) system that supports assigning permissions to roles and roles to users. The system should handle queries to determine…
Companies: Microsoft
Last reported Apr 2026
Authentication & Authorization · System Design
Last reported Apr 2026
Design an online programming judge system for coding competitions where users can submit solutions to algorithmic problems, get real-time feedback on code execution, and…
Companies: Microsoft, Amazon, LinkedIn, Lyft +4
Last reported Apr 2026
Implement an LRU cache with a `put(byte[] photo)` method that persists a photo to memory and returns a generated unique ID (UUID), and a `get(String…
Companies: Microsoft
Last reported Apr 2026
Generate all distinct permutations of an array that may contain duplicate values. The core challenge is to exhaustively build permutations while avoiding duplicate results…
Companies: Microsoft
Last reported Apr 2026
Design and implement a production-ready LRU Cache service with authentication, rate limiting, and deployment considerations. The solution should handle concurrent HTTP requests…
Companies: Microsoft, Shopify
Last reported Apr 2026
Design and implement an end-to-end metric monitoring system that includes authentication, rate limiting, and deployment considerations.
Companies: Microsoft
Last reported Apr 2026
Design a system that allows users to search for any ongoing sports match (e.g., Brazil vs Argentina in the FIFA World Cup) on Bing and…
Companies: Microsoft
Last reported Apr 2026
Companies: Microsoft
System Design
Last reported Apr 2026
Companies: Microsoft
Real-Time Systems · System Design
Last reported Apr 2026
Given source and target strings and a set of weighted directed character transformations (possibly with multiple edges), find the minimum total cost to turn each…
Companies: Microsoft
Last reported Apr 2026
Rearrange the array in-place so all zeros are moved to the end while preserving the relative order of non-zero elements, without using extra storage. Aim…
Companies: Microsoft, Amazon, Google, Meta
Array · Two Pointers
Last reported Apr 2026
Companies: Microsoft, Capital One, Google, LinkedIn +4
Last reported Apr 2026
Companies: Microsoft
Last reported Apr 2026
Async processing with durable queues, per-channel isolation, retries/DLQ, at-least-once + idempotency, outbox, priorities.
Companies: Microsoft, Airbnb, Amazon, Autodesk +24
async-processing · idempotency · outbox-pattern · queues
Last reported Apr 2026
Companies: Microsoft
Real-Time Systems · System Design
Last reported Apr 2026
Companies: Microsoft
System Design · System Design Fundamentals
Last reported Apr 2026
Given a list of AI inference requests with arrival times and token counts, implement a batching strategy that groups requests to maximize throughput while respecting…
Companies: Microsoft
Last reported Apr 2026
Given an integer array and k, return the k most frequent elements — the core challenge is to count element frequencies and extract the top-k…
Companies: Microsoft, Amazon, Bloomberg, Google +9
Array · Bucket Sort · Counting · Divide and Conquer
Last reported Mar 2026
Design a session management service that ensures a single active session per user, handling session creation, validation, and termination across distributed systems.
Companies: Microsoft
Last reported Mar 2026
Design a user behaviour tracking system for an e-commerce platform that captures and analyzes user interactions such as product clicks, add-to-cart events, and purchases to…
Companies: Microsoft
Last reported Mar 2026
Design a fraud detection system that allows businesses to monitor transactions in real-time, identify suspicious activity, and automatically flag or block potentially…
Companies: Microsoft, Airbnb, Google, Plaid
ML System Design
Last reported Mar 2026
Design a multi-threaded logging framework that uses three dedicated threads: one to enqueue incoming log messages, one to write messages from the queue to a…
Companies: Microsoft, Salesforce
Last reported Mar 2026
Design a thread pool implementation that allows users to submit tasks for concurrent execution, manage a fixed number of worker threads, and efficiently queue and…
Companies: Microsoft
Last reported Mar 2026