System Design Interview Questions
Practice the exact questions companies are asking right now.
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Design a coffee ordering system
System Design: Coffee Ordering System Design a system for a coffee shop (or chain) that supports ordering drinks. Core use cases - Customer browses me...
How to stream a large file to 1000 hosts fastest
Problem You need to distribute a very large file stored in cloud object storage to 1000 servers in a data center. - The WAN link from cloud storage → ...
Design a sandboxed cloud IDE
System design: Sandboxed cloud IDE (Colab-like) Design a multi-tenant, browser-based cloud IDE/notebook that lets users run code in an isolated sandbo...
Design a payment system with holds and batching
Scenario Design a payment system that supports: 1. Hold payment (authorization): Place a temporary hold on a customer’s payment method for a given amo...
Design a single-node persistent in-memory cache
Scenario Design a single-machine cache used by a web service to handle read/write requests. The cache should: - Store key/value pairs in memory (fast ...
Design an ad frequency capping system
Design a real-time ad frequency capping system for an ads platform. When the ad server is deciding whether to show an ad, it must enforce caps such as...
Design a meeting scheduler and shopping cart
You are asked to do two system-design prompts. Prompt A: Meeting Scheduler Design a meeting scheduling system (similar to a calendar + scheduling assi...
Design cart management lifecycle service
Scenario You are designing the backend for an on-demand delivery app (restaurants and grocery). Users can create a cart, modify items from multiple de...
Design a cloud console main page
Scenario You are building the main landing page (home page) of a cloud service console that a user sees immediately after logging in (e.g., similar to...
Design an ads audience targeting system
Problem Design an ads audience targeting system that allows advertisers to upload large user lists and then target (or exclude) those users when servi...
Design streaming error-log counting with moving average
Design a core component in a streaming system: Input: - Multiple upstream services continuously emit log events. - Each event includes at least: servi...
Design a configurable monthly API rate limiter
Design a rate-limiting system for an expensive API. Requirements - Each user (or API key) has a monthly quota (e.g., 10,000 calls/month). - Users can ...
Design guardrails and fallback for LLM reliability
You operate a production application that uses an LLM to generate user-facing outputs (text actions, advice, summaries). The model is non-deterministi...
Design a distributed crossword fill solver
Scenario You are building a service that fills a crossword-like grid with words. - The board size is not specified; assume a medium board around 50×50...
Design a TikTok-like short video platform
Design a TikTok-like short-video product. Core user stories 1. Users upload short videos (e.g., 10–60 seconds). 2. Users watch an infinite For You fee...
Design a resilient bootstrap API
You are given three internal services (or internal APIs): 1) User Service: GET /user-to-consumer?user_id=... → returns { consumer_id, user_profile... ...
Design a location-based radius top-K search
Design a location-based search service. Input: - latitude, longitude - radius (meters) - K Output: - The top K locations within the radius. The term “...
Design a Scalable Job Scheduler
Design a job scheduler for a small startup, then explain how you would evolve it to support roughly 100x more scheduled tasks. The system should: - Al...
Design fulfillment truck routing and inventory system
Scenario You are designing software for a large e-commerce fulfillment center to plan truck routes and manage containers/inventory movement within and...
Design a Slack-like real-time messaging system
System Design: Slack-like Messaging (DMs + Channels) Design a Slack-like real-time messaging system that supports: Core features - Direct Messages (DM...