Software Engineer 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...
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...
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 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 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 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 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 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 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 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 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...
Design a distributed web crawler
Problem Design a web crawler that starts from one or more seed URLs and continuously discovers and fetches pages. Requirements - Inputs: One or more s...
Design centralized log ingestion and query system
Problem Design a system to collect, transmit, store, and query application/data logs from many services/hosts into a central data center database. Req...
Design homepage viewport rendering with deduplication
Design the backend + client interaction to support viewport rendering for a streaming service’s home page (rows of videos/tiles). Scenario - The home ...
Scale a rules engine for high traffic
Follow-up: scaling Assume the expense rules evaluator will be used in production and must support large-scale access. Design a high-level system that ...
Design a crossword puzzle solver system
Design a crossword puzzle solver Design a system that can solve a crossword puzzle. Inputs - A 2D board grid: - Some cells are blocked (black square...
Design a donation service for a 3‑day charity
System Design Prompt You are designing an online donation service for a 3-day charity campaign. Requirements - Donors can: - Select a charity campai...