Anthropic Software Engineer System Design Interview Questions
Practice the exact questions companies are asking right now.
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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 one-to-one chat system
Design a one-to-one chat system for a web application. Assumptions: - Each user is active on at most one browser device at a time. - Group chat is out...
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 Crash-Resilient LRU Cache
You have an in-memory LRU cache with fixed capacity and standard get(key) / put(key, value) operations. Normally, an LRU cache is volatile, but now yo...
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 a desktop AI chat frontend
Design a Frontend Architecture for a Cross-Platform Desktop Conversational AI App Context You are designing the frontend architecture for a cross-plat...
Design distributed median and mode
Distributed System Design: Global Median and Global Mode at Massive Scale Context You are designing a distributed analytics system that must compute t...
How would you scale batch image pipelines?
Design a system to process m input images with n pipelines, producing m×n outputs. - Pipelines are sequences of image operations (resize/rotate/filter...
Design a concurrent web crawler
System Design: Concurrent Web Crawler (Threads) You are asked to design and implement a basic web crawler that fetches pages concurrently using a thre...
Design a Concurrent Domain Crawler
Design a crawler that starts from one seed URL and explores all reachable pages in the same domain efficiently. Discuss: - How you would structure the...
Design a prompt-sharing platform
The interviewer gives you a fixed high-level architecture: client -> web server -> database. Do not spend time redrawing the whole system. Design the ...
Optimize HTTP requests for speed and limits
You are building a service that needs to send HTTP requests to a large number of URLs (for example, a simple web crawler or data fetcher). The naive i...
Describe a Python design-and-coding approach in Colab
Python Coding-and-Design Exercise in Google Colab Task You are assigned a generic coding-and-design exercise to be completed in Python using Google Co...
Implement a thread-safe producer–consumer buffer
Bounded Blocking Buffer with Shutdown and Timeouts You are asked to design and implement a thread-safe, fixed-capacity producer–consumer buffer that s...
Design a scalable network I/O service
System Design: High-Volume Network I/O Backend (Files and Streaming) Context Design a backend service that supports millions of users uploading and do...
Design production-ready dedup service
System Design: Production-Ready File Deduplication Service Context Design a multi-tenant cloud service that stores files and achieves space savings vi...
Identify and mitigate deduplication program risks
System Design: Robust File Deduplication in the Real World Context You are designing a file deduplication tool that scans large directory trees on one...
Optimize a compute kernel with a simulator
Performance Optimization Plan for a Compute Kernel Context You are given: - A compute kernel (single critical function or set of loops) to optimize. -...
Design a scalable, reliable system
System Design: Global Photo/Video File Storage and Sharing ("CloudDrive") Context Design a scalable, highly reliable consumer service where users uplo...
Design a scalable web crawler
System Design: Scalable Web Crawler Context Design a production-ready web crawler that discovers and downloads publicly accessible web pages at intern...