SysDesignPrep.com

↑↓ to move ↵ to openAll 83 questions
← All companies

Anthropic system design interview questions

11 questions on this site are reported in Anthropic software engineer interviews. Each has a full reference design (requirements, back-of-envelope numbers, components, user flows and deep dives with interviewer follow-ups). Each one can be walked through turn by turn and then sat as a mock. Patterns covered: real-time, websockets, fan-out, chat, ranking, caching, social, gpu-batching, streaming, scheduling, kv-cache, tool-calling, context-management, rate-limiting, prompt-caching, consistent-hashing, eviction, replication, hot-keys, frontier, politeness, dedupe, distributed-queues, algorithms, counters, redis, edge, peer-to-peer, chunking, bandwidth, integrity, stragglers, rag, vector-search, hybrid-search, permissions, multi-tenancy, latency-budget, cancellation, prefix-caching, context-assembly, code-completion, ann-indexes, quantisation, segments.

Run an AI mock Anthropic interview →One of these questions, run as a live round in that style, with a debrief at the end.

Attribution comes from public interview guides and candidate reports, not from Anthropic. It indicates where a question has been asked, nothing more.

Anthropic questions

What the Anthropic round looks like

A 50–55 minute round, often on infrastructure behind an AI product rather than a consumer app. Two shapes are reported: design from scratch, and reviewing a design document and improving it.

What it is reported to weigh

  • Decomposition: breaking an open problem into parts that can be reasoned about separately
  • Scale reasoning under real constraints, especially scarce and expensive capacity
  • Failure modes, overload behaviour and what degrades first
  • Driving the conversation yourself at staff level, rather than waiting to be prompted

The common mistake

Most of the questions reduce to ordinary distributed systems: queueing, batching, backpressure. Candidates who reach for model internals instead of the infrastructure answer tend to drift.

From public interview guides and candidate reports, and Anthropic’s own interview guidance where it publishes any. Not endorsed by Anthropic. Formats change; treat it as a prior, not a promise.

How to prepare for the Anthropic system design interview

Large-company loops run 45 to 60 minutes, expect numbers, and spend most of the time on deep dives. Walk through a question to see how a strong candidate paces the hour, sit the same question as a mock until you can produce the requirements, the estimates and the design without looking, then read the interview framework guide for how to structure the hour. The other questions on the site teach patterns that show up in Anthropic interviews under different names.

Questions people ask about the Anthropic system design interview

What system design questions does Anthropic ask?

Questions reported in Anthropic system design interviews include Slack, News Feed, LLM Inference Service, ChatGPT, Distributed Cache, Web Crawler, Rate Limiter and Large File Distribution System, among 11 in total. Between them they test real time, websockets, fan out, chat, ranking and caching. The reports come from public interview guides and candidate accounts, not from Anthropic, so practise the patterns rather than memorising one list.

What is the Anthropic system design interview like?

A 50–55 minute round, often on infrastructure behind an AI product rather than a consumer app. Two shapes are reported: design from scratch, and reviewing a design document and improving it.

What does Anthropic look for in a system design interview?

Reports say the Anthropic round weighs 4 things. 1. Decomposition: breaking an open problem into parts that can be reasoned about separately. 2. Scale reasoning under real constraints, especially scarce and expensive capacity. 3. Failure modes, overload behaviour and what degrades first. 4. Driving the conversation yourself at staff level, rather than waiting to be prompted. Most of the questions reduce to ordinary distributed systems: queueing, batching, backpressure. Candidates who reach for model internals instead of the infrastructure answer tend to drift.

How do I prepare for the Anthropic system design interview?

Practise the questions reported there out loud, under a 45-minute clock: requirements with numbers first, then estimates, a high-level design, and deep dives into the two or three hardest parts. Start with Slack: watch a strong candidate answer it turn by turn, then sit it yourself. Then cover the patterns the round leans on (real time, websockets, fan out and chat) with one more question each.