Anthropic Software Engineer Interview Questions
Anthropic Software Engineer interview questions tend to reflect the company’s dual focus on building reliable, high-quality software and on safe, responsible AI. Expect a blend of practical algorithmic coding, systems design, and mission-aligned behavioral or safety reasoning. Interviewers often probe clarity of thought and written communication as much as raw coding speed, and you should be ready to explain trade-offs, failure modes, and how you would make a system robust in real-world conditions. For interview preparation, plan for a multi-step process: an initial recruiter screen, a timed coding exercise or take-home, a hiring-manager conversation, and a longer onsite loop that mixes coding, design, and culture-fit questions. Prepare by practicing medium-to-hard coding problems with an emphasis on clean, modular solutions, refreshing distributed-systems and API design fundamentals, and producing concise one-page design notes or safety-minded postmortems you can discuss. Balance technical polish with concrete stories of impact and collaboration; reviewers are looking for engineers who can ship reliable systems, reason about edge cases, and communicate trade-offs clearly.
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Implement a crash-resilient LRU cache
Implement an LRU-based memoization helper with behavior similar to a standard Python LRU cache. You are given an interface like this: `python class LR...
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 GPU inference request batching
Design a system that serves online model-inference requests on GPUs. Requests arrive one at a time from clients, but GPU throughput is much better whe...
Implement an in-memory DB with TTL backup/restore
Problem Design an in-memory database that stores values in a nested structure: - key (string) → field (string) → value (string) - Each (key, field) en...
Design stack with O(1) minimum query
Design a stack-like data structure that supports the following operations, each in O(1) time: - push(x): push integer x onto the stack - pop(): remove...
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...
How do you handle an LLM agents interview?
You have an interview on your agenda titled “Agents Interview.” Explain how you would approach this interview if it is about designing and evaluating ...
Generate outputs for images and pipelines
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Implement staircase printing and distributed mode/median
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Design a distributed web crawler
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Design a high-concurrency LLM inference service
You are designing an LLM inference platform that serves interactive user requests (chat/completions) on GPUs. Goals - Support high concurrency with pr...
How do you review a design document?
You have an interview on your agenda titled “Design Doc Review.” You are given a written design document for a new feature/service (or a major change ...
How do you lead under risk and uncertainty?
Answer the following engineering leadership questions (EM/Senior level). Use specific examples. 1. Tell me about a time you rejected a technically exc...
Find duplicate files and apply image operations
Part A — Find duplicate files by content You are given a list of directory records. Each record is a string describing a directory path followed by on...
Describe your most impactful project
Tell me about the project where you had the most impact. Explain the business or user problem, why it mattered, what your specific role was, the harde...
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...
How do you design an A/B experiment?
You have an interview on your agenda titled “Experiment Design.” You are asked to design an online experiment (A/B test) for a product change. Describ...
Improve concurrency beyond a single lock
You are given a simple multi-threaded component that protects all shared state with a single mutual-exclusion lock (mutex). Scenario A service has man...
Debug a GRPO training loop and explain ratios
You are given a simplified implementation of a GRPO (Group Relative Policy Optimization) training step for an RLHF-style policy model. The training is...
Design an in-memory banking service
Design an in-memory banking service supporting timestamped operations and edge-case semantics. Implement: ( 1) create_account(id, t): Create a new acc...