Anthropic

AI safety and research company behind Claude, focusing on constitutional AI.

5 Rounds ~20 Days Very Hard

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The Interview Loop

Recruiter Screen (30 min)

Standard fit check, behavioral questions, and resume overview.

Technical Loop (3-4 Rounds)

Deep dive into domain knowledge, coding, and system design.

Interview Question Bank

All Roles Backend Engineer 3 Software Engineer 3

All Topics System Design 122 Algorithms 85 Culture Fit 63 SQL 27 Machine Learning 25 Leadership 25 Data Engineering 14 Security 12

Backend Engineer • Coding • medium

Implement a thread-safe LRU Cache with a Time-To-Live (TTL) for each item. Expired items should not be returned and should be cleaned up efficiently.

#Hash Map #Linked List #Concurrency

Backend Engineer • Coding • medium

Implement a Trie (Prefix Tree) that supports inserting strings, searching for exact matches, and finding all strings that share a given prefix. Optimize it for memory.

#Trees #String Manipulation #Memory Optimization

Backend Engineer • Coding • medium

Implement a bounded blocking queue. It should support enqueue and dequeue operations, blocking when full or empty, respectively.

#Concurrency #Synchronization #Thread Safety

Software Engineer • Coding • medium

Implement an LRU (Least Recently Used) cache. Once completed, discuss how you would modify it to support an LFU (Least Frequently Used) eviction policy for LLM prompt caching.

#Caching #Hash Map #Linked List

Software Engineer • Coding • medium

Implement an LRU Cache with a Time-To-Live (TTL) feature. If an item is accessed after its TTL has expired, it should be treated as a cache miss and removed.

#Linked Lists #Hash Maps #Caching

Software Engineer • Coding • medium

Implement a Trie (Prefix Tree) to support fast autocomplete suggestions. Include a method to insert words with a frequency score, and a method to retrieve the top 3 most frequent completions for a given prefix.

#Trees #Trie #Design #Sorting

Difficulty Radar

Based on recent AI-sourced data.

Meet Your Interviewers

The "Standard" Interviewer

Senior Engineer

Focuses on core competencies, system constraints, and clear communication.

Unwritten Rules

Think Out Loud

Always explain your thought process before writing code or drawing architecture.