Anthropic
AI safety and research company behind Claude, focusing on constitutional AI.
5 Rounds
~20 Days
Very Hard
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
Backend Engineer
•
Coding
•
medium
Implement a thread-safe Rate Limiter using the Token Bucket algorithm. It should support multiple users and handle concurrent requests efficiently.
#Concurrency
#Data Structures
#API Design
Backend Engineer
•
Coding
•
hard
Write an asynchronous task scheduler in Python (using asyncio) or Rust (using tokio) that executes a DAG (Directed Acyclic Graph) of tasks with maximum concurrency.
#Graph Theory
#Asynchronous Programming
#Concurrency
Backend Engineer
•
Coding
•
hard
Implement a streaming JSON parser that can take chunks of a JSON string (as they are generated by an LLM) and yield valid parsed objects as soon as they are complete.
#Parsing
#State Machines
#String Manipulation
Backend Engineer
•
Coding
•
hard
Given a stream of tokens (strings), implement a data structure to efficiently find the top K most frequent tokens in a sliding window of the last N minutes.
#Streaming Data
#Heaps
#Sliding Window
Backend Engineer
•
Coding
•
hard
Write a function to merge K sorted asynchronous streams of data into a single sorted stream. You cannot load all data into memory at once.
#Heaps
#Asynchronous Programming
#Streaming
Backend Engineer
•
Coding
•
hard
Given a string representing a user prompt, find the longest repeating substring. This is useful for detecting repetitive loops in context windows.
#String Manipulation
#Dynamic Programming
#Suffix Trees
Backend Engineer
•
Coding
•
hard
Write a program to justify text. Given an array of words and a max width, format the text such that each line has exactly max width characters and is fully (left and right) justified.
#String Manipulation
#Array
#Simulation
Backend Engineer
•
Coding
•
medium
Given a massive log file of API requests, write a script to find the 99th percentile latency. The file is too large to fit into memory.
#Data Processing
#Approximation Algorithms
#File I/O
Backend Engineer
•
Coding
•
medium
Implement a deep copy function for a complex graph data structure that may contain cycles. Ensure that nodes are duplicated correctly without infinite loops.
#Graph Theory
#Recursion
#Hash Map
Difficulty Radar
Based on recent AI-sourced data.
Meet Your Interviewers
The "Standard" Interviewer
Senior EngineerFocuses on core competencies, system constraints, and clear communication.
SimulateUnwritten Rules
Think Out Loud
Always explain your thought process before writing code or drawing architecture.