Anthropic Software Engineer Coding & Algorithms Interview Questions
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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...
Implement a Parallel Image Processor
You are building a batch image-processing utility. Implement a function that receives a list of jobs. Each job contains: - input_path: the source imag...
Build a concurrent web crawler
Implement a web crawler that starts from a given URL and visits every reachable page on the same host. You are given: - start_url: a string representi...
Implement a Batch Image Processor
Implement a program that applies basic image transformations to a batch of images. You are given a list of input image paths and, for each image, a se...
Generate outputs for images and pipelines
You are given m input images and n processing pipelines. - Each pipeline is an ordered list of k operations (e.g., resize, rotate, crop, blur, color t...
Implement crawler and file deduplication
The interview included two coding exercises: 1. Build a web crawler starting from a seed URL within a single domain. First implement a single-threaded...
Detect duplicate files efficiently
You are given access to a very large file system containing file paths and read access to file contents. Design an algorithm to identify groups of fil...
Convert stack samples to trace events
Question Implement convertToTrace(samples) that, given a chronologically ordered vector of stack samples (each sample contains a timestamp and a call-...
Implement staircase printing and distributed mode/median
Problem A: Print a “staircase” pattern Implement a function that prints a staircase with n rows. Input - An integer n (n >= 1) Output - Print n lines....
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...
Implement file deduplication at scale
Write a program to deduplicate files in a very large directory tree. Identify groups of identical files without loading entire files into memory. Outl...
Design a single- and multi-threaded web crawler
Web Crawler (single-threaded, then multi-threaded) You are given: - A starting URL startUrl (e.g., "http://news.example.com/a/index.html"). - An inter...
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...
Crawl Same-Domain Links
Implement a Python function that crawls a website starting from a seed URL and returns all unique pages reachable within the same domain. Assume a hel...
Parse and Reconstruct Stack Trace
Given a multi-line stack trace string from a single thread (e.g., each frame is in the form 'at Module::Function(file:line)'), design and implement a ...
Design an IPv4 Address Iterator
Design a class that iterates through IPv4 addresses. An IPv4 address is a string in the form a.b.c.d, where each octet is an integer from 0 to 255. Im...
Simulate stack traces from logs
Given a list of log entries describing function calls, each formatted as "<id> <event> <timestamp>" where event ∈ {START, END} and timestamps are inte...
Implement crawler, dedup, and persistent LRU
Question LeetCode 1236. Web Crawler: Crawl web pages starting from a given URL within the same hostname. LeetCode 609. Find Duplicate File in System: ...
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 high-throughput hashing for kernels
Design a high-throughput hash-based lookup to be called inside a tight kernel. Choose between open addressing and chaining, specify the load factor, p...