Anthropic Coding Interview Questions
These are the 19 Anthropic coding interview questions AceOffer has reconstructed from candidate reports, sorted by how often each was reported. Web Crawler leads at 60×. Every question shows when it was last reported; the catalog refreshes monthly.
Key facts
- •19 distinct coding questions indexed
- •282 candidate reports across those questions
- •Most reported: Web Crawler — 60× (last seen July 2026)
- •Refreshed monthly · last updated August 2026
Which Anthropic rounds ask coding questions?
Anthropic draws coding questions from the rounds below. Counts are distinct questions, not times asked.
Most reported: Banking System (OA) — 17×
Most reported: File Deduplication — 52×
Most reported: Web Crawler — 60×
Which Anthropic coding questions get asked most?
Sorted by candidate-report frequency. Click any question for the full breakdown.
| Question | Round | Reported | Last seen |
|---|---|---|---|
| Web CrawlerFree Given a starting URL and a provided helper function (variously named getURLs, getLinksFrom, getPageLinks, or a jsoup wrapper) that takes a URL… | Phone Screen | 60× | July 2026 |
| File Deduplication Given a root directory (which may contain nested subdirectories), traverse the entire file tree and identify all groups of duplicate files —… | Coding | 52× | July 2026 |
| Profiling / Stack Trace Analysis You are given a list of samples from a sampling profiler. Each sample has a float timestamp and a list of function… | Coding | 40× | July 2026 |
| Image Processing Pipeline You are given a set of image files (small and large) and a set of JSON configuration files, each describing a pipeline… | Coding | 23× | August 2026 |
| Banking System (OA) Design and implement an in-memory banking system in Python on CodeSignal. The problem is split into 4 progressive levels (90 minutes total);… | OA | 17× | July 2026 |
| In-Memory Database Implement a toy in-memory database (using only the standard library, no frameworks) with progressively harder levels, each building on the previous: Level… | OA | 16× | July 2026 |
| Tokenizer Implementation You are given a vocabulary dictionary mapping strings (tokens) to integer IDs, e.g. {'a': 1, 'b': 2, 'cd': 3, 'UNK': -1}, and… | Phone Screen | 14× | July 2026 |
| Distributed Mode/Median You are given a cluster of 10 distributed worker nodes, each holding a shard of a large integer dataset. The total dataset… | Coding | 12× | July 2026 |
| LRU Cache You are given a Python LRU cache implementation (skeleton or partially complete code) that acts like a memoization decorator, similar to Python's… | Coding | 12× | July 2026 |
| File Systems OA (Multi-Part) A multi-part coding assessment centered on file system topics. Based on reports, the OA contains at least 3 progressive sub-problems related to… | OA | 8× | May 2026 |
| Recipe Manager 90-minute CodeSignal OA. Implement a RecipeManager system across 4 progressive levels — you must pass each level to unlock the next. Only… | OA | 6× | April 2026 |
| Task Management System A multi-part (4-level) object-oriented coding problem simulating a Task Management System. Candidates implement progressively more complex functionality: - Level 1: Basic CRUD… | OA | 4× | May 2026 |
| VLIW / TPU / Kernel Optimization Assignment Take-home coding assignment (2–4 hours, AI usage permitted) for Anthropic's acceleration/performance engineering roles. You are given a Python-based VLIW or TPU simulator… | OA | 4× | December 2025 |
| Consecutive Event / Sample Detection You are given a stream of Sample objects, each containing a numeric timestamp and an ordered list of elements (strings), e.g. Sample(1.0,… | Phone Screen | 3× | December 2025 |
| Claude Agent Loop with Multi-Step Tool Calling Anthropic's "Agents / Coding with LLMs" round. The recruiter brief: "This interview will test writing code with LLMs as a building block,… | Phone Screen | 3× | August 2026 |
| Bootloader with Loop Detection Given a file with instructions (plus, next, jump) where plus increments accumulator, next skips one line, and jump moves by offset. One… | Coding | 3× | July 2026 |
| Cloud File Storage System Anthropic OA: Design and implement a toy simulation of a cloud file storage system app using only standard library features. The problem… | OA | 3× | July 2025 |
| Debugging Exercise (OA Part ii) | OA | 1× | June 2026 |
| Step-by-step Implementation (OA Part i) Implement functionality in 0-7 incremental steps with increasing difficulty. Topics include recursion, caching, and concurrency. Requires camera… | OA | 1× | June 2026 |
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