Anthropic Software Engineer Onsite Coding Questions

Zhongchang 2YOE Investment Phone: tokenizer, I forgot a few follow ups, there was a previous interview that explained it more comprehensively prompt: For the coding interview, we will be doing coding

This post was last edited by Anonymous on 2025-09-30 13:40. I recently had an interview and am now giving back to the forum. The on-site interview involved duplicate files. Most of the questions on th

LeetCode #636: Exclusive Time of Functions. Difficulty: Medium. Topics: Array, Stack. Asked at Anthropic in the last 6 months.

## Problem: In-Memory Database with Backup and Restore Build a toy core-logic, purely in-memory key-value database (no UI/framework), using only the standard library. You must process input commands

**Part A: SQL (basic)** Given a table `events` with: - `user_id` (string) - `event_time` (timestamp) - `event_type` (string) - `value` (numeric) Write SQL for (implement 1–2 as requested): 1. Daily

You are given a dataset (file or table). Using **Python**, perform an analysis and produce reproducible outputs (code + conclusions). The dataset relates to **cloud capacity management / optimization*

## Problem: Implement a UI From a Figma Mock Using React + TypeScript (Live Coding) You are given a **Figma mock** (a link or screenshots provided by the interviewer). Implement the UI using **React

## Problem: Implement and Debug an LRU Cache Implement a fixed-capacity **LRU (Least Recently Used) cache** supporting the following operations in **amortized O(1)** time: - `get(key)`: If `key` exi

## Problem: Implement a Weighted Data Batcher with Deterministic Save/Resume You are given an implemented `DataRegistry` (provided in the interview Colab) that can return an **iterator** for a datase

## Problem: Build an Image Processing Pipeline (Grayscale / Scale / Resize) and Optimize Performance You are given a set of input images and a list of image-processing `operations`. Implement a progr

## Problem: Detect Duplicate Files (group by size, then by content hash) You are given file metadata and a content-reading interface. Implement a tool to find duplicate files: - Two files are duplic

## Problem: Build a Web Crawler (single-thread first, then multi-thread) Given a starting URL `start_url`, implement a crawler that visits qualifying linked pages and returns the set (or list) of vis

## Problem: Implement a Web Crawler (single-threaded first, then concurrent) Given a starting URL `startUrl`, implement a crawler that fetches links from web pages. You are given an API `getUrls(url

## Problem: Debug an LRU Cache Implementation + Persistence After Crash (Follow-ups) You are given a Python implementation of an LRU cache (HashMap + doubly-linked list) intended to support: - `get(k

## Problem: Implement a Same-Domain Web Crawler (Sync + Async Follow-up) Given a starting URL `start_url`, implement a web crawler that recursively fetches pages and returns all page URLs that belong

## Question 2: Code & Design — Design and implement a Data Batcher Design a **data batcher** to organize samples into training batches and iterate efficiently within a training loop. ### Requirement

(Insufficient information: VO Q2 was only mentioned as possibly file dedup or LRU cache; cannot be reconstructed into an answerable prompt, ignored.)

## Problem: Multithreaded Web Crawler (Thread-Safe) Implement a thread-safe web crawler that starts from a list of seed URLs, fetches pages concurrently, discovers new links, and continues until ther

Implement a web crawler that collects all URLs reachable from `startUrl` that belong to the **same hostname** as `startUrl`. You are given: ```python class HtmlParser: def getUrls(self, url: str

You are given a string `text` and a vocabulary map `vocab`: - `vocab` maps token strings to integer ids. - `vocab` always contains a special token `"UNK"` whose id is some integer (e.g. `-1`). Imple