Anthropic Software Engineer Interview Questions

Anthropic Software Engineer interview questions tend to reflect the company’s dual focus on building reliable, high-quality software and on safe, responsible AI. Expect a blend of practical algorithmic coding, systems design, and mission-aligned behavioral or safety reasoning. Interviewers often probe clarity of thought and written communication as much as raw coding speed, and you should be ready to explain trade-offs, failure modes, and how you would make a system robust in real-world conditions. For interview preparation, plan for a multi-step process: an initial recruiter screen, a timed coding exercise or take-home, a hiring-manager conversation, and a longer onsite loop that mixes coding, design, and culture-fit questions. Prepare by practicing medium-to-hard coding problems with an emphasis on clean, modular solutions, refreshing distributed-systems and API design fundamentals, and producing concise one-page design notes or safety-minded postmortems you can discuss. Balance technical polish with concrete stories of impact and collaboration; reviewers are looking for engineers who can ship reliable systems, reason about edge cases, and communicate trade-offs clearly.

160 Questions 1 Company07.30.2026
Showing 20 results
Role
Anthropic logo
Anthropic
Hard
Software Engineer

Optimize a compute kernel with a simulator

Performance Optimization Plan for a Compute Kernel Context You are given: - A compute kernel (single critical function or set of loops) to optimize. -...

System Design
17
0
231 people solved
Sep 6, 2025
Anthropic logo
Anthropic
Hard
Software Engineer

Guide and override compiler optimizations

Guiding a Compiler for a VLIW-like Backend You are optimizing hot loops for a VLIW-like target (e.g., DSP/AI accelerator) where the compiler sometimes...

System Design
10
0
171 people solved
Sep 6, 2025
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Anthropic
Hard
Software Engineer

Design a profiling plan for kernels

Rigorous Profiling and Experimentation Plan for a Kernel Simulator You are given only a kernel simulator that reports cycle counts and microarchitectu...

Analytics & Experimentation
21
0
166 people solved
Sep 6, 2025
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Anthropic
Hard
Software Engineer

Group Duplicate Files by Content

Group Duplicate Files by Content Given a snapshot of files, return groups of paths whose complete contents are identical. The interview report preserv...

Coding & Algorithms
0
0
6 people solved
Apr 16, 2026
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Anthropic
Medium
Software Engineer Locked

Implement a Batch Image Processor

This question evaluates a candidate's competency in image processing operations and parallel/concurrent programming, covering basic transformations (g...

Coding & Algorithms
11
0
82 people solved
Apr 1, 2026
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Anthropic
Medium
Software Engineer Locked

Implement a longest-match tokenizer

This question evaluates string-processing and algorithmic implementation skills for greedy longest-match tokenization, including handling runs of unma...

Coding & Algorithms
4
1
73 people solved
Oct 19, 2025
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Anthropic
Hard
Software Engineer

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...

Coding & Algorithms
115
0
772 people solved
Oct 15, 2025
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Anthropic
Hard
Software Engineer Locked

Optimize a core kernel for throughput

This question evaluates low-level performance optimization competencies, including loop transformations, memory-access patterns, vectorization, parall...

Software Engineering Fundamentals
16
0
206 people solved
Nov 19, 2025
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Anthropic
Medium
Software Engineer

Detect duplicate files by content

Detect duplicate files by content in a filesystem. Given access to a directory tree, return groups of file paths that have identical byte content. Min...

Coding & Algorithms
12
0
188 people solved
Aug 1, 2025
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Anthropic
Hard
Software Engineer Locked

Build a least-recently-used cache

This question evaluates a candidate's competence in designing and implementing efficient in-memory cache mechanisms, focusing on data structures, evic...

Coding & Algorithms
4
0
35 people solved
Feb 8, 2026
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Anthropic
Hard
Software Engineer

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...

Coding & Algorithms
16
0
114 people solved
Jan 6, 2026
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Anthropic
Medium
Software Engineer

Design file deduplication across nested directories

Design and implement a file deduplication tool that, given a root directory, identifies groups of duplicate files. Requirements: traverse nested direc...

Coding & Algorithms
21
0
204 people solved
Aug 14, 2025
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Anthropic
Hard
Software Engineer

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....

Coding & Algorithms
67
0
923 people solved
Nov 19, 2025
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Anthropic
Medium
Software Engineer

Design file deduplication algorithm

Design an algorithm to deduplicate files in a storage system. Compare fixed-size versus content-defined chunking and explain how you would choose hash...

Coding & Algorithms
12
0
201 people solved
Sep 6, 2025
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Anthropic
Medium
Software Engineer

Apply bitwise tricks for performance

For an integer-heavy inner loop, propose bit-level optimizations that reduce branches and memory traffic: e.g., population count usage, fast modulo by...

Coding & Algorithms
22
0
162 people solved
Sep 6, 2025
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Anthropic
Medium
Software Engineer

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...

Coding & Algorithms
99
0
759 people solved
Sep 6, 2025
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Anthropic
Medium
Software Engineer

Design and implement a Python solution

Design and implement a solution in Python for a problem specified by the interviewer. Outline your approach and chosen data structures, justify key de...

Coding & Algorithms
26
0
243 people solved
Sep 6, 2025
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Anthropic
Medium
Software Engineer

Implement Python LRU cache with args and persistence

Implement an LRU cache in Python as a decorator or class that correctly supports variable-length positional arguments and keyword arguments. Ensure th...

Coding & Algorithms
46
0
314 people solved
Aug 1, 2025
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Anthropic
Medium
Software Engineer

Implement a same-host web crawler

Implement a web crawler. Given a start URL and a function get_links(url) -> list of URLs, return all URLs that share the same hostname as the start. A...

Coding & Algorithms
14
0
102 people solved
Aug 1, 2025
Anthropic logo
Anthropic
Medium
Software Engineer

Implement thread-safe blocking queue

Question Design and implement a thread-safe bounded blocking queue that supports concurrent enqueue and dequeue operations using standard synchronizat...

Coding & Algorithms
8
0
13 people solved
Jul 29, 2025
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Frequently Asked Questions

How difficult are Anthropic Software Engineer interview questions?
Anthropic Software Engineer interview questions are generally rated as challenging and selective. Interviewers often probe both algorithmic fluency and systems thinking with time-constrained coding problems as well as deeper architecture or project-focused discussions, so strong fundamentals, clean code, and clear explanations are required to progress. Candidates report that interviews push on edge cases, performance trade-offs, and safety-minded reasoning for production systems, which raises the bar above a pure leetcode-style loop. Expect competition to be stiff and to demonstrate not just correct solutions but thoughtful trade-offs and communication under pressure.
What is the typical interview process for a Software Engineer at Anthropic and where do Software Engineer topics appear in it?
The typical process begins with a recruiter screen and usually includes a timed online assessment followed by a hiring-manager conversation and a technical interview loop of several rounds that combine live coding, system design, and project or behavioral discussions. Software-engineering topics appear throughout: algorithm and data-structure problems in coding rounds, distributed-systems and API design in architecture interviews, and product or project questions that probe real-world engineering judgment. Later stages often include reference checks and team matching, and interviews are commonly conducted remotely over video.
How long should I prepare for Anthropic interviews and how should I structure that timeline?
Preparation time varies by background but many candidates find a focused 4–12 week plan effective: start with two to four weeks on core algorithms and data structures with timed practice to build speed and reliability, spend another two to four weeks on system design and distributed systems scenarios including trade-offs and reliability, and reserve the final weeks for mock interviews, reviewing your past projects, and rehearsing clear behavioral stories tied to impact and safety considerations. If you need to refresh domain-specific knowledge such as GPU inference or infra, add that early to allow depth rather than cramming.
Which key subtopics are most important to master for Anthropic Software Engineer interviews?
Core algorithmic competence—arrays, trees, graphs, hashing, and complexity reasoning—is essential, as is the ability to write correct, testable code under time pressure. Equally important are system design skills: APIs, data modeling, scaling, caching, and reliability trade-offs for high-throughput services. Because Anthropic focuses on AI products, interviewers often evaluate engineering choices related to model inference, memory/GPU constraints, and safety-aware design decisions. Clear communication, debugging instincts, and the habit of enumerating edge cases and performance implications often separate successful candidates from others.
What are standout preparation tips and common pitfalls to avoid for Anthropic interviews?
Standout preparation includes practicing live coding with verbalized problem solving, doing end-to-end system designs that emphasize reliability and safety, and preparing concise stories that demonstrate ownership and impact. During interviews, clarify requirements, state assumptions, and justify trade-offs rather than jumping to an implementation. Common pitfalls are under-explaining design choices, neglecting edge cases or performance constraints, and treating interviews as purely academic exercises instead of engineering problems with practical constraints. Also be transparent about using AI tools in application materials and follow the company’s current guidance on AI-assisted content.

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