Anthropic interview practice

Anthropic interview questions and coding practice. Start with verified evidence.

Practice from 26 Anthropic-tagged public coding problems, organized only by the stage, topic, difficulty, and recency metadata FastPrep can verify. The broader public catalog also includes 11 system-design exercises, 4 project-coding exercises.

Catalog: 41 public practice assets (26 coding)
Start here: Use the stage named in your invitation
Evidence: OA · Phone · Onsite metadata, shown in context

Anthropic practice workspace

Stage-led · public FastPrep catalog

OA practice path

Online Assessment

Build a timed implementation rhythm from prompt to edge cases. Problems are ranked by repeated public catalog sightings.

Solve one end to end

18 Anthropic-tagged Online Assessment problems available.

Company	Problem	Difficulty	Public evidence	Action
ANAnthropic	In-Memory Database with Backup and RestoreDesignHash Table	Hard	13 public reportsLast reported May 2026	Practice
ANAnthropic	Banking System, Part 1: Accounts and TransfersDesignHash Table	Easy	11 public reportsLast reported Oct 2026	Practice
ANAnthropic	Banking System, Part 2: Top SpendersDesignHash Table	Medium	10 public reportsLast reported Jul 2026	Practice
ANAnthropic	Banking System, Part 3: Scheduled PaymentsDesignHash Table	Hard	10 public reportsLast reported Jul 2026	Practice
ANAnthropic	Banking System, Part 4: Merging and Balance HistoryDesignHash Table	Hard	10 public reportsLast reported Jul 2026	Practice
ANAnthropic	Cloud Storage SystemDesignHash Table	Medium	9 public reportsLast reported Aug 2026	Practice
ANAnthropic	In-Memory Database Historical LookupHash TableDatabase	Hard	6 public reportsLast reported Nov 2025	Practice
ANAnthropic	Worker Management, Part 1: Office RegistrationHash TableDesign	Easy	4 public reportsLast reported May 2026	Practice
ANAnthropic	Worker Management, Part 2: Top WorkersHash TableSorting	Medium	4 public reportsLast reported May 2026	Practice
ANAnthropic	Worker Management, Part 3: Promotions and SalaryHash TableIntervals	Hard	4 public reportsLast reported May 2026	Practice
ANAnthropic	Worker Management, Part 4: Double-Paid IntervalsHash TableIntervals	Hard	4 public reportsLast reported May 2026	Practice
ANAnthropic	Repair the Bootloader ProgramArraySimulation	Medium	3 public reportsLast reported Sep 2026	Practice
ANAnthropic	Cloud Storage Compression and DecompressionHash TableSorting	Hard	3 public reportsLast reported Feb 2026	Practice
ANAnthropic	Banking Pending Transfer AcceptanceHash TableDesign	Medium	2 public reportsLast reported Jul 2024	Practice
ANAnthropic	Task Management SystemDesignHash Table	Hard	1 public reportLast reported Aug 2026	Practice
ANAnthropic	Normalize a DNS Domain NameString	Easy	1 public reportLast reported May 2026	Practice
ANAnthropic	Cloud Storage File VersioningHash TableSorting	Medium	1 public reportLast reported Apr 2024	Practice
ANAnthropic	Cloud Storage Prefix Trash and RestoreHash TableString	Hard	1 public reportLast reported Apr 2024	Practice

Phone practice path

Phone Screen

Practice solving while explaining assumptions, tradeoffs, and complexity. Problems are ranked by repeated public catalog sightings.

Solve one end to end

Company	Problem	Difficulty	Public evidence	Action
ANAnthropic	Convert Stack Samples to Trace EventsStackSimulation	Medium	12 public reportsLast reported Sep 2026	Practice
ANAnthropic	Confirmed Profiling Events with First-Observed StartsArrayStack	Hard	3 public reportsLast reported Sep 2026	Practice
ANAnthropic	Profiling Events from Consecutive Stack SamplesArrayStack	Hard	3 public reportsLast reported Sep 2026	Practice
ANAnthropic	Find Duplicate File GroupsArrayString	Medium	1 public reportLast reported Sep 2026	Practice
ANAnthropic	Crawl Same-Hostname URLs ConcurrentlyGraphBreadth-First Search	Medium	1 public reportLast reported Sep 2026	Practice

Onsite practice path

Onsite

Practice complete solutions and defend the choices behind them. Problems are ranked by repeated public catalog sightings.

Solve one end to end

Company	Problem	Difficulty	Public evidence	Action
ANAnthropic	Convert Stack Samples to Trace EventsStackSimulation	Medium	12 public reportsLast reported Sep 2026	Practice
ANAnthropic	Confirmed Profiling Events with First-Observed StartsArrayStack	Hard	3 public reportsLast reported Sep 2026	Practice
ANAnthropic	Profiling Events from Consecutive Stack SamplesArrayStack	Hard	3 public reportsLast reported Sep 2026	Practice
ANAnthropic	Repair the Bootloader ProgramArraySimulation	Medium	3 public reportsLast reported Sep 2026	Practice
ANAnthropic	Recover a Function-Call LRU Cache with a Write-Ahead LogDesignHash Table	Hard	1 public reportLast reported Oct 2026	Practice
ANAnthropic	Trace Events from Stable Whole-Stack StatesArrayString	Medium	1 public reportLast reported Oct 2026	Practice
ANAnthropic	Cache Shared Image Pipeline PrefixesArrayMatrix	Hard	1 public reportLast reported Aug 2026	Practice

01 · Stage workflow

Practice the stage you actually have next.

Combine algorithm work with public system-design and project-coding practice so preparation covers both narrow implementation and larger engineering decisions. Your invitation and recruiter guidance remain the source of truth.

01
Online Assessment
Use the timing and format in your invitation as the source of truth. In practice, work without interruptions, budget time to read constraints, and reserve a final review window for boundary cases.
- State the input, output, and complexity target before coding.
- Implement one complete solution inside a fixed timebox.
- Run small, duplicate, empty, and boundary cases before finishing.
02
Phone Screen
Treat the problem as a conversation. Clarify the contract, describe the approach before implementation, and keep narrating meaningful decisions while you code and test.
- Ask clarifying questions instead of silently filling gaps.
- Explain the data structure and expected complexity.
- Walk through at least one example and one edge case aloud.
03
Onsite
Use the catalog's onsite labels as practice context, not as a promise about a specific loop. Focus on collaborative problem solving: compare approaches, implement cleanly, and explain how the solution behaves at scale.
- Compare a straightforward approach with the optimized one.
- Keep the implementation readable while discussing tradeoffs.
- Test the result, then name follow-up improvements explicitly.

02 · Broader technical practice

Practice beyond standalone coding questions.

These public Anthropic-tagged exercises cover additional technical formats. They are included only when a verified catalog record and a crawlable practice page both exist.

System designLast reported Oct 2026

Design a Gang-Scheduled GPU Inference Pool

Design an inference request path with explicit latency accounting and one-GPU or all-GPU batches that each complete in 100 milliseconds.

Open practice

System designLast reported Oct 2026

Design a Prompt Playground

Design a collaborative prompt experimentation product with immutable versions, reproducible runs, searchable results, and safe model-provider execution.

Open practice

Project codingLast reported Oct 2026

Implement Concurrent Image Transformations

Implement image resizing, choose a concurrency model, and process independent transformations concurrently.

Open practice

System designLast reported Oct 2026

One-to-One Chat Service

Design a durable web messaging service for private two-person conversations, including conversation discovery, ordered storage, replayable delivery, replica-aware reads, burst handling, and offline recovery.

Open practice

System designLast reported Oct 2026

Design Opaque-GPU Inference Capacity

Size and route online and offline inference across opaque GPU workers using measured capacity, batching, and explicit overload policy.

Open practice

System designLast reported Oct 2026

Design a Large-Model Inference Serving Platform

Serve versioned large models on shared accelerators with shard-aware scheduling, continuous batching, bounded admission, streaming recovery, stable experiments, and safe fallback or rollback.

Open practice

System designLast reported Sep 2026

Design a Communication-Efficient Distributed Median Aggregation

Compute an exact median across ten partitioned workers while balancing transmitted bytes against coordinated rounds.

Open practice

System designLast reported Sep 2026

Design a Communication-Efficient Distributed Mode Aggregation

Compute one exact deterministic mode across ten partitioned workers while minimizing transmitted value/count data.

Open practice

System designLast reported Sep 2026

Design Telemetry Name Reconciliation

Design a deterministic control plane and data path that converge legacy telemetry-name variants onto canonical metrics without fuzzy matching.

Open practice

System designLast reported Aug 2026

Design a Model-Weight Deployment Platform

Design a control plane that safely distributes large immutable model versions to serving fleets through staged rollout, verification, activation, and rollback.

Open practice

System designLast reported Aug 2026

Design Peer-to-Peer Model Distribution

Design a topology-independent peer-to-peer system that disseminates one large immutable model while respecting a shared per-node bandwidth limit.

Open practice

Project codingLast reported Aug 2026

Debug Extremely Randomized Trees (Fellow Program :)

Debug the provided Extremely Randomized Trees implementation so it is correct and no longer suffers bugs that cause crashes or poor accuracy.

Open practice

Project codingLast reported Aug 2026

Inference Engine (Fellow Program :D

Implement the request scheduler of an LLM inference engine, assigning prefill and decode work across progressively harder levels.

Open practice

System designLast reported Aug 2026

Design Production ML Serving Observability

Scale and optimize an existing online ML service using end-to-end metrics, traces, logs, controlled releases, and explicit overload behavior.

Open practice

Project coding

Repair an Agent and Reduce Its Turn Count

Repair a supplied agent, make it answer every question within two turns, then reduce the solution to one turn.

Open practice

03 · Evidence boundary

What “Anthropic interview questions” means here.

It means practicing transferable implementation, testing, and technical reasoning with public catalog assets FastPrep tags to Anthropic. It does not mean FastPrep has access to the company's assessments or any private interview bank.

Repeated public sightings and last-reported dates can help you prioritize practice, but they cannot predict the questions, format, or platform in a specific interview.

Only Anthropic-tagged FastPrep catalog problems appear above.
Stage labels and report dates remain visible as context.
No official, private, leaked, or proprietary questions are claimed.

04 · Plain answers

Anthropic interview practice questions, answered plainly.

This page owns technical-practice intent for Anthropic. Hiring activity, timelines, and market signals remain on the separate hiring-insights page.

01Does this page include Anthropic design or project practice?

Yes, when the public catalog supports it. This page currently links 11 system-design exercises, 0 low-level-design exercises, and 4 project-coding exercises tagged to Anthropic. Empty formats are omitted rather than padded with generic recommendations.

02Is FastPrep affiliated with Anthropic?

No. FastPrep is an independent interview-preparation product and is not affiliated with Anthropic. The page uses FastPrep's public practice catalog and does not claim official, private, leaked, or proprietary employer questions.

03How are Anthropic problems assigned to interview stages?

Stage labels come from FastPrep's public problem metadata. A problem can carry more than one reported stage, and hiring processes can change by role, level, location, and date. Treat the labels as preparation context, not a guarantee.

04Which Anthropic interview stage should I practice first?

Start with the stage named in your invitation or recruiter message. If no stage is known, use the largest available set to build general problem-solving fluency, then rehearse explanation and testing separately.

05Does this page predict the Anthropic interview process?

No. Public catalog counts, stage tags, and last-reported dates can help prioritize practice, but they cannot predict a specific interview's questions, sequence, timing, or platform.

Your next stage, made concrete

Pick a problem. Solve it end to end.

Start with the stage named in your invitation, then use public evidence as context—not as a promise of what you will be asked.

Open the practice set