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Question bank

Frontier AI technical interview question bank.

Practice coding, system design, behavioral, and project questions for frontier AI roles.

Company

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Frontier Rehearsal · Independent practice · Not affiliated with OpenAI, Anthropic, or xAI.

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Home
Question bank

Frontier AI technical interview question bank.

Practice coding, system design, behavioral, and project questions for frontier AI roles.

Company

FREE PRACTICE

Public demos, always pinned.

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Newest published questions; deterministic, never randomized.

Demo 1Number search with delayed feedback
Demo 2Design real-time device monitoring and control

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Filter question bank by interview groupAll 269 Coding 162 System design 48 Behavioral 29 Hiring manager 16 Project deep dive 14

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Filter question bank by topic tagsAll 269 Python 161 Algorithms 40 Data structures 46 Concurrency 27 Distributed systems 7 Storage & state 43 Networking 7 Reliability 30 ML / AI 27 Data / SQL 24 Security 7 Product design 25 Communication 66

Independent and not affiliated with the companies represented. Collected material does not predict future interview questions.

226 questions

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Question bank results

Every question has a public brief with the task, constraints, and follow-ups. Labels describe interactive practice access.

New public brief

Topic tags
Python
Concurrency
ML / AI

AnthropicCodingHalf AI-generated

Python codingWebAssembly + public tests

Reported interview periodSep 2025–Aug 2026

Build a Tool-Using Research Agent

You are given an LLM client whose responses may contain text blocks or one or more tool-call blocks. Build an agent that answers a user question by repeatedly calling the model, executing requested tools, retur…

Practice focusAssume two tools are available: a stock-price lookup and a shares-outstanding lookup. A question may require one lookup, several independent lookups, or combining results such as market capitalization. Requirements - Preserve the complete conversation history, including assistant tool calls and matching tool results. - Execute every tool call in a response; do not silently discard parallel calls. - Match each result to its tool-call identifier. - Stop only on a final model response, and return its text.…

New public brief

Topic tags
Python
Data structures
Storage & state

AnthropicCoding

Talk-through codingNo local grader

Reported interview periodApr 2026–Aug 2026

Convert Sampled Call Stacks into Events

A profiler periodically records the active call stack. Convert these snapshots into the minimal sequence of call-start and call-end events.

Practice focusEach sample has an integer timestamp and a stack ordered from outermost to innermost. Each output event contains the sample timestamp, an event type ( start or end ), and a frame name. Rules - Compare each stack with the previous stack using the longest common prefix. - End removed frames from innermost to outermost. - Start added frames from outermost to innermost. - Adjacent identical stacks produce no events. - Equal names at different depths represent different invocations. - Do not invent end events for calls still active in the last sample.…

Build a Tool-Using Research Agent

Convert Sampled Call Stacks into Events

Ordered IPv4 Firewall Rules

Design an interactive model-backed product feature

Recruiter screen: motivation, fit, and career narrative

Engineering Management Fundamentals

Implement Batched Scaled Dot-Product Attention

First-fit heap blocks

Build and Scale an Image-Transformation Pipeline

Find Duplicate Files Efficiently

Iterator that can pause and resume

Online softmax entropy

Token-level streaming differ with rollback

Debug sharded matrix-multiplication gradients

Decode a Nested String

Design a Multi-User AI Assistant

Column order of a binary tree

Build a Temporal In-Memory Database with Backup and Restore

Repair a Looping Instruction Program

Infer return types in a tiny generic type system

Build a Bank Ledger with Held Transfers and Account Merges

Implement a Longest-Match Tokenizer

Shortest distinguishing prefix per word

Implement a Versioned Recipe Manager

Build a Tool-Using Research Agent

Convert Sampled Call Stacks into Events

Ordered IPv4 Firewall Rules

Design an interactive model-backed product feature

Recruiter screen: motivation, fit, and career narrative

Engineering Management Fundamentals

Implement Batched Scaled Dot-Product Attention

First-fit heap blocks

Build and Scale an Image-Transformation Pipeline

Find Duplicate Files Efficiently

Iterator that can pause and resume

Online softmax entropy

Token-level streaming differ with rollback

Debug sharded matrix-multiplication gradients

Decode a Nested String

Design a Multi-User AI Assistant

Column order of a binary tree

Build a Temporal In-Memory Database with Backup and Restore

Repair a Looping Instruction Program

Infer return types in a tiny generic type system

Build a Bank Ledger with Held Transfers and Account Merges

Implement a Longest-Match Tokenizer

Shortest distinguishing prefix per word

Implement a Versioned Recipe Manager