Search the siteSearch in

Interview paths
Question bank
Coding practice
Study materials
Infrastructure lab

Community

Weekly sessions
Peer practice
Contribute

News

Jobs

Open roles
Market intelligence
Companies
Roles

Feedback

Product feedback
Developer feedback

Checking account…

Home
Question bank

Frontier AI technical interview question bank.

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

Company

Loading the question catalog…

Preparing this page…

Your current navigation and account state stay available while the next page loads.

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

Home Interview questions Company interview processes Company reports Role reports Market intelligence Open roles Python lab Materials How it works About Feedback Uploads Feature requests Terms Privacy 中文 English

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.

Start with either demo. They remain here when you filter or sort.

Free account: sign in to practice the marked Free questions.

Newest published questions; deterministic, never randomized.

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

Question bank filters

Reset filters

Question groups

Filter question bank by interview groupAll 161 Coding 161 System design 0 Behavioral 0 Hiring manager 0 Project deep dive 0

Topics

Filter question bank by topic tagsAll 162 Python 161 Algorithms 36 Data structures 36 Concurrency 19 Distributed systems 7 Storage & state 23 Networking 6 Reliability 9 ML / AI 12 Data / SQL 17 Security 4 Product design 9 Communication 5

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

161 questions

Sort question bankSortFree first Newest Oldest AI ratio ↓AI ratio ↑

Coding results

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

Public brief

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Maximum profit from repeated stock trades

You are given a price for each trading day and may complete as many round trips as you like, holding at most one share at a time. Report the largest total gain reachable across the whole window.

Practice focusRequirements - The input has two lines: a day count, then that many space-separated integer prices on the second line. The count matches the number of prices. - A round trip means buying one share on some day and selling it on a later day; positions cannot overlap and short selling is not allowed. - Return the total profit as a plain decimal string. A window with no profitable round trip, including a single day, yields 0 . - Prices are non-negative integers and the day count is at least one.…

New public brief

Topic tags
Python

Scale AICodingAI-generated

Python codingWebAssembly + public tests

Reported interview periodNot available

Reconcile noisy annotator labels

Three annotators label each item and report an integer confidence. Produce the final label by weighted vote and count the items where every annotator agreed.

Practice focus- The first line is the item count n . Each of the next n lines has exactly three <label :<confidence pairs, where the label is A or B and the confidence is a nonnegative integer. - Sum the confidence per label. Return A when its total is higher, B when its total is higher, and ABSTAIN on an exact tie. - After the per-item labels, return one final line agreed=<count , where an item is agreed only when all three raw labels match. - Return one label per item in input order, then the agreement line. Do not append a trailing newline.

New public brief

Topic tags
Python

NVIDIACodingAI-generated

Python codingWebAssembly + public tests

Reported interview periodNot available

Batch inference requests under a capacity budget

A serving path receives requests in order. Pack them greedily into batches that respect both a total-size capacity and a maximum request count, then report the batch count and batch sizes.

Practice focus- The first line has two integers: the batch capacity C and the maximum request count per batch B . The second line is the request count n , and the third line has n request sizes. - Walk the requests in input order. Add the next request to the current batch when the total size stays within C and the count stays within B ; otherwise close the batch and start a new one. - Every request must be placed exactly once, in order; a request equal to C forms its own batch. - Return batches=<count ;sizes=<s1 ,<s2 ,... with the batch totals in order.…

New public brief

Topic tags
Python

CursorCodingAI-generated

Python codingWebAssembly + public tests

Reported interview periodNot available

Apply sequential line edits to a file

An editing agent proposes line-range replacements against a small document. Apply them in order, with each edit seeing the document produced by the previous one, and report the final content.

Practice focus- The first line is the current line count m , followed by the m document lines. The next line is the edit count k , then k edit lines. - Each edit line is <start <end <replacement with 1-based inclusive bounds over the current document. Replace those lines with the single replacement line, preserving spaces inside the replacement. - Apply edits sequentially; later edits index the already-updated document. All edits are valid. - Return the final document lines, then a final line lines=<count . Do not append a trailing newline.

Public brief

Topic tags
Python
Algorithms
ML / AI
Product design

Coding exerciseCodingAI-generated

Practice formatRunnable coding45–70 min

Reported interview periodN/A

Build a token-budget batcher

Implement a small batching primitive, then adapt it to padded cost, bounded output, and production reasoning.

Practice focusPython, Greedy algorithms, Boundary cases, ML batching, Complexity through a runnable coding exercise.

Public brief

Topic tags
Python
Algorithms
Data structures
Storage & state
Networking

Coding exerciseCodingAI-generated

Practice formatRunnable coding45 min

Reported interview periodN/A

Sliding-window rate limiter

Build a limiter, then add quota reporting, retry timing, and independent keys.

Practice focusPython, Queues, State, Boundary cases, Complexity through a runnable coding exercise.

Public brief

Topic tags
Python
Algorithms
Data structures
Product design
Communication

Coding exerciseCodingAI-generated

Practice formatRunnable coding45 min

Reported interview periodN/A

Interval calendar

Reason about half-open intervals through conflicts, room counts, merging, and free slots.

Practice focusPython, Sorting, Intervals, Heaps, Edge cases through a runnable coding exercise.

Public brief

Topic tags
Python

Coding exerciseCodingAI-generated

Practice formatRunnable coding45 min

Reported interview periodN/A

Nested dictionary transforms

Flatten and reconstruct nested data, then support path access and lists.

Practice focusPython, Recursion, Data transformation, JSON-like data through a runnable coding exercise.

Public brief

Topic tags
Python
Storage & state

Coding exerciseCodingAI-generated

Practice formatRunnable coding45 min

Reported interview periodN/A

Command-log store

Evolve a tiny state machine through undo, compaction, and snapshot replay.

Practice focusPython, State machines, Undo logs, Compaction, Persistence through a runnable coding exercise.

Public brief

Topic tags
Python
Data structures
Reliability
Data / SQL

Coding exerciseCodingAI-generated

Practice formatRunnable coding50 min

Reported interview periodN/A

Dependency-ready scheduler

Turn a dependency graph into stable ready sets, execution layers, and failure impact.

Practice focusPython, Graphs, Stable ordering, Cycle detection, Failure analysis through a runnable coding exercise.

Public brief

Topic tags
Python
Data structures
Storage & state

Coding exerciseCodingAI-generated

Practice formatRunnable coding50 min

Reported interview periodN/A

Streaming metric window

Compute ordered rolling metrics, then partition state and expose freshness explicitly.

Practice focusPython, Queues, Streaming state, Boundaries, Observability through a runnable coding exercise.

Public brief

Topic tags
Python
Data / SQL

Coding exerciseCodingAI-generated

Practice formatRunnable coding50 min

Reported interview periodN/A

Evaluation slice aggregator

Aggregate pass rates, enforce minimum support, and compare evaluation runs without hiding weak slices.

Practice focusPython, Aggregation, Evaluation, Statistical hygiene, Determinism through a runnable coding exercise.

Public brief

Topic tags
Python
Data structures

Coding exerciseCoding

Practice formatWritten response35 minutes

Reported interview periodN/A

Grade book

An in-memory grade book with a ranking that does not treat a missing score as zero.

Practice focusState, Ranking, Edge cases through a written response exercise.

Public brief

Topic tags
Python
Algorithms

Coding exerciseCoding

Practice formatWritten response35 minutes

Reported interview periodN/A

Vial log

Return the vials that stayed inside a temperature range for their whole stay.

Practice focusScanning, Missing data through a written response exercise.

Public brief

Topic tags
Python
Algorithms

Coding exerciseCoding

Practice formatWritten response35 minutes

Reported interview periodN/A

Comment batches

Collapse consecutive comments on the same path into one batch.

Practice focusOrder, Grouping through a written response exercise.

Public brief

Topic tags
Python
Algorithms
Data structures

Coding exerciseCoding

Practice formatWritten response40 minutes

Reported interview periodN/A

Launch order

Return one valid order of steps, or report a cycle.

Practice focusOrdering, Cycles through a written response exercise.

Public brief

Topic tags
Python

Coding exerciseCoding

Practice formatWritten responseA weekend

Reported interview periodN/A

Notes table

Turn a folder of notes into a table of titles and word counts.

Practice focusA small program, What you left out through a written response exercise.

Previous7 of 7Next

Browse all original practice

Build a token-budget batcher
Sliding-window rate limiter
Interval calendar
Nested dictionary transforms
Command-log store
Dependency-ready scheduler
Streaming metric window
Evaluation slice aggregator
Build a reliable job runner
Build one adaptable decision story
Defend your role fit
Prepare one project deep dive
Design an evaluation artifact registry
Defend a reversible launch decision
Negotiate an ambiguous role scope
Trace a project from claim to evidence
Choose between two urgent priorities
Resolve a cross-functional disagreement
Own a consequential failure
Increase a team’s leverage
Warm a cold cache without a thundering herd
Ship a 500 GB checkpoint without a startup stampede
Make every document decision traceable to evidence
Share eight GPUs between two workloads with different promises
A mutable indexed sequence that must restart exactly
Trace a falling unit price to a rising bill
Keep a very long conversation usable while it streams
Design durable scheduled publishing
Make speculative code edits safe to accept
Recover a grouping rule from two-word phrases

CONTENT BOUNDARY

Independent frontier AI interview practice. Includes adaptations of collected interview material and original exercises; not official company questions and not affiliated with the companies represented. Collected material does not predict future interview questions. Report a correction.

Loading the question catalog…

FREE PRACTICE

Public demos, always pinned.

Start with either demo. They remain here when you filter or sort.

Free account: sign in to practice the marked Free questions.

Newest published questions; deterministic, never randomized.

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

Question bank filters

Reset filters

Question groups

Filter question bank by interview groupAll 161 Coding 161 System design 0 Behavioral 0 Hiring manager 0 Project deep dive 0

Topics

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

161 questions

Sort question bankSortFree first Newest Oldest AI ratio ↓AI ratio ↑

Coding results

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

Public brief

Topic tags
Python

MetaCoding

Python codingWebAssembly + public tests

Reported interview periodNot available

Maximum profit from repeated stock trades

You are given a price for each trading day and may complete as many round trips as you like, holding at most one share at a time. Report the largest total gain reachable across the whole window.

New public brief

Topic tags
Python

Scale AICodingAI-generated

Python codingWebAssembly + public tests

Reported interview periodNot available

Reconcile noisy annotator labels

Three annotators label each item and report an integer confidence. Produce the final label by weighted vote and count the items where every annotator agreed.

New public brief

Topic tags
Python

NVIDIACodingAI-generated

Python codingWebAssembly + public tests

Reported interview periodNot available

Batch inference requests under a capacity budget

A serving path receives requests in order. Pack them greedily into batches that respect both a total-size capacity and a maximum request count, then report the batch count and batch sizes.

New public brief

Topic tags
Python

CursorCodingAI-generated

Python codingWebAssembly + public tests

Reported interview periodNot available

Apply sequential line edits to a file

An editing agent proposes line-range replacements against a small document. Apply them in order, with each edit seeing the document produced by the previous one, and report the final content.

Public brief

Topic tags
Python
Algorithms
ML / AI
Product design

Coding exerciseCodingAI-generated

Practice formatRunnable coding45–70 min

Reported interview periodN/A

Build a token-budget batcher

Implement a small batching primitive, then adapt it to padded cost, bounded output, and production reasoning.

Practice focusPython, Greedy algorithms, Boundary cases, ML batching, Complexity through a runnable coding exercise.

Public brief

Topic tags
Python
Algorithms
Data structures
Storage & state
Networking

Coding exerciseCodingAI-generated

Practice formatRunnable coding45 min

Reported interview periodN/A

Sliding-window rate limiter

Build a limiter, then add quota reporting, retry timing, and independent keys.

Practice focusPython, Queues, State, Boundary cases, Complexity through a runnable coding exercise.

Public brief

Topic tags
Python
Algorithms
Data structures
Product design
Communication

Coding exerciseCodingAI-generated

Practice formatRunnable coding45 min

Reported interview periodN/A

Interval calendar

Reason about half-open intervals through conflicts, room counts, merging, and free slots.

Practice focusPython, Sorting, Intervals, Heaps, Edge cases through a runnable coding exercise.

Public brief

Topic tags
Python

Coding exerciseCodingAI-generated

Practice formatRunnable coding45 min

Reported interview periodN/A

Nested dictionary transforms

Flatten and reconstruct nested data, then support path access and lists.

Practice focusPython, Recursion, Data transformation, JSON-like data through a runnable coding exercise.

Public brief

Topic tags
Python
Storage & state

Coding exerciseCodingAI-generated

Practice formatRunnable coding45 min

Reported interview periodN/A

Command-log store

Evolve a tiny state machine through undo, compaction, and snapshot replay.

Practice focusPython, State machines, Undo logs, Compaction, Persistence through a runnable coding exercise.

Public brief

Topic tags
Python
Data structures
Reliability
Data / SQL

Coding exerciseCodingAI-generated

Practice formatRunnable coding50 min

Reported interview periodN/A

Dependency-ready scheduler

Turn a dependency graph into stable ready sets, execution layers, and failure impact.

Practice focusPython, Graphs, Stable ordering, Cycle detection, Failure analysis through a runnable coding exercise.

Public brief

Topic tags
Python
Data structures
Storage & state

Coding exerciseCodingAI-generated

Practice formatRunnable coding50 min

Reported interview periodN/A

Streaming metric window

Compute ordered rolling metrics, then partition state and expose freshness explicitly.

Practice focusPython, Queues, Streaming state, Boundaries, Observability through a runnable coding exercise.

Public brief

Topic tags
Python
Data / SQL

Coding exerciseCodingAI-generated

Practice formatRunnable coding50 min

Reported interview periodN/A

Evaluation slice aggregator

Aggregate pass rates, enforce minimum support, and compare evaluation runs without hiding weak slices.

Practice focusPython, Aggregation, Evaluation, Statistical hygiene, Determinism through a runnable coding exercise.

Public brief

Topic tags
Python
Data structures

Coding exerciseCoding

Practice formatWritten response35 minutes

Reported interview periodN/A

Grade book

An in-memory grade book with a ranking that does not treat a missing score as zero.

Practice focusState, Ranking, Edge cases through a written response exercise.

Public brief

Topic tags
Python
Algorithms

Coding exerciseCoding

Practice formatWritten response35 minutes

Reported interview periodN/A

Vial log

Return the vials that stayed inside a temperature range for their whole stay.

Practice focusScanning, Missing data through a written response exercise.

Public brief

Topic tags
Python
Algorithms

Coding exerciseCoding

Practice formatWritten response35 minutes

Reported interview periodN/A

Comment batches

Collapse consecutive comments on the same path into one batch.

Practice focusOrder, Grouping through a written response exercise.

Public brief

Topic tags
Python
Algorithms
Data structures

Coding exerciseCoding

Practice formatWritten response40 minutes

Reported interview periodN/A

Launch order

Return one valid order of steps, or report a cycle.

Practice focusOrdering, Cycles through a written response exercise.

Public brief

Topic tags
Python

Coding exerciseCoding

Practice formatWritten responseA weekend

Reported interview periodN/A

Notes table

Turn a folder of notes into a table of titles and word counts.

Practice focusA small program, What you left out through a written response exercise.

Previous7 of 7Next

Browse all original practice

Build a token-budget batcher
Sliding-window rate limiter
Interval calendar
Nested dictionary transforms
Command-log store
Dependency-ready scheduler
Streaming metric window
Evaluation slice aggregator
Build a reliable job runner
Build one adaptable decision story
Defend your role fit
Prepare one project deep dive
Design an evaluation artifact registry
Defend a reversible launch decision
Negotiate an ambiguous role scope
Trace a project from claim to evidence
Choose between two urgent priorities
Resolve a cross-functional disagreement
Own a consequential failure
Increase a team’s leverage
Warm a cold cache without a thundering herd
Ship a 500 GB checkpoint without a startup stampede
Make every document decision traceable to evidence
Share eight GPUs between two workloads with different promises
A mutable indexed sequence that must restart exactly
Trace a falling unit price to a rising bill
Keep a very long conversation usable while it streams
Design durable scheduled publishing
Make speculative code edits safe to accept
Recover a grouping rule from two-word phrases

CONTENT BOUNDARY