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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.

213 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

ByteDanceCoding

Talk-through codingNo local grader

Reported interview periodNot available

Best Time to Buy and Sell Stock

Given daily prices, compute the maximum profit obtainable by buying once and selling once later. You may choose not to trade, in which case the profit is 0.

Practice focusPrices are non-negative integers. An empty or one-day input returns 0 . Solve the problem in O(n) time and O(1) auxiliary space. Staged follow-ups 1. Allow any number of non-overlapping transactions while holding at most one share. 2. Add a fixed transaction fee or a one-day cooldown after selling. 3. Return the chosen buy and sell days with deterministic tie-breaking.

New public brief

Topic tags
Python
Algorithms

ByteDanceCoding

Talk-through codingNo local grader

Reported interview periodNot available

Binary Search

Given a strictly increasing array of integers and a target, return the target's index or -1 when it is absent.

Practice focusThe solution must run in O(log n) time and use O(1) auxiliary space. An empty array returns -1 . Staged follow-ups 1. Return the first position where the target could be inserted while preserving order. 2. Support duplicate values by returning the first matching index. 3. Search a conceptually unbounded sorted data source through a bounded-access interface.

New public brief

Topic tags
Python

ByteDanceCoding

Talk-through codingNo local grader

Reported interview periodNot available

Count Values with an Even Number of Digits

Given a list of positive integers, return how many contain an even number of decimal digits.

Practice focusFor example, [12, 345, 2, 6, 7896] returns 2 . Assume every value is positive and fits in a signed 32-bit integer. Target O(n) time. Staged follow-ups 1. Extend the definition to include zero and negative integers without counting a sign. 2. Avoid converting numbers to strings. 3. Count digits in an arbitrary base supplied at runtime.

New public brief

Topic tags
Python
Storage & state

ByteDanceCoding

Talk-through codingNo local grader

Reported interview periodNot available

Course Schedule

There are num_courses courses labeled 0 through num_courses - 1. Each prerequisite pair (course, prerequisite) states that the prerequisite must be completed first.

Practice focusImplement: Return whether it is possible to complete every course. Courses with no edges are valid, and duplicate prerequisite pairs should not change the answer. Aim for O(V + E) time. Staged follow-ups 1. Return one valid course order, or an empty list when none exists. 2. Return an explicit cycle to explain why the schedule is impossible. 3. Process prerequisite additions incrementally and reject an addition that creates a cycle.

New public brief

Topic tags
Python

ByteDanceCoding

Talk-through codingNo local grader

Reported interview periodNot available

Maximum Non-Adjacent Sum

Each value in amounts is the reward available at one location. You may select any subset, but cannot select two adjacent locations. Return the largest total reward.

Practice focusAssume rewards are non-negative. The empty input returns 0 . Produce an O(n) -time solution and then reduce its auxiliary space to O(1) . Staged follow-ups 1. Return the selected indices, with deterministic tie-breaking. 2. Arrange the locations in a circle, so the first and last are also adjacent. 3. Generalize to a tree where directly connected nodes cannot both be selected.

Best Time to Buy and Sell Stock

Binary Search

Count Values with an Even Number of Digits

Course Schedule

Maximum Non-Adjacent Sum

Palindrome Integer

A board of ten scores

After launch

Maximum profit from repeated stock trades

Reconcile noisy annotator labels

Batch inference requests under a capacity budget

Apply sequential line edits to a file

Sliding-window rate limiter

Interval calendar

Nested dictionary transforms

Command-log store

Dependency-ready scheduler

Streaming metric window

Evaluation slice aggregator

Defend your role fit

Prepare one project deep dive

Negotiate an ambiguous role scope

Trace a project from claim to evidence

Choose between two urgent priorities

Best Time to Buy and Sell Stock

Binary Search

Count Values with an Even Number of Digits

Course Schedule

Maximum Non-Adjacent Sum

Palindrome Integer

A board of ten scores

After launch

Maximum profit from repeated stock trades

Reconcile noisy annotator labels

Batch inference requests under a capacity budget

Apply sequential line edits to a file

Sliding-window rate limiter

Interval calendar

Nested dictionary transforms

Command-log store

Dependency-ready scheduler

Streaming metric window

Evaluation slice aggregator

Defend your role fit

Prepare one project deep dive

Negotiate an ambiguous role scope

Trace a project from claim to evidence

Choose between two urgent priorities