xAI interview questions for engineers

CANDIDATE-REPORTED · INDEPENDENT SYNTHESIS

What candidates report about the interview

3 reviewed signals

Use these reports to choose what to rehearse, not to predict a fixed loop. Formats vary by role, team, and date; confirm your current process with the recruiter. Frontier Rehearsal is independent and not company-endorsed.

Practice promptsOriginal exercises shaped by recurring preparation themes—not reported interview questions.1

Practice prompt (not a reported interview question): implement a small infrastructure-flavoured function with clear inputs and outputs, then compare your production-oriented solution with an algorithm-first alternative and justify which constraints matter most.
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Process signalsReported stages, formats, timing, and role-specific variations.2

According to candidate reports, xAI's 45-minute backend tech screen is a coding round that asks for something functional, such as an API endpoint or a data-processing function, with some architecture discussion but not a full system-design round.
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Candidate reports describe an xAI coding round delivered in Python and bash over about 45 minutes, focused on day-to-day engineering tasks rather than LeetCode-style puzzles.
Open permanent link

Evidence reviewed Nov 12, 2026. Reports can become stale.

Question groups

Topics

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

2 questions

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

Public brief

Topic tags
Python
Reliability

xAICoding

Python codingWebAssembly + public tests

Reported interview periodDec 2025

Identify Faulty Nodes with Group Tests

There are n compute nodes with IDs 0 through n - 1. A supplied function test(group) returns True exactly when every node in group is healthy. A test group must contain at least two node IDs. Assume at least two…

Practice focusImplement: Return every faulty node ID in ascending order. Minimize unnecessary tests, but prioritize correctness. Do not assume that testing one node is legal. The supplied run case owns fault labels and the test callback; implement only find faulty nodes . Each test must contain at least two distinct valid non-boolean integer IDs. The public safety budget is at most n (n-1)//2 + n-1 callback calls; it admits pair discovery followed by classification and is not an optimality claim. Nodes are fixed during a run, and n is an integer at least two.…

Public brief

Topic tags
Python
Data structures
Reliability
Data / SQL

Coding exerciseCodingAI-generated

Runnable 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.

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CANDIDATE-REPORTED · INDEPENDENT SYNTHESIS

What candidates report about the interview

3 reviewed signals

Use these reports to choose what to rehearse, not to predict a fixed loop. Formats vary by role, team, and date; confirm your current process with the recruiter. Frontier Rehearsal is independent and not company-endorsed.

Practice promptsOriginal exercises shaped by recurring preparation themes—not reported interview questions.1

Practice prompt (not a reported interview question): implement a small infrastructure-flavoured function with clear inputs and outputs, then compare your production-oriented solution with an algorithm-first alternative and justify which constraints matter most.
Open permanent link

Process signalsReported stages, formats, timing, and role-specific variations.2

According to candidate reports, xAI's 45-minute backend tech screen is a coding round that asks for something functional, such as an API endpoint or a data-processing function, with some architecture discussion but not a full system-design round.
Open permanent link
Candidate reports describe an xAI coding round delivered in Python and bash over about 45 minutes, focused on day-to-day engineering tasks rather than LeetCode-style puzzles.
Open permanent link

Evidence reviewed Nov 12, 2026. Reports can become stale.

Question groups

Topics

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

2 questions

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

Public brief

Topic tags
Python
Reliability

xAICoding

Python codingWebAssembly + public tests

Reported interview periodDec 2025

Identify Faulty Nodes with Group Tests

There are n compute nodes with IDs 0 through n - 1. A supplied function test(group) returns True exactly when every node in group is healthy. A test group must contain at least two node IDs. Assume at least two…

Practice focusImplement: Return every faulty node ID in ascending order. Minimize unnecessary tests, but prioritize correctness. Do not assume that testing one node is legal. The supplied run case owns fault labels and the test callback; implement only find faulty nodes . Each test must contain at least two distinct valid non-boolean integer IDs. The public safety budget is at most n (n-1)//2 + n-1 callback calls; it admits pair discovery followed by classification and is not an optimality claim. Nodes are fixed during a run, and n is an integer at least two.…

Public brief

Topic tags
Python
Data structures
Reliability
Data / SQL

Coding exerciseCodingAI-generated

Runnable 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.

xAI interview questions for engineering roles

xAI interview questions for engineering roles

What candidates report about the interview

Identify Faulty Nodes with Group Tests

Dependency-ready scheduler

What candidates report about the interview

Identify Faulty Nodes with Group Tests

Dependency-ready scheduler