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Browse independent practice aligned to xAI: coding, system design, and project practice. Practice progressive coding, concurrency, distributed systems, GPU-oriented reasoning, inference infrastructure, and system design for software and ML engineering roles.
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 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 linkAccording 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 linkCandidate 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 linkEvidence reviewed . Reports can become stale.
Every question has a public brief with the task, constraints, and follow-ups. Labels describe interactive practice access.
Reported interview periodN/A
Practice making a visible priority call when reliability work and a strategic launch compete for the same team.
Practice focusPrioritization, Trade-offs, Risk, Stakeholder communication, Decision review through a written response exercise.
Reported interview periodN/A
Practice turning a research, product, and infrastructure disagreement into an owned decision without flattening the real risks.
Practice focusDisagreement, Decision rights, Cross-functional leadership, Escalation, Communication through a written response exercise.
Reported interview periodN/A
Build a precise account of a failed technical decision, your personal responsibility, the recovery, and the later behavior that changed.
Practice focusOwnership, Failure analysis, Recovery, Reflection, Trust repair through a written response exercise.
Reported interview periodN/A
Practice showing how you improved a team’s decisions or delivery beyond the output of your own individual work.
Practice focusLeadership, Delegation, Mentorship, Team systems, Impact through a written response exercise.
Reported interview periodN/A
A code-generation path drafts edits and a stronger model checks them. Decide which spans are accepted or rolled back, keep the result correct, and show whether the second pass actually saves time.
Practice focusSpeculative execution, Verification design, Rollback, Correctness, Benchmarking through a written response exercise.
Reported interview periodN/A
You get a short list of accepted two-word phrases and a batch of strings. Infer the rule that decides which strings belong together, implement it so the same input always yields the same partition, and say where the examples still underdetermine the answer.
Practice focusString algorithms, Specification recovery, Determinism, Edge-case analysis through a written response exercise.
Reported interview periodN/A
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.
Reported interview periodN/A
Return the vials that stayed inside a temperature range for their whole stay.
Practice focusScanning, Missing data through a written response exercise.
Reported interview periodN/A
Collapse consecutive comments on the same path into one batch.
Practice focusOrder, Grouping through a written response exercise.
Reported interview periodN/A
Return one valid order of steps, or report a cycle.
Practice focusOrdering, Cycles through a written response exercise.
Reported interview periodN/A
Two people edit one note and need to see who wrote the last line.
Practice focusConflict, Failure through a written response exercise.
Reported interview periodN/A
Store a score per model run and show which run is ahead this week.
Practice focusRead path, Write path through a written response exercise.
Reported interview periodN/A
A story about slowing a launch because a safety check was thin.
Practice focusJudgment, A specific story through a written response exercise.
Reported interview periodN/A
A disagreement about training on customer text.
Practice focusDisagreement, Limits through a written response exercise.
Reported interview periodN/A
Two minutes on why this lab's work fits a project you have done.
Practice focusA concrete project through a written response exercise.
Reported interview periodN/A
What you would cut if the team lost half its people.
Practice focusPriorities, A hard conversation through a written response exercise.
Reported interview periodN/A
Where a design failed after launch, what you measured, and what you changed.
Practice focusA shipped system, Measurement through a written response exercise.
Reported interview periodN/A
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.
Reported interview periodN/A
Explain one result you trust, what would falsify it, and what was not shown.
Practice focusEvidence, Limits through a written response exercise.