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Practice coding, system design, behavioral, and project questions for frontier AI roles.
Every question has a public brief with the task, constraints, and follow-ups. Labels describe interactive practice access.
Reported interview periodN/A
The per-token price dropped to one fifth of its previous level while the prompt sets and reported traffic held steady, yet the monthly bill climbed. Build the account of where the money went, then defend the one fix you would ship.
Practice focusCost attribution, Experiment design, Token accounting, Root-cause analysis through a written response exercise.
Reported interview periodN/A
One session can carry hours of streamed output and far more history than the DOM should hold. Choose the transport, define what a resume means, and keep reading position and memory under control.
Practice focusStreaming protocols, Resume semantics, Incremental rendering, Virtualization 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
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
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.