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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 periodNot available
Ten people store one score per run and look at which run is ahead this week.
Practice focusSystem design round. Ten people record one score per run. Say what a week means and what a missing score shows. Walk the write and the read. A score arrives twice for the same run. Keep the first. Stop when the board can say this week is still open.
Reported interview periodNot available
A story about slowing a launch because a safety check was thin.
Practice focusBehavioral round. The interviewer asks for a time you slowed a launch. Answer in this order: the date range, the check, the person, your sentence, their reply, and the agreement. Then they ask what you would have done if the launch could not move. Give the cut you would have made. Then they ask how you knew the check was enough the second time. Point at the measurement, not a feeling. Stay on one project.
Reported interview periodNot available
Where a design failed after launch, what you measured, and what you changed.
Practice focusProject round. One system, after launch. Start with the design you intended. Then the failure, including who felt it. Then the measurement, including the unit and the window. Then the change. The interviewer asks what you left alone and why. Answer with one thing you refused to change. Then they ask how you would know the failure had returned. Point at the same measurement. Do not switch projects.
Reported interview periodNot available
One behavioral story about stopping a decision that was moving too fast.
Practice focusBehavioral round. Tell one story about stopping a decision that was moving too fast. What the decision was. Who was in the room. The sentence you used. What they said back. What you agreed to measure before continuing. Stay on that one story.
Reported interview periodNot available
A culture conversation about a claim you would not publish unchecked.
Practice focusCulture round. Someone wants to publish a claim you have not checked. What the claim is. What evidence is missing. What you would ship instead. Who you would tell if they publish it anyway.
Reported interview periodNot available
Model an eight-by-eight board. Each piece is one side's, and each piece is regular or king. There is no hidden grader. The work is the data model and the method boundaries.
Practice focusRequirements - A move check confirms the piece belongs to the player, the destination is empty, the step is diagonal, and the direction matches the piece type. - A capture jumps an opposing piece and may continue in a chain. - A piece that reaches the far row becomes a king. - The game ends when the opponent has no pieces or no legal move. - Represent the board as a grid of optional pieces. - Say whether each move returns a new board or changes the old one.…
Reported interview periodNot available
Tell one story where you shipped a bounded first version, learned that an assumption was wrong, and corrected it quickly. State the boundary, signal, correction, and impact without hiding the original mistake.
Practice focusPreparation - Write the user or stakeholder, the constraint, and the decision in one sentence each. - Choose one measurement or observable fact that can support the answer. - Name one alternative and the reason it was not selected. Review checklist 1. Did I state the concrete constraint before describing the solution? 2. Did I separate my own decision and work from the team's work? 3. Did I name evidence or a measurement rather than relying on confidence? 4. Can I answer every follow-up without changing the original facts? Staged follow-ups 1.…
Reported interview periodN/A
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.
Reported interview periodN/A
Build a limiter, then add quota reporting, retry timing, and independent keys.
Practice focusPython, Queues, State, Boundary cases, Complexity through a runnable coding exercise.
Reported interview periodN/A
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.
Reported interview periodN/A
Flatten and reconstruct nested data, then support path access and lists.
Practice focusPython, Recursion, Data transformation, JSON-like data through a runnable coding exercise.
Reported interview periodN/A
Evolve a tiny state machine through undo, compaction, and snapshot replay.
Practice focusPython, State machines, Undo logs, Compaction, Persistence through a runnable coding exercise.
Reported interview periodN/A
Compute ordered rolling metrics, then partition state and expose freshness explicitly.
Practice focusPython, Queues, Streaming state, Boundaries, Observability through a runnable coding exercise.
Reported interview periodN/A
Review staged prompts that begin with a small in-memory worker, then introduce retries, duplication, cancellation, and process restarts.
Practice focusState modeling, Idempotency, Retry policy, Failure recovery, Operational reasoning through a written response exercise.
Reported interview periodN/A
Connect motivation and scope to evidence from your work, then handle gaps, priorities, and expectations directly.
Practice focusMotivation, Role fit, Scope, Self-awareness, Questions through a written response exercise.
Reported interview periodN/A
Build a defensible walkthrough of a project from problem framing to architecture, experiments, failures, and outcomes.
Practice focusArchitecture, Experiment design, Debugging, Metrics, Trade-offs through a written response exercise.
Reported interview periodN/A
Use one real experience to show how you made a consequential decision under incomplete evidence and designed a safe reversal path.
Practice focusJudgment, Evidence, Disagreement, Risk control, Reflection through a written response exercise.
Reported interview periodN/A
Practice aligning a broad research-engineering role with evidence, boundaries, first-quarter priorities, and questions for the manager.
Practice focusRole fit, Prioritization, Scope, Self-awareness, Manager questions through a written response exercise.
Reported interview periodN/A
Prepare a technical project account that connects the initial claim, experiment design, implementation choices, failures, and shipped evidence.
Practice focusProblem framing, Experiment design, Architecture, Debugging, Evidence quality through a written response exercise.
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 posting product lets an author write now and publish later. Design the path from submission to publication, then keep it correct when authors edit, cancel, and retry while delivery fans out to followers.
Practice focusDurable scheduling, Idempotency, Race conditions, Time zones, Operational telemetry through a written response exercise.