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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
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
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.
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
Aggregate pass rates, enforce minimum support, and compare evaluation runs without hiding weak slices.
Practice focusPython, Aggregation, Evaluation, Statistical hygiene, Determinism through a runnable coding exercise.
Reported interview periodN/A
Turn one real experience into a concise story, then answer increasingly specific follow-ups without inventing evidence.
Practice focusEvidence selection, Concise communication, Conflict, Reflection 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
Design a reproducible registry connecting datasets, evaluator configurations, model outputs, and reviewed results.
Practice focusData lineage, Versioning, Idempotency, Access control, Reproducibility 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
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
After a deploy the cache is empty and every request misses. Design a warming path that keeps origin load bounded, then explain how readers stay correct when warming dies halfway.
Practice focusCaching, Backpressure, Failure recovery through a written response exercise.
Reported interview periodN/A
Every serving host needs the new 500 GB checkpoint before it can switch versions. Design the delivery path so transfer, verification, activation, and recovery do not collide.
Practice focusArtifact distribution, Integrity verification, Rollout control, Fleet recovery through a written response exercise.
Reported interview periodN/A
High-volume document review needs extraction, model judgment, evidence links, and a human queue whose decisions can be defended later. Design the pipeline and the versioning that keep it auditable.
Practice focusPipeline design, Evidence linking, Human-in-the-loop review, Versioning through a written response exercise.
Reported interview periodN/A
One latency-sensitive workload and one throughput workload must coexist on eight GPUs. Define who gets in, how batches form, when preemption is allowed, and how both promises survive a lost GPU.
Practice focusScheduling policy, Batching, Fairness, Failure recovery through a written response exercise.
Reported interview periodN/A
Design a sequence that stays fast to index, accepts mutation, and can crash at any point without losing the state a reader already saw. Then make the restart path provable rather than plausible.
Practice focusData structure design, Complexity analysis, Durability, Crash recovery through a written response exercise.
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
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.