/ For engineers

Every round you'll face,
out loud, on demand.

Three tracks tuned to the interviews that actually decide offers at senior tech companies.

Data structures & algorithms

Two-pointers, DP, graph traversals, sliding window — spoken through, out loud, under time pressure. The AI probes your reasoning, not just the answer.

ArraysTreesDPGraphsGreedy

System design

Design a URL shortener, a rate limiter, a global feed. The interviewer asks about scale, trade-offs, failure modes, and cost — like a staff engineer would.

ScalabilityConsistencyCachingQueuesSharding

Behavioral

STAR-format probing on conflict, ambiguity, ownership, failure. Get called out (kindly) when your story is vague, and coached toward a tighter version.

STARLeadershipConflictOwnership

mockmind · session log

> starting interview
> track: system-design | role: senior swe | difficulty: hard
> AI: "Let's design Twitter's home timeline. Where do you begin?"
> you: "Capacity planning — 300M DAU, ~200 tweets read per user..."
> AI: "Good. Push or pull? Defend it."
> you: "Hybrid — push for regular users, pull for celebrities..."
> AI [asks 6 follow-ups, probes failure modes, requests trade-offs]
> ...
> session ended · 47:12
> report generated · overall 84 / 100
> next: study replication lag & fan-out-on-read

Run your first round

Every round you'll face, out loud, on demand.

Data structures & algorithms

System design

Behavioral

Every round you'll face,
out loud, on demand.