You get a prompt.
Sixty seconds.
No script.
Then you get a breakdown of exactly what happened — timestamped, quoted from your own words, with one concrete thing to fix next time.
Pick what you're drilling.
System design. Architecture. Engineering trade-offs.
Prompts across three difficulty tiers — from explaining what a load balancer does, to designing a distributed rate-limiter across five global regions under expert time pressure.
“Explain what a Load Balancer is and why it's critical for scale.”
“How do you handle race conditions in an inventory system during a flash sale?”
“Design a distributed rate-limiting architecture spanning 5 global cloud regions.”
For engineers prepping for system design interviews, or anyone who needs to explain complex systems clearly.
Impromptu speaking. Debate. Storytelling. Fluency.
Prompts from beginner casual topics to expert-level arguments. Practice being comfortable speaking on anything, in front of anyone.
“What is one hobby you wish you had started earlier?”
“Is failure a necessary step toward achieving true success?”
“Convince an audience that privacy is more valuable than convenience.”
Specific feedback.
Not a vague summary.
Every finding is timestamped and quoted verbatim from your own words — so you know exactly when something happened and what to say differently.
“Design a distributed rate-limiting architecture spanning 5 global cloud regions.”
“...I'd probably use Redis for that...”
Named the tool without explaining why. At scale, Redis replication lag under write contention invalidates simple TTL-based limiting.
→ State the failure mode first, then justify the choice.
“The first question I'd ask is what's our SLO...”
Opened by clarifying requirements — correct system design instinct under time pressure.
In your next attempt, lead with the failure mode before the solution. 15-second cold open naming the constraint, then build the answer up.
Start free. Upgrade when you're ready to drill harder.
The free tier includes a full evaluation every session. No features locked behind a trial.
No expiry. No card required.
Flexible month-to-month access. Cancel anytime.
One prompt. Sixty seconds.
See where you stand.
No setup. Sign in with Google to track your progress, or try a session first.
Start practicing — it's free1 free session per day · no credit card