Now launching โ€” interactive system design practice

Master Systems Through Hands-On Practice

Whether you are preparing for your first system design round or leveling up to senior, practice with interactive simulations, structured steps, and AI feedback.

From your first HLD to staff-level tradeoffs โ€” practice at your level

8 free starter problems47 simulationsAI step-by-step practiceFree canvas
Launching today โ€” try it free, feedback welcome

Simulation is the New Learning

Don't just read about distributed systems. Break them. Fix them. Optimize them. Our interactive widgets let you experience the trade-offs firsthand.

โšก๏ธ Handle the thundering herd

Simulate millions of users competing for limited inventory. Learn race conditions, locking strategies, and queueing.

Flash Sale System
Simulate 150 users fighting for 100 items. Toggle Locking to prevent overselling.
100
Stock Left

Virtual Queue

0 Waiting

Sales Processed

0 Sold
0/100 Sold

๐Ÿ”’ Secure by Design

Visualize encryption, key management, and secure storage implementation details.

Secret Vault

Centralized secret storage. No hardcoded creds.

LOCKED
My Application
Secrets are never stored in code. Apps authenticate (e.g., via IAM) and request a short-lived lease for the secret.

๐Ÿ”Œ API First Engineering

Master GraphQL and REST patterns. Understand schemas, resolvers, and over-fetching issues visually.

  • Interactive Schema Explorer
  • Query Builder
  • Real-time Response Validation

GraphQL Playground

Ask for exactly what you need. No over-fetching.

query GetUser {
user(id: "1") {
}
}
Construct query and press Run
Notice how the server returns only the requested fields. This solves the "Over-fetching" problem common in REST.

Same rough answer. A coach that fits you.

Watch how Adaptive Coach judges the same Requirements draft for Fresher, SDE-1, and Senior โ€” then moves you forward instead of trapping you.

TinyURL ยท Requirements

Demo ยท Adaptive Coach

Start practicing

Switch levels above to see how the ending changes.

Coming soon

Meet your AI Interviewer

The pressure of a real system design round โ€” without the real stakes.

Timed Mock Interview

A strict countdown, no hints โ€” then an AI hiring-committee debrief scores every phase.

Voice Interview

Answer out loud. The AI interviewer listens, follows up, and keeps you talking.

Defend your design

Passed a step? An AI skeptic challenges your design with real follow-up questions.

Be first in line when it launches. No spam.

Ready to Design?

Your journey to mastering distributed systems starts with a single component. Browse the problem set or launch the free canvas.