technical

System Design interview practice

Work through realistic system-design rounds — from URL shorteners to feed ranking — with follow-ups that probe consistency, throughput, failure modes, and cost.

Start a System Design mock interview All topics

Sample questions

What a System Design round actually looks like.

These are the kinds of questions you'll drill. Real mock rounds will generate many more — tailored to the exact JD you paste in.

Design a URL shortener that handles 10k writes/sec and 100k reads/sec.

How would you build a notification system that guarantees at-least-once delivery?

Walk me through your approach to a design question you've never seen before.

What trade-offs would you make between strong and eventual consistency here?

Why practice System Design with a mock round?

Reading System Design questions isn't the same as answering them live. You need the rep — the pause, the clarifying question, the moment where you realize you forgot the framework. We put you in that exact spot, then show you what a strong answer would have looked like.

Questions grounded in your actual JD
Voice or text — practice your delivery
Model answer + specific gaps after every question
Follow-ups that drill into your weakest answers
Pause and resume anytime

Keep drilling.

React

Hooks, rendering, and real-world patterns.

SQL

Joins, indexes, and query plans.

Data Structures & Algorithms

Arrays, graphs, trees, and the classics.

Behavioural

STAR answers that actually land.

Leadership

Influence without authority, grown-up feedback.

JavaScript

The language, not just the framework.

Ready for your System Design round?

Paste the JD, pick your topics, and go. Full session, full feedback, no fluff.

Start now