technical
Frontend system design rounds at senior+ levels test how you architect large web apps — state, data fetching, perf, accessibility, and shipping safely across teams. Practice the modern questions FAANG and scale-ups ask.
Sample questions
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 Twitter's home feed — what trade-offs do you make for client vs server rendering?
Walk me through state architecture for a 200k-LOC web app with 12 squads.
Design a real-time collaboration document editor — what's your conflict-resolution strategy?
How would you instrument and debug a perf regression that only shows up on slow 3G?
Walk me through your approach to a11y at scale.
Reading Frontend 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.
Related topics
React
Hooks, rendering, and real-world patterns.
System Design
Scale, trade-offs, and clear reasoning.
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.
Paste the JD, pick your topics, and go. Full session, full feedback, no fluff.
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