Frontend System Design

Frontend System Design is about architecture — not just building UI. SDE-2 interviews ask you to design autocomplete, news feeds, chat apps, and explain trade-offs across performance, scalability, and accessibility.

This module covers the RADIO framework (Requirements, Architecture, Data, Interface, Optimizations), question types, rendering and caching patterns, WCAG accessibility, i18n, security, and the quick-fire answers interviewers expect.

You will practice structuring answers for autocomplete, infinite scroll feeds, real-time chat, and e-commerce flows — with explicit trade-off discussions for scalability, offline support, and API design.

The RADIO framework gives interview answers a clear shape: clarify requirements first, sketch architecture, define data models, specify API contracts, then layer optimizations for performance, accessibility, i18n, and security.