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.

Phase 10 (Weeks 10–12) of the interview roadmap. Senior Track spans modules 1–19; the Staff Track starts at module 20.