Round 1 – (Pure Frontend fundamentals)
👉Explain how JavaScript execution context, async behavior, and event loop work.
👉Questions on closures, Promises, hoisting, string methods, and array methods.
👉Find top-k elements in an array and hash map problem (DSA).
👉Difference between arrow functions vs normal functions.
👉Promises and async logic questions.
👉 Build a React list with collapse/expand feature
👉 Create a reusable Button component with variants and sizes (like MUI)
👉 React class component lifecycle and hooks behavior
👉 Reconciliation, rendering, and why React behaves a certain way
👉 Reflow vs repaint in the browser and when they happen
👉 CSS animation performance: why transform is preferred
👉 Event propagation: bubbling vs capturing
👉 Write a Promise polyfill with real use cases
👉 Implement an async scheduler with max concurrency
👉 Big list rendering optimization (windowing / virtualization)
👉 Build React-like class components from scratch (ES5)
Round 2 – (HLD)
👉 Design a Pinterest-like grid UI system and discuss architecture and performance – how components break down, how data flows, and how you’d handle large datasets efficiently.
👉 Discuss the HLD of your current or past frontend system or project, covering modules, component hierarchy, API contracts, caching, performance, and how you handle non-functional requirements like response time and availability.
