Front-End Interview Preparation Bootcamp | Day 4 | Frontend Sample Interview Questions Continued

Welcome to Session 4 of our Front-End Interview Preparation Bootcamp, where we continued working through real-world frontend interview scenarios focused on performance, scalability, reliability, and user experience. In this session, we covered practical approaches to solving common frontend engineering problems. Topics Covered: 1. Handling Multiple API Requests ✅ Executing independent API calls concurrently using `Promise.all` ✅ Avoiding unnecessary sequential `await` calls ✅ Identifying when multiple frontend API calls indicate a backend design problem ✅ Aggregated APIs / backend-for-frontend approach 2. Search Box Optimization ✅ Debouncing API requests ✅ Avoiding unnecessary requests on every keystroke ✅ Handling race conditions between API responses ✅ Using `AbortController` to cancel stale requests ✅ Preventing outdated search results from overwriting newer results 3. React Performance Debugging ✅ Using Chrome DevTools to identify slow or duplicate API requests ✅ Identifying large network responses ✅ Finding inefficient JavaScript algorithms ✅ Avoiding unnecessary `await` ✅ Reducing unnecessary React re-renders ✅ `useCallback`, `useMemo`, and `React.memo` 4. Rendering Large Datasets ✅ Handling tables with 100,000+ rows ✅ Server-side pagination ✅ Virtualization ✅ Avoiding unnecessary DOM rendering ✅ Why array indexes should generally not be used as React keys 5. Large File Uploads ✅ Chunked file uploads ✅ Splitting large files into smaller chunks ✅ Concurrent uploads ✅ Upload progress tracking ✅ Retrying failed chunks 6. Offline-First Applications ✅ Designing applications that work without an internet connection ✅ Using *IndexedDB* for persistent client-side storage ✅ Synchronizing changes when connectivity is restored ✅ Handling data conflicts using timestamps or user intervention 7. Preventing Duplicate Submissions ✅ Disabling buttons during loading states ✅ Throttling critical actions ✅ Preventing duplicate submissions for actions such as payments 8. SEO for React Applications ✅ Server-Side Rendering (SSR) ✅ Static generation ✅ Providing search engines with fully rendered HTML ✅ Sitemap generation and indexing The focus of this session was not just on knowing individual concepts, but on understanding why a particular approach should be used, what problems it solves, and the trade-offs involved. More real-world frontend interview scenarios will be covered in the upcoming sessions. Subscribe to ‪@CodeKerdos‬ and follow the complete Front-End Interview Preparation Bootcamp series. #FrontendInterview #FrontendDevelopment #JavaScript #ReactJS #WebPerformance #SystemDesign #ReactPerformance #JavaScriptInterview #WebDevelopment #SSR #SEO #Microservices #InterviewPreparation #CodeKerdos