Top 75 Front-End & Back-End Developer Interview Questions with Answers (PDF)

Prepare for your next developer interview with this 11-page guide covering the questions asked most often for front-end and back-end roles. Each answer is short and written the way you would say it in an interview, with code examples where they help.

What's inside

HTML and CSS: box model, Flexbox vs Grid, specificity, responsive design

JavaScript: closures, hoisting, event loop, promises, async/await, this

React: Virtual DOM, hooks, props vs state, keys, memoization

Back-end and APIs: REST, HTTP methods and status codes, middleware, CORS

Databases: SQL vs NoSQL, ACID, joins, indexes, normalization, common SQL queries

Security: JWT, sessions, SQL injection, XSS, CSRF, OAuth

Architecture: caching, load balancing, microservices, URL shortener design

Behavioural questions, coding-round tips and a list of the most repeated topics

Good for students, freshers and anyone switching to a developer role.