Most Important Developer Interview Questions (Must Know)

If you’re preparing for a developer interview, these questions are asked very frequently in real interviews. Make sure you understand them clearly, not just memorize the answers. 1. What is the difference between Frontend and Backend Development? Explain responsibilities, technologies used, and how both communicate. 2. What is REST API and how does it work? You should know: HTTP methods (GET, POST, PUT, DELETE) Status codes API architecture basics 3. What is the difference between SQL and NoSQL databases? 4. What is Object-Oriented Programming (OOP)? Explain: Encapsulation Inheritance Polymorphism Abstraction 5. What is State in React and how is it different from Props? 6. What is Git and why is version control important? 7. What is the difference between Monolithic and Microservices Architecture? 8. What is Dependency Injection? 9. What happens when you type a URL in the browser? 10. What are Common Performance Optimization Techniques in web applications? 💡 If you want to practice mor