Round 1: Basic Knowledge and Fundamentals Topics Covered: Node.js: Event loop, asynchronous programming, handling callbacks, promises, and async/await. MongoDB: CRUD operations, schema design, and aggregation framework basics. JavaScript: ES6+ features like destructuring, arrow functions, and template literals. Example Questions: How does the Node.js event loop work? Explain the difference between findOne() and find() in MongoDB. Write a function in JavaScript to reverse a string. Round 2: Hands-on Coding and Application Topics Covered: Similar to the first round but more practical. Node.js: Implementing an API endpoint, middleware, or basic error handling. MongoDB: Writing queries using operators like $match, $group, or $lookup. JavaScript: Solving small coding challenges, debugging, or optimizing code. Example Questions: Write a Node.js API to fetch user details from a MongoDB collection. Given a MongoDB query, explain its output and optimize if needed. Write a JavaScript function to check if a string is a palindrome. Similarity Between Rounds: Both rounds assess understanding of the core technologies. The focus is on demonstrating practical skills with real-world coding examples. Questions remain within the basics and fundamentals to evaluate problem-solving capabilities. Tips for Preparation: Brush up on JavaScript fundamentals and Node.js-specific concepts. Practice writing MongoDB queries and understanding its aggregation pipeline. Review how to handle asynchronous operations effectively in Node.js.