More focus on core concepts in javascript, and cover each & every fundamentals of Node.js, Express.js, React.js, MongoDB If your basics are super clear with technical answers you are good to go There are 4 rounds - 1. Aptitude round 2. Technical interview (more focus on core js fundamentals & MERN concepts) 3. Technical interview (Slightly challenging real world based practical ques, more focus is on optimized approaches & scalability) 4. Managerial round (Discussion on salary, work culture, future responsibilities & growth