Virtusa Software Engineer (Backend) interview questions

The interview process consisted of 3 rounds: Online Coding Test (HackerRank): 2 DSA questions (medium-level) involving arrays and strings. 1 SQL query problem. 1 short MCQ section on JavaScript concepts. Technical Interview (Round 1): Focused on backend concepts, REST APIs, and database design. Questions I faced: Explain event loop in Node.js. How does JWT authentication work? Difference between SQL and NoSQL. Write a function to reverse a linked list. Also discussed my past project experience and optimizations I made. Technical + HR Interview (Round 2): System design question: “Design a basic video streaming platform.” Asked about scaling MongoDB, using caching (Redis), and API rate limiting. HR part was about relocation preference, salary expectations, and why I wanted to join.