I failed in the first round but they had string/array questions which required RegExp to solve, such as polynomial multiplication expansion. 3 questions were difficult and 3 were easy such as find time in hours if given minutes. There were 5 open ended questions.

1. What is Node.js and how it works and how can we handle a CPU intensive task. 2. What is express.js why we need this. 3. Write 4 api endpoints for handeling CRUD operation 4. What is JWT why its better than cookie. 5. What is SQL injection 6. When to choose sql vs nosql database. and few more standard backend questions...