It was advance technical round. The topics given to me were system design, Nodejs promise async/await, past experience, projects. Interviewer asked questions based on system design and architecture based on my previous experience, how to scale and system how to add additional features to existing system, how to protect system in an event of DDOS, how to identify and remove fake-email. Overall Interview was quite interesting question related to DSA was around which data structure would I use to store data that can be efficient to search and takes less space to store individual elements. Interview lasted around 45 minutes.