I applied through a recruiter.

There was a telephonic screening round where the HR himself took a managerial and technical interview almost. He spoke to me for an hour. Then there was a technical round, where we discussed the project in my previous company that we worked on. I thought the interview went really great and everything was fine. It was an hour. The expressions were really positive. But then after some follow-ups, the HR told me that the feedback was not positive, and they didn't give the reason why.

Internal architecture. What problem I faced and how I resolved it. Deep dive into several problems of the system. How the CI/CD worked in our cases. Why microservices? Why Git? How Agile works. What design we preferred. Why we chose the tech stacks.