EPAM Systems Senior Developer interview questions

This was for React.js opening. First round was a test based JS and React.js. Second round 1st technical round. Third round 2nd technical round. Forth round 3rd technical round (With project architect). Fifth round Hiring Manager round.

They found me on LinkedIn, we scheduled a meeting and I had my first interview with an HR girl, she explained the process, benefits and they asked me some questions to get to know more about my professional experience, a week later I had my technical interview, they asked me about my overall experience with Python, Frameworks, Infrastructure on AWS, and some other questions about my experience, I also had to solve an easy algorithm, then, after 2 weeks, another tech interview with one of their clients, they only asked me about my overall experience, and explained to me the project they were working on, I also had to solve another easy algorithm(counting occurrences within a dict), they asked me about some of the technologies they used with the project, I didn't have experience working with some of them but I knew some alternatives, apparently they liked me but they went for another candidate, they put me on the waiting list for other projects, I was on their waiting list for about 3 months and they kept on telling me that there were no open positions yet and they would keep their eyes open, the communications are slow with this company.