Docusign Software Developer interview questions

1st round: Recruiter call (30 mins) 2nd round: Hackerrank, 3 questions, time was VERY less compared to the questions. 3rd round: 4 hour long interviews. 1st interview was with the Product manager and a QA engineer. 2nd and 3rd were with 2 engineers, 4th was with Director of Engineering. Lot of behavioural and technical questions. One technical interview had a specific questions whereas the other tech interview started with specific question and once I was done with it the interviewer randomly asked me questions about various concepts. I received a reject email the next day. The process was super quick. I liked talking to everyone, recruiter, tech team, Director, etc. The only thing I didn't like was I wasn't given a feedback. After investing so many hours and so much time, feedback would have been really helpful. Also, I thought that my interviews went great but guess not.