F5 Software Engineer interview questions

I was interviewing with F5 networks, I applied online and received a call from the recruiter. After speaking with the recruiter I was scheduled for the phone interview where I was asked one coding question. I did solve the question and gave the solution for that particular problem asked to me. After a few days the recruiter contacted me and told that I had cleared the interview and would like to invite me for the On-Site interview. I gave my availability for the onsite for the Wednesday and Friday for the week after but I didn't hear anything till Tuesday so I reached out the recruiter to check if there was any update. That was when I got to know that the one of the manager is on a leave for a couple of weeks who also wants to interview me so they are not giving me a confirmation about the schedule. I waited for couple weeks and then was constantly trying to contact the recruiter but I didn't get any response and all of sudden after 3 weeks I get to know that they are not moving forward with me because they found an internal candidate with whom they are moving forward with. This was the worst interview process that I have experienced till date. Even after going through the glassdoor reviews which are on the same lines I was expecting mine to be a bit different but it turned out that way. I am really very disappointed with this behaviour which is not at all professional. I wish I could give very Negative experience.

Started with Hackerrank test with mix of objective type questions and couple of programming questions. After hackerrank test, they made candiates wait for 4 hours to start interviewing for next round. Unprofessional and adhoc approach by HR. Interviewer didn't seem to be interested to take interview, probably he was tired. So wanted to finish off quickly without even trying to understand the candidate's background. Interviewer had already decided not to consider my profile, he seemed uninterested and wanted to wrap up interview quickly.