Informatica Senior Software Engineer interview questions

Round 1 : telephonic (Basic java with collections questions) F2f : 3 rounds : Each round had one coding exercise (Java File i/o, threads, remove duplicates in a list, print fibonocci series using recursion , binary tree traversal), one design exercise ( Design a logging utility, tiny URL service architecture), SQL Join queries,

I gave two written test than they called for two technical f2f rounds and HR round only if I clear first two technical rounds. As per them, I cleared two technical rounds and they asked me to wait in a meeting room for HR round. I waited for 10-15 minutes then they said "HR Manager is busy in meeting. We will call you". I wrote emails, called them and no response, completely unprofessional.