Rocket Software Systems Engineer interview questions

I was invited to FOUR separate interviews. First I met with the recruiter, then the following three interviews were with the VP of IT Infrastructure and the Senior Enterprise Architect. I felt these interviews went pretty well - each of them went over time by about 15 minutes because we were talking about technologies and ideologies. After four interviews I was pretty confident. I really liked the VP and the Sr Architect I met with - they were both smart and very personable. However, after three weeks of waiting after my last interview (they noted they had some other candidates to talk with), I reached out to the recruiter only to find out that they had placed the position “On Hold” and had never reached out to me to let me know. This was a huge waste of time for everyone involved. Extremely unprofessional to leave a candidate hanging until they reach out, especially after 4 separate interviews. If the job came off hold at this point (4 months later) I’d never take it.