Databricks interview questions

Started with a phone screen with the recruiter, then had a phone interview with the hiring manager, they were able to accommodate a quick turnaround for an onsite since I had another offer. The onsite interview with 4+ team members about 3 hrs in length. They were able to give me a verbal offer by EOD.

I applied for software engineer - distributed data system Amsterdam. Did 3 rounds technical interview(one karat), one HM round. After completing 3 technical round, 1 Hiring Manager round. I received a mail from HR stating that we would like to conduct 1 more technical round of interview before proceeding to onsite. I was still okay with it although I think if you can't judge someone's coding skills from 3 rounds of technical interview, it's better to drop at this stage itself. Now, comes the interesting part, after 2 weeks of no scheduling, I reached out to HR and got an automated mail stating the "Databricks won't be moving ahead with the interview". I mailed the HR again for the feedback and his feedback was it's because of skills mismatch. Now, this is the real disgusting part. After spending 2 months of my energy and time preparing for Databricks, after 3 technical and 1 HM round, you say there is a skill mismatch? I never told anything new in the interviews which is not in my resume. It was a complete waste of my time and effort. The whole process took more than a month to schedule the interviews. The company that can't do a simple skill match job can't be better at other jobs!