Bocada interview questions

This is a small company, with mixed roles (support Eng. hiring). Three rounds one hour each. All of them within five working days since it was an urgent position. I did adjust to their schedule and completed their weird questions, i.e., conversion from decimal to hexadecimal. I did requested feedback just three days later; Using LinkedIn (no formal response) they informed me that they would not offer me the job. I had to ask again for feedback, and they told me my experience is good, but they decided not to offer me because of my lack of experience of the Bocada software (which is an internal development). This is how I lost hours of my time in a hiring process for a company that does not value candidate’s time and they are not professionals. I am happy I discovered this during the hiring process and not by collaborating with them.

I applied on Linkedin. After some days the CEO came to me asking some questions and then a technical interview was scheduled with a Software Engineer. Here was a mix of Q&A interview (with simple questions) and a live coding interview (for SQL and C#). After that they scheduled more 3 interviews "in parallel": 1 with the Team Leader, 1 with the CEO and 1 with the PO. The Team Leader asked me a lot of SQL Server questions and Data Structured questions. The CEO is all about cultural fit. The PO is about how you work. After that I received an automatic e-mail from Linkedin informing me that I was not approved in the process. But here is the question: Why? Was it about technical issues? Was it about cultural fit? What was the point? I spent 4 hours of life on this and I do not have the ideia why I was not approved.