Pearl Certification interview questions

I had 4 interviews, one with HR, one with the team I would have potentially managed, and one with each of the 2 company founders. A lot of time and preparation went into understanding the company, presenting my skills, and answering questions about how I would undertake the role. A couple of weeks went by with no response so I reached out, and was told they still hadn't made a decision. Additional months went by and ultimately I was never contacted to say I wasn't selected for the role. This seems to be a failure of HR, and given the time invested I expected a bit more of a courteous response just letting me know another candidate was selected. I cannot speak to the work atmosphere since I wasn't hired, only the interview process.

Initial video interview was on Google Meet / Zoom with HR. This was followed up with a coding challenge before moving on to speak with the hiring manager & technical team to go over the solution.