RATP Dev Engineer interview questions

The interview process is long. I applied several years before they called me for a different Position that is not relevant to my experience, I arrived at the premises on time, but the hiring manager was unavailable, and I had to wait for four hours for my interview. HR did not send me any information about the job responsibilities or salary information before the interview. The hiring was in a hurry and didn't answer any of my questions and didn't provide any relevant information about the job responsibility or salary for the position he is hiring for.