Here’s how the process of interviewing generally goes: 

• Screening call / potentially on-site interview . Typically done by someone in HR. If done by someone technical, it’s normally quite short. 
• Technical interview. You’ll have another round of interviews with actual developers and they’ll dig into your knowledge. 
• For the most part, it’s a waste of everyone’s time and does not assess the right skills.
• The final interview, meeting the rest of the team. Sometimes this interview is replaced with meeting the founder if it’s a small company. 
• Offer. 

If you don’t care about the answer to a question, don’t ask it. If we’re having a nice chat, I probably don’t get to the ones at the end. If it’s a little painful and hard to talk to my interviewer, I might get to ask all of them.