The interview process involved several rounds:

• First round: Some online algorithm exercises.
• Second round: Filling in some information in a spreadsheet.
• Third round: I received an email with 1-2 days' notice that three interviews would take place in a span of 4-5 hours.

I mentioned that I would be unavailable at these times, since I also work at night. After that, I never heard back from them, even after sending another email asking if I was still in the process.

Normally, companies politely request some time availability from candidates before scheduling any one-on-one interviews. Not receiving a response to my emails was a big disappointment for me.

They contact you, inviting you to participate in a selection process, and then this is how they treat you.

No opportunity to be asked.