I applied through a recruiter. The process took 2 weeks.

I interviewed in 2 stages, both technical. The first was a lighter question at my uni (they were doing a recruitment event), and the second was in a different city. I mentioned that I had to go by plane because it was far from me, and they paid for both the plane and the accommodations. The first round was standard, just the technical question, and I got asked to rank my interests. On the second round, there were 4 sessions with 4 different interviewers.

• First session: Asked a behavioral question and a tech question.
• Second session: Asked a tech question and a design question.
• Third session: Asked two tech questions.
• Fourth session: Asked only one tech question, but I think I was meant to go back and forth more as I got a "if you had asked me I would not have allowed X, but I love that you did it" (I think I added some error checking that was not necessary, it was a long time ago).

How do you check that a number is a palindrome without converting it to a string?