First inteview by HR took about 30mins, 2nd interview with Hiring manager took about 45mins. No update after the last interview, until after 1 month I received an email about job offer.

There is an assessment need to be finished before interview. Interview questions are asking about your previous work experiences and need to describe how you overcome a challenge. Try elaborate as much as you can when described on the work experiences. At the end of interview, they may give you a logic test to test your logical thinking, try to not nervous and calm down to solve it.