After going through the online application process, I was given an online test. It was numerical and not difficult. The good thing was that I could see my results immediately after submission.

The next stage was an in-person interview. The first hour was with two people, and the second hour was with a senior developer. Both hours were very similar: technical and tough. It was a mix of usual brain-teaser questions, simple coding, and basic knowledge of server applications.

As I understand, an interview can take a maximum of three hours. The last hour is supposed to be with HR, but I didn't reach that stage.

The whole process was really long and took around four months.

To make a math model which represents the number of ways we can go down from stairs.