There were 4 rounds: 1st round: Video round of HR questions. Pretty much everything is covered on Glassdoor. 2nd round: HackerRank coding challenge. There are various sections. Maths is compulsory and out of the remaining 5 sections, we need to complete 2 sections (2 languages). 3rd round: Telephonic round. Topics are software design, maths, and basic questions on any 2 programming languages of your choice. 4th round: Onsite interview. Here you'll have 4 rounds. Everything is well organized. First is technical round (2 hours). Second interview is with the hiring manager (1 hour). Third is lunch interview (1 hour) and fourth is HR interview (1 hour). The overall process took 2 months.

I got a mail for background verification and got rejected after that. The reject had nothing to do with background check though. It was really disheartening!

Dijkstra's algorithm.