I applied through a recruiter. The process took 1 day. I interviewed at Ola (Bengaluru) in Oct 2018
Interview
I got contacted by HR. Initial screening round was hackerrank test, 2 questions. I could solve both of them.
Second round was on DS ans algo, Operating system concept. It went well.
Third round was on problem solving and android fundamentals.
Fourth round was with hiring manager.