I applied directly via Mercari careers site.
Following is the order of the whole process :
1) Hackerrank Test - Give 4 hours to complete it (2 Algo question and 2 pl/sql question)
2) Interview with software engineer - 1 hour
3) Interview with Engineering manager - 1 hour
If you make through this, you will be hired.
It takes a lot of time from their side to proceed with the next step after Hackerrank test or your github submission.
In the last round , the one taken by the engineering manager - He didnt really give enough time to answer the questions . He was rushing through the questions and finished it in 50 mins.