Before arranging an interview call, they email an SQL and bash test link. Here is a website you can use to prepare: Hacker Rank. The test is average but you have 40 mins to complete it.

There were 4 rounds. First was the assessment, then technical in which resume based questions were there and also some on oops and sql. Then an HR interview which had technical questions as well. Then finally another HR round. Interviewers were all polite and encouraging which helped me to speak more confidently.