They had a very long interview process.
1. A test of 1 hours which contains 20 general aptitude questions, 20 technical level-1 questions, 20 technical level-2 questions and 10 technical level-3 questions (The technical questions were pretty much easy but the aptitude part was tough).
2. Then a technical round 1 F2F interview
3. Then a technical round 2 F2F interview
4. Then a technical round 3 F2F interview
5. Then a HR round.
6. Then a round with the CO of the company.
They asked me about OOPS, Algorithms, Databases, Data Structures.