Total 5 rounds.

First round (Telephonic) related to core Java (simple questions) just to shortlist you for F2F discussion.

Second round: Again, core Java in detail with some programming questions.

Third round: Data Structures (mostly questions on Trees and Queues).

Fourth round: JavaScript and whatever technologies you have mentioned in your resume.

Fifth round was with the director to check your real-time problem-solving skills.

Questions like:

• Explain deadlock with a program.
• Multi-threading programs.
• Implement a stack with a queue and vice-versa.
• Count nodes in a tree, etc.

Difference between an interface and abstraction.

Which collection to use and why (they will give you some scenario).

Difference between OOP and OBP.