1. Recruiter Call

2. HackerEarth: Easy questions, coding, and multiple-choice questions.

3. Second Round: Virtual Round (on PC).

4. Third Round: Asked to come to the office.

5. First Round: Director round.

1. There is a HackerRank test for 60 minutes. The link is provided by the time of the 1st round, a live screen share with the HR taking a screenshot for government ID proof. The test has 8 questions: 5 are MCQs, 2 are coding, and 1 is an SQL query.

2. Flatten Array: https://stackoverflow.com/questions/31851548/flatten-nested-arrays-in-java

3. Given [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] and K=3, the output should be: [1, 2, 3] [4, 5, 6] [7, 8, 9] [10]

Third Round:

1. Convert a string from snake_case to camelCase and vice versa.
2. Can we keep a class as a key in a HashMap?
3. If yes, what needs to be done? (Change the class to immutable).
4. Please read overriding equals and hashCode methods thoroughly.
5. Design a file system and search for a file.

Final Round (Director Round):

1. Design a message reading mechanism. Messages can pass from publisher to subscriber in any order, but we need to read them in a particular sequence only.

2. Given a digital time, for example, 12:30, write a program to return whether the angle between the minute hand and hour hand is acute (<90 degrees) or obtuse (>90 degrees), if you imagine it on an analog watch.

3. Given a small code snippet, what is the output?

4. What challenges did you face?