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I interviewed for a Software Engineer position at Oracle. The interview process consisted of six rounds.

Round 1 (Problem Solving):

1. Minimum Add to Make Parentheses Valid (Leetcode)
2. Minimum appends required to make a string palindrome.
3. Longest sub-array having sum K.

After Round 1, I received a call from HR saying that I would be having another five rounds.

Round 2 (Problem Solving + Design):

1. Generate all the permutations of a String (Leetcode)
2. System Design tiny URL.
3. How DNS works.

Round 3 (Bartender):

1. Discussion about current work.
2. Questions related to microservice architecture.
3. Many behavioral questions (what are your competencies, biggest achievement, any conflict with team mates/manager etc).

Round 4 (Problem Solving):

1. Internal implementation of HashMap, diff between hashMap and TreeMap, how you can use any custom object as a key.
2. You have unlimited number of eggs and n floors. Find the number of trials needed to find a floor at which the egg won't break.
3. Bulb Switcher (Leetcode)
4. Odd even link list (Leetcode)

Round 5 (Technical):

1. Discussion about one of my previous projects.
2. Concurrency questions, diff between calling run() and start(), synchronized keyword, how can you implement threadpool.
3. How to make your system highly available.
4. Write a program to print all the palindromes in a given String.

Round 6 (Hiring Manager):

1. Discussion about my current work and responsibilities.
2. Behavioral questions (biggest technical challenge in recent times, why you want to leave current company, Why Oracle etc.)
3. Details about the team, work and the role.