I was contacted by FB recruiter via email.

Recruiter call:

• Asked questions on Big O for various Data Structures and algorithms.
• one code question - How to remove duplicates from a list

She immediately said I am through for the next round and asked me to pick a date.

Phone screen with FB Engineer: [45 min - coderpad]

• Small intro of the interviewer and he asked me to go through my resume.
• https://leetcode.com/problems/maximum-subarray
• https://leetcode.com/problems/valid-parentheses
  Big O for both questions

Got feedback in a couple of days and was invited onsite for interview

Onsite:

Round 1: [Coding]

• https://leetcode.com/problems/move-zeroes
  • was asked to return the count of zeroes after moving 0's to the end
  • was asked to write down the steps after every iteration
• Calculate tax if Salary and Tax Brackets are given as list in the form
  [ [10000, 0.3],[20000, 0.2], [30000, 0.1], [null, .1]]
  null being rest of the salary
  Big O for both questions

Round 2: [Coding]

• https://leetcode.com/problems/palindrome-permutation
• Input char array consistes of 'W' and 'H' for week day and holiday respectively, and an
  int n. We can change 'W' to 'H' n times and return the longest continoust subarray consisting 'H'
  Variant of https://leetcode.com/problems/max-consecutive-ones-iii

Lunch:

• Half an hour break with an Engineer.

Round 3: [System Design]

• There are music providers like spotify, apple music etc. Design a service for these providers to display top 10 songs played by each user. Was aked to write ER tables and API's.

Round 4:

• Normal behavior questions
• Given a BST and two values p, q -> return an int which is sum of all the values between p and q inclusively
  https://leetcode.com/problems/range-sum-of-bst

Round 5: [Manager]

• Talked about previous experience and challenges.

Every intervier introducded themselves in the beginning and asked me about previous exp etc
Gave me a chance to ask questions at the end.
Eveyone was friendly and I had positive experience