Want to thank leet code for my success in FB. Questions asked were similar to following ones
2 questions per round of 45 mins, so speed matters!
Phone round:
https://leetcode.com/problems/minimum-remove-to-make-valid-parentheses/
https://leetcode.com/problems/plus-one/
Virtual Onsite
https://leetcode.com/problems/product-of-array-except-self
https://leetcode.com/problems/find-all-anagrams-in-a-string/
https://leetcode.com/problems/minimum-window-substring/
https://leetcode.com/problems/group-shifted-strings/
https://leetcode.com/problems/task-scheduler/
System Design
Not any fancy one like design Twitter or Uber. More on scheduling service side and i designed using SQL appraoch. Discussed concuurency issues, Table schemas, composite keys etc.