I applied through their careers site and was contacted by a recruiter initially. The recruiter had a laundry list of questions for the preliminary screen:

1. On which port HTTP runs?
2. Time complexity for searching an item in a HashMap.
3. Time complexity for searching an item in a BST.
4. SSL full form?
5. Maximum value of a 32-bit unsigned int?
6. Complexity of adding an element to the head of a linked list?
7. Protocol underneath HTTP?
8. Time complexity for searching an item in a sorted array.

I answered all of them, and after that, I was set up for a Skype interview with one of the developers.

Second Round:

During the Skype interview, I was asked a bunch of questions related to technology, and then there was a problem-solving coding exercise.

1. What happens when you type yelp.com in your browser?
2. Let's say your yelp.com homepage is loading slowly; how would you start addressing the problem?
3. Inner join vs. left outer join.

I pretty much answered all of them, then there was a problem-solving question.

Write a function that determines if a given string is a palindrome.

bool isPalindrome(string input);

I was able to complete the problem, and even the interviewer seemed satisfied with the solution.

Test Cases:

• "racecar" => true
• "!!a!" => true
• "abc" => false
• "a" => true
• "A Man, A Plan, A Canal – Panama!" => true