1st call - Phone call with the Recruiter.

This was to discuss your experience and current interests. The purpose was to directly communicate and assess your fit for the company, determining if you were a good candidate to proceed with the interview process.

2nd call - Technical phone interview #1 using Collabedit. You were given two questions to solve in one hour.

• The first question involved finding the lowest common ancestor given two nodes.
• The second question was to determine if two strings are isomorphic (the exact question can be found on this site).

3rd call - Technical phone interview #2, also using Collabedit. You were given two questions to solve in one hour.

• The first question was to find the largest sum subsequence from a given array.
• The second question was a modification of the first, requiring you to find the largest product subsequence from the given array. You did not complete the code for the second question in time.

Side note: Recruiters were very easy to talk to and responded quickly.

Nothing really unexpected or difficult. If you put the time in to study for LinkedIn, you should be more than fine.