I applied through Facebook's website. It took three weeks until they contacted me for the first time.

The first interview was with HR over the phone. The second interview was also on the phone, but this time I needed to answer two technical questions.

On the second interview, I needed to answer the questions by writing code on a platform they provided via a web link. The questions were fair, but I didn't pass because I used the wrong method name for the data structure. Both interviewers were nice.

Given two strings that represent binary numbers, return as a string the sum of them.