The first call was a screening with the recruiter. A quick quiz of about 20-30 general questions determines if they will schedule interview calls.

The first interview was on Skype and was scheduled for 45 minutes. The second and third interviews were scheduled back-to-back, both 45 minutes and on Skype.

In all interviews, you first go through fairly general questions:

• How would you solve this (filter spam reviews)?
• What's the complexity of that (operations in binary trees)?
• Explain something (difference between processes and threads).

The next part is usually a coding test. They ask you to implement something. I remember reversing a linked list and finding the top 10 queries in a file.

How would you filter spam?