1. A programming test via email, hosted by the interviewer's website, with all kinds of tricky programming problems.

2. A phone interview about your background and experiences. This one was nice.

3. An on-site interview. It will likely start with a lunch with the interviewers, followed by meetings with 3 to 4 people, one at a time, for 30-45 minutes each.

How do you ensure an executable file downloaded by users will not be changed?

(Answer: Add a digital signature.)

How do you add the signature?

(Answer: Use a hash function to generate a hash code.)

How do you add this hash code to the executable?

(Answer: Use a magic number in binary data and preserve a fixed-size space.)