Received email to schedule phone interview. Scheduled the phone call for the same week. Phone call took about 20 minutes going through resume and answering basic coding concept questions. Got invite for on-site interview 2 weeks later. On-site interview is around 4 hours long starting with explanation of position and then the rest are technical questions. Interviews are 1 on 1, 30 minutes each and targets a different skill.

Phone interview: Explain inheritance.

On-site: Give expected output given C++ code that uses polymorphism. Find the errors and inefficiencies given C++ code.
Discuss the advantages and disadvantages of different data structures.
Rewrite C code to take advantage of OOP. Explain how you would test for correctness given a goal problem and the code.