Before being allowed to interview you have to submit a written test that consisted of writing a small program to solve a particular problem. Techniques and methods I demonstrated included Dependency Inversion, Separation of Responsibilities, Unit Testing and Mocking, Interface Segregation Principles and general awareness of programming design patterns. The standard for acceptance for interviews was high and out of 8 candidates I was the only one that made it through the first round. The actual interview included discussions around Agile practices as well as demonstrating in depth knowledge of SOLID programming principles. The second part of the interview consisted of extending and modifying the original program that was sent in. The idea was to demonstrate how you approach a problem and see whether your original program design could be easily changed and extended. Further in-depth technical questions were then asked to elicit opinions of ORM's vs Stored Procedures as well as determine my understanding of how mocking tools (in this case Moq) work (hint: they use a dynamic proxy). Although I didn't get the job, this was without doubt, one of the best and most thorough interview processes I've been through.