Agency contacted me via phone with no initial interview required. I was later interviewed on site. Interview was extremely quick and fast. Very general questions, past experience, past project experience. They always ask about specific skills such as pivot tables and v-lookups in excel BUT I never had to do any kind of reporting using excel. I was transferred between 2 positions, and I cannot emphasize this enough, I never pivot any tables or used v-lookups or submitted any reports via excel. Don't let this question scare you if you lack hands experience with excel.