I was already an intern at the time, and so my "interview" was mostly the month I worked. I got my internship through a referral from a friend in the same department. My actual "interview" was more a formality to ensure I wished to stay on with the company. By that point my work had spoken for itself. In my experience, Leo hires many interns directly - the ones that seem passionate and really try to tackle creative briefs and can work well with the existing teams will generally be offered a position if one is available.