Gilead Sciences has a reputation to conduct long stringent and difficult interviews. There are lot of interviewers and is usually an entire day event. Company is very professional and expects candidates to come well dressed in suit and be prepared to answer tough questions. Interviews at Gilead are well coordinated affairs. There is some thought put behind interview panel members. It could be inconsistent at time when it comes to the length of the interviews. Some teams have a much shorter affair, but u do see the end result. Those teams are not the high performing ones inside the Gilead and have higher turn overs.