Pros
Pretty good salary, stock incentives, great products and pipeline. Beautiful campus. Intelligent workforce. Lots of new employees coming from other companies bring in new ideas.
Cons
There's quite a few. First, Gilead runs so lean that its tough to keep your head above water. They have a term called "Responsibly Lean", which to senior management must mean "Let's stretch everyone so thin they don't have time to think about how bad this is." Terrible work-life balance and extremely inflexible to new ideas such as compensatory time after traveling or telecommuting. Very hard to get promoted. Very political senior management. Terrible at acknowledging a job well done - in 3 years I've been told "good job" once. Management unresponsive to change. Over half the company has been here for less than 3 years, most likely due to high levels of burnout.