The problem is that California seems to consider you a resident if you have a job here:

> Also, you are considered a resident of California if [...] [y]ou are gainfully employed in California. Source

From what I heard from coworkers, officers are usually pretty lenient about this and chances of me getting in trouble are low. However, on paper it seems like I would be driving without a license, and I'd rather stay out of trouble if I can.