Your job happiness is going to depend largely on customer happiness and your relationship with that customer. If you are fortunate enough to have a US customer, your hours can be reasonable, but if not, good luck. There's a weird culture that emphasizes putting in hours, regardless of output. Coupled to the fact that many people are dependent on this job for their visas, the work culture can be unpleasant. In my time there, there were so many discussions of improving WLB through smarter experiments, automation, etc. I never saw any of this come to fruition, and as we all know, talk is cheap.
Get some experience working with high tech equipment and if you aren't promoted in a year or 2, look elsewhere, ideally away from the OEM industry, because this isn't going to get easier. I saw people there for years who worked 12h per day and still didn't get promoted. Fortunately in the early stages of your career, a lot of these skills are translatable within the Bay Area.
