If you don't like hard work or working hard, this place will chew you up and spit you out. So will living in Los Angeles if you aren't used to living in a major city.
If you are looking for a nice koosh job where you can figure out the game in the first 6-12 months and then kick back and coast... You are in for a rude awakening and a short lived experience here at SpaceX.
Living in LA is extremely expensive and it is hard for companies to pay you enough to live comfortably. Even more so, most people working here commute a fair amount of time in traffic. This can be a major cost to employees who are unaware, or the lost time and money when traveling for extended durations regularly. Do NOT get a job here, move to LA, and expect buy a house here very easily... I think the house I used to own in another state is 4x more expensive than here, and we sure don't pay 4x more here!
LA is not a great city for families, starting a family or getting a nice big home with a yard and a couple pets. Its noisy, its expensive, it's hard to get places in a decent amount of time. So with your small house, crap yard, and restricted mobility, people tend to move here and stay for only about 2-3 years and then they have had enough and leave. Not really because of the company, their job or their performance. Especially when you work your butt off all the time and only get 15 days of paid vacation per year.
I hope you don't think too much about overtime or working when you weren't expecting too. Because, SpaceX is in no shortage of asking this of pretty much everyone. Not to mention, whatever you are doing is probably demanding of that level of dedication too. Overtime is normal time, especially for salary/exempt employees.
SpaceX does not incentivize mediocre behavior... if you expect extra compensation, you better be among the best of your peers, or no one is going to notice your endeavors. We don't even really equate your bonuses or raises to your contributions directly. More or less, we just compare you to everyone else here, and then say "we have this much money for raises, split it up according to how people compare". Do not go saving $1M expecting to see some set percentage come back to you.
It is very hard to get your resume past the first hurdle or two... There are just so many people applying that if you aren't exactly what we are looking for, you probably won't even be looked at. That means, make certain you are submitting a resume and cover letter that clearly shows you are a good fit for the position.
SpaceX is in a time of transition, we are growing and we aren't the little kid on the cul de sac, anymore. It can be tough for people to transition and there isn't always a lot of guidance for people who are used to the larger organizations with guidelines and constant procedural feedback. We expect you to be a self-starter in a lot of ways and tend to throw you into the deep-end to see how well you can swim, before loading up your plate with the important stuff. It tends to be a prove-it/earn-it sort of relationship.
Success is hard here, we dont give a lot of feedback unless we have to, especially management. When you start climbing the ladder, there is less and less help and guidance. You must be a self-starter and capable of guiding yourself and learning on your own.