So, most of the big companies have offices in LA (FAANG, unicorns/decacorns) but- they're often in a really hard to get to place that is insanely overpriced.
Google is in Playa Vist and Venice, Amazon has a big office in Santa Monica, SNAP is on the west side of LA, etc. A SFH in any of those cities is 4M or more, and the more popular places for families to live is easily an hour and twenty minutes away (burbank, pasadena, the valley).
Orange County has fewer big tech companies but they do have a larger Google and Amazon office (~1k each I belive?), but the cost of living is quite a bit lower.
Less options though if the job situation changes.