It's entirely standard at tech companies to have a non-solicitation clause in employment contracts that prohibits soliciting other employees up through a fixed

It's entirely standard at tech companies to have a non-solicitation clause in employment contracts that prohibits soliciting other employees up through a fixed period (e.g., one year) after you leave. IANAL but I did some research on this and to the best of my understanding these are perfectly legal and enforceable in California.