Location: SF Bay
Willing to relocate: LA, San Diego, or Texas
Technologies: Brains, and various other less important tools
Résumé/CV: on request
I've encountered this kind of situation myself.
How common is this in big tech firms?
Is it common at the FAANGS?
If it were me, I would insist on equity, be it co-founder, first-employee or employee at worker-owned co-op. If the company profits and you helped it get there, so should you.