It's not great that they didn't prepare you for this before coming on, but yes: as someone with 15 years of experience your job is not to get stuff done directl

It's not great that they didn't prepare you for this before coming on, but yes: as someone with 15 years of experience your job is not to get stuff done directly but to help your junior devs grow and compensate for their naivete. If you want to be building this directly you might want to consider startups or consulting, places where they need someone who both has real world experience and can build things? At a FAANG the reason they're willing to pay you so much is your leadership, mentorship, and teaching capacity: you plus a group of junior devs should be much more effective than the junior devs would have been without you.