At Black Gibbon we have a very unique business model:
For a pre-seed, seed startup speed to market is everything. The main gripe with remote is it is better at an early stage to be collocated. But they are other factors that must be seriously considered:
On the the flip side, being a part time tech PM gives the FAAANG engineer first hand exposure into the chaotic startup world as well. He himself will also learn a lot. And who knows, he may even quit and join your company :)