You want to lure the TOP level tech specialist from another company.
Cool CTO, PO, UI / UX designers don't grow on trees, on the contrary, they've been working remotely in large companies and get salary in foreign currency. To build your product by a cool team of such professionals - you need to lure them. Successful recruiting agencies are agencies with well-established networking, which means that they have more ways to lure top tech specialists than the in-house HR-department.