There are times where a big company needs to build something new (albeit within a constrained ecosystem and a very narrow swimming lane).
To do so, one good way is to hire the experts of that domain that have built it before. That can mean acquiring a small specialized company, or simply hiring its top talent.
You could also repurpose your existing staff, but a big company is unlikely to have a lot of "builders", as most of its staff is just iterating and maintaining things others have built a decade ago. You probably still want to have some of those people in the team anyway, for integration purposes.
To do so, one good way is to hire the experts of that domain that have built it before. That can mean acquiring a small specialized company, or simply hiring its top talent.
You could also repurpose your existing staff, but a big company is unlikely to have a lot of "builders", as most of its staff is just iterating and maintaining things others have built a decade ago. You probably still want to have some of those people in the team anyway, for integration purposes.