The roadmap it is good, but more important is the presence of a clearly compiled technical document, specification of the idea in numbers and professionals in the team
Each project should have a marketer who clearly understands all of its actions in the future, so that the project develops on the market
In general, you need to conduct an interview before recruiting people in a team, then you can think about future plans
I have not seen news that the team needs new specialists. Now there is a stage of technical preparation, and this takes time. As soon as everything is technically ready, the project will launch an advertising company.