Among the many ways you can hire others to build a mobile app for you are:
Hiring an in-house team
Outsourcing your app development projects
Forming your own team in-house could be more expensive than outsourcing. After all, if you hire an in-house team, you must pay them even when you don’t have an active app development project. But despite the additional expense in terms of regular salaries, benefits, etc., having a team nearby maximizes the quality of your app.