It’s ultimately your builder’s responsibility to make sure that they have the right subcontractors and manpower on-site at the right times. Allow them the freedom and flexibility to coordinate people and building materials. While outside sources like an independent architect or engineer can play important roles as experts who look after your best interests, it’s important that your builder run the project as they see fit on a day-to-day basis.
If you or another manager steps in too frequently, expect communication issues. This is when things go wrong. Choose a builder who’s professional and then let them do their job.