my solution to how to manage tfstate for a large team/distributed builds using s3 buckets and dynamoDB
FIRST: Deploy the s3 bucket and DynamoDB in setup-infra dir
SECOND: Uncomment the 'backend' block in your project main.tf
use terraform init again to initialize the project dir then all changes going forward should get stored in the s3 bucket and DynamoDB will ensure no one else can make changes while you're working on it.