Workflow

Set up DB instance on AWS.

Set all security restrictions for DB.

Migrate DB tables and data (if necessary) to a new instance.

Set up BE and FE instances on AWS.

Set up all security limitations for new EC2 instances.

Install all necessary soft on a new instance.

Set up CI/CD.

Set up S3 bucket on AWS.

Set up all necessary security limits on new bucket.

Regularly check the issue board for new issues.

Regularly check all instances stats to be sure everything is working ok and is not overloaded.

Upgrade (or downgrade) an instance if necessary.

Be sure that instances have enough free space.

Give team members necessary accesses that they need for current work, tests.

Check what accesses are not used any more, revoke them.