Our plan is to move our servers to a VPC. All the static files are already on S3 and the application is modified accordingly.
When you migrate to a VPC its fairly important to choose wisely which subnet plan you are using as it is difficult to change that later. And the subnets determine in which availability zone the servers are in.
The transition will be complicated and as we're running a high-availability site with 5 Mio Uniques we would like to help a consultant with our migration.Amazon "recommends" some "Solution Providers":
https://aws.amazon.com/solution-providers?selection=service_type_id&service_type_id=6&type=si
Have you worked with any of the companies or have tipps for good consultants in this area?
Has anyone made bad experiences using AWS VPCs?