Hey Maria, serverless does not support VPC peering or connections like that at this time. You'd need to supply credentials to connect to your services directly, eg AWS_ACCESS_KEY_ID/ AWS_SECRET_ACCESS_KEY
Those creds can be set securely as environment variables, and then used by clients (eg boto3) to make a connection to your services over the public internet
If this architecture doesn't work for your infosec team, then Dagster Cloud Hybrid is likely a better fit