Google Domain Migration Specialist

I'm looking for an expert to assist with migrating our Google domain. The highest priority is federating all current logins with the old domain to the new domain in Google Workspace. We require Single Sign-On (SSO) for security.

Additionally, we need:
- Migration of all Slack data to the new domain.
- Migration of all Google Cloud projects under the old domain to the new domain.

Ideal skills and experience:
- Expertise in Google Workspace and domain migration
- Experience with Slack and Google Cloud
- Strong understanding of federation and SSO
- Good security practices and configurations

Please provide examples of similar work done and your approach to ensure a smooth migration.