Yes it is possible for a Cloud Build Place user to be assigned multiple build place roles.
These Assignments can be made by the Build Place Administrator.

Further guidance regarding assigning Build Place roles can be found here:
https://docs.ifs.com/techdocs/22r1/020_lifecycle/020_getting_started/#grant-or-revoke-access-to-build-place

This FAQ article may also be useful:
 

Also refer to:
 

Just a additional note. We did experience issues when a “support.ifs.com” email was assigned assigned IFS Cloud Build Place roles. We used different emails for Build Place and the portal as a workaround.