@Vaughan_Rouesnel (and @Shelby_Molyneux),
Might this work: When the developer’s work is ready for review, Create Follow-up Task (Tab-Shift-F) “Needs Review: <original task name>” which links to the main task and multi-home that task to a Needs Review project where all potential reviewers are project members. They will receive a notification of the new task; that’s the signal that one of them should claim it.
Another approach is to define a pseudo user if you would prefer to assign the main task or follow-up task to someone representing potential reviewers. You would have to one-time make an email address (info+potentialReviewers@mycompany.com is what Gmail lets you do) and create the Asana account for that email. When ready for review, assign to that pseudo user and have a report of incomplete tasks assigned to reviewers, and/or use the follow-up with that assignment if you want some assignment.
I hope that maybe stimulated some potential solutions (workaround; whatever one would call them!).
Thanks,
Larry