Since the person sought would "Define success metrics and reporting needs to monitor post-launch performance" of "this new family tree system" called "Big Tree," it does sound like a re-run of OWT, possibly in a wiki-tree version.
FamilySearch's "Family Tree" and its predecessor are not the only borg-trees on the web. The "success metrics" are indeed the main issues.
It is funny that they could not decide whether they are looking for a "Principle" or a "PRINCIPAL". Still don't have dictionaries on-site?