We managed a several thousands node cluster of perl services. We took several years, but we recently finished migrated all of this off from stateful Perl to stateless Go all the while growing rps volume 40% yoy and migrating datastores as we scaled those too, continually improving stability and availability, adding features, and scaling the org from a few hundred people to a few thousand. We are now 100% off perl for our critical path.

Perl is not on my resume :)