Practically. I met Jira at version 3. I helped migrate JAC, EAC-J, JDOG and more.
I've done On-Demand. I've taken Jira to AWS and built deployment and IAC for EC2-native Atlassian deployments.
I've combined instances and torn them apart. Server, Data Center, Cloud, hybrids...
Find me in Anaheim if you want tales.