The operator
I started at nineteen as a Java intern and stayed because the interesting problems were one layer down, in the infrastructure. By the end I was head of operations: data centre, high availability, monitoring, and the move from Subversion to Git before that was fashionable.
The job that changed my career was leading the migration of an on-premises SaaS platform into the public cloud, from market analysis through planning to execution. I learned that the hard part of infrastructure is rarely technical.