SIBS, 1992. Mainframe operator.
I started as a mainframe operator at SIBS — Portugal's interbank payment processor — in 1992. COBOL, CICS, DB2. If I made a mistake, the consequences were not abstract. They were measured in queues at supermarket checkouts, terminals going dark in restaurants, transactions failing at three in the morning.
That was my first lesson, and the one that has framed everything since: enterprise IT is not theoretical. It is operational. The system either works for the person tapping a card, or it does not. Documentation, governance, framework choice — all of it is downstream of that single test.