I started software development almost 40 years ago when I was 14 years old on an BASF 7130 programing Basic...
I went to the "adult education center" to learn Tubo-Pascal and sold my first software when I was 16 years old...
As an employee, I developed software for the banking industry e.g. developing online-banking-software and multiple enterprise application integrations e.g. to the Berlin-Stock-Exchange, IBM Host 3270, Brokat, Miles & More, lots of other systems