My first job was a statistical program that i wrote during a trainee at a local IT department.
My boss liked it and told me I could keep the sources and the copyright.
Then he made some phone calls and helped me to find my first clients.

Since that time I am working on the same program.
I founded a software company and have a good life now.

My old boss retired some years ago, but some of the team are still there.
From time to time I visit the department having a coffee with old friends.

That trainee was nearly 30 years ago.