When I first started my current job, 2.5 years ago, I helped write the class that told the machine how to dispense and deposit money.

When the other programmer left, I decided to refactor that section. I wrote a new class that told the machine how to dispense and deposit money.

We are integrating new hardware that has a very different protocol of communication. I am making a library that will convert universal commands into vendor specific function calls. I am writing a new library that tells the machine how to dispense and deposit money.