I've been building software for more than 20 years, from particle accelerators to the web. I find bugs and chase them until they're not just fixed but understood. I'm an enthusiastic advocate of the general idea of testing - PLEASE WRITE TESTS!
I also strongly believe that the most productive thing senior developers can do is mentor the developers around them; the best way of preventing bugs is to make the whole team write better code.
In addition to writing code, I've recruited & lead engineering teams at 2Checkout and Dev Bootcamp.
In my spare time, I make weird noises with modular synthesizers.