Both, though since going pro, I have less time for hobby coding. Or rather I should say, my eyes and brain can only take so much.
I've been a hobbyist script guy for a long time, and had no aspirations to start a career as a SWE. The opportunity just fell into my lap, when I joined a startup in an entry level support position, and wrote some tools to make my workflows easier. A director took notice, and got me a position on a new engineering team. The rest is history. Turns out I really like doing it professionally, as well.
I'm a BE engineer, working mostly in Python. Telecommunications stuff, can't really say more.