Some of the topics I find most interesting:- Networking (Load balancers & reverse proxies are a challenge to get working properly sometimes, but they're so entertaining when they work)- Horizontal & vertical scaling- Containerized applications- Mazes & their intricacies (did you know that different maze generations might have more dead ends, while some may be perfect vs imperfect?)- Productivity automation (anything to make my life easier when I'm building software)- Diagrams (any kind of technical or pretty diagrams are so satisfying)- Game Balance (something about the charts and trying to make the numbers work in a spreadsheet is so satisfying)