Last couple of years I've been working mostly in Web Development where I enjoyed working on "both ends".
I have experience with REST APIs, as I've created a few from scratch (mostly in PHP's Symfony or Node.js + Express). I also worked with Angular and Vue.js in which I configured the SSR and created a couple of PWAs besides "ordinary" things. When it comes to server-related things, I'd go with docker and mostly alpine linux.
I've been self-studying Computer Science - mostly Algorithms & Structures. I'm obsessed with performance and try to improve my skills whenever possible.