Front or back end web development in JS/TS/Python/Java/C#/PHP or any other relevant tech stack you can imagine. And if I haven't used it it's about a day before I can. But 6 years has left me well equipped. If you are not sure I can do it, ask. But pretty much if has to do with web development, from cloud to monoliths to apis, to front-ends, I do it all.