For front end - react is still wildly popular. Svelte is a newer one that's beginning to gain traction. I wouldn't invest a ton of time in any specific framewor

For front end - react is still wildly popular. Svelte is a newer one that's beginning to gain traction. I wouldn't invest a ton of time in any specific framework (unless you really enjoy using it), but instead would focus on the pros/cons of each one and when they're good choices. For the most part JS frameworks / libs are easy to pick up if you have familiarity with js go begin with. Back end is pretty open. As others have mentioned Go is an up and comer. Hard to predict the market pull for it this early, but it seems promising. Java is still pretty popular, (spring in particular) for web servers. It's not talked about much in the blogosphere but there's a lot of companies that still need java devs. I can't speak to python/erlang, as I don't have experience with either. I think python might possibly be a better sell just because its popular in data science fields. Personally I think c# is still pretty marketable. I wouldn't worry too much about the specific tech stack. These days stack-specific dev's are some a dozen, but finding someone who can pick up a new framework/stack/language quickly and efficiently are rare.