All I can say is to learn the spec. Like how REST works and pick a language and go deeper into it. If you want to be on the safe side, go with Java. It's ther

All I can say is to learn the spec. Like how REST works and pick a language and go deeper into it. If you want to be on the safe side, go with Java. It's there and will never die. You are right with FE technologies keep popping up. But you will have the same issue in the BE. New BE technologies are born to solve a different problem space such as scaling, performance, or things of that nature where as FE is more focused around HTML, CSS and JS. Overall, learn generic concept which are transferable regardless of stacks such as NoSql db such as mongodb, Relationship db such as oracle db, caching with Redis or memcached, message queue such as kafka, text indexing such as elastic search, stream processing such as storm, batch processing such as spark, and a ton of machine learning. With that in mind, BE is aslo rather bloated, but it evolves around more area of concerns and not just CSS, HTML and JS