It might depend on whether you differentiate between cutting edge and hype. Scala (for sure) and micro-services (probably) are still very niche. It's not as tho

It might depend on whether you differentiate between cutting edge and hype. Scala (for sure) and micro-services (probably) are still very niche. It's not as though there has been a generation of software written in them - they've had several years to pick up steam and now they aren't "exciting". Off the top of my head the things that are exciting enough to make news simply by existing is "serverless" XYZ and "AI" where AI is never really defined well enough to pin down. You would probably be better served to learn something you are interested in than being able to say you are fluent in the NN library du jour.