This depends on what you mean by "technology". I would expect them to be aware of emerging trends in the industry. Bonus points also for an interest in the latest computer science. But I don't care if they haven't hacked on groovy gradle scripts or injected Spring AOP pointcuts into Java beans. This sort of tech is accidental ad-hoc complexity and not progress.
Spring's AOP pointcuts (in its first incarnation as AspectJ) and Groovy (pre-Gradle and pre-Apache) are both over 15 yrs old. To not know those is having a skillset that's well over ten years out of date.
Heck, I know what those are and I've only written 20 lines of production Java code. They came up repeatedly when I was researching using Microsoft's (now defunct) Unity framework to do AOP in C#.
It’s not about “emerging trends” but they should be familiar with a chosen technology stack that is in the “plateau of productivity” in the hype cycle.
