Backend
JVM
Also written as Java Virtual Machine, JVM Tuning
The engine that runs Java (and Kotlin, Scala) programs. 'JVM tuning' means adjusting memory and garbage-collection settings so large Java services stay fast and don't stall.
Think of it like
The engine under the bonnet: every Java developer drives it, fewer can tune it.
Junior or senior?
Everyone in Java uses the JVM; tuning is the differentiator.
Senior sounds like
Has diagnosed a real memory or garbage-collection pause problem in production.
Ask them
“Tell me about a time a Java service was slow or crashing because of memory. How did you find the cause?”