If you have been around for a sufficient number of tech cycles you already have conceptually analogous systems in your head, which you just have to remap to the new syntax. That's what makes a "senior".
The frontends are actually the hardest to stick with because they turn over fastest, probably followed by distributed-compute solutions. C# is a short walk from Java, SQL has been around for decades(even given dialect differences that change best practice).
The frontends are actually the hardest to stick with because they turn over fastest, probably followed by distributed-compute solutions. C# is a short walk from Java, SQL has been around for decades(even given dialect differences that change best practice).