Well the quick answer is JavaScript is needed everywhere.
I'd bone up on that, and learn angular inside and out as well as a couple of other JavaScript frameworks for good measure. That's what gets me hired as a C# developer in php, ruby, and java shops where I can then gradually show them I know UX, devops, and other little valuable things. The trick is that the hot thing in short supply will change this time next year and you'll need to keep a finger on the pulse of it and learn that if you're looking to job hunt.
I'd bone up on that, and learn angular inside and out as well as a couple of other JavaScript frameworks for good measure. That's what gets me hired as a C# developer in php, ruby, and java shops where I can then gradually show them I know UX, devops, and other little valuable things. The trick is that the hot thing in short supply will change this time next year and you'll need to keep a finger on the pulse of it and learn that if you're looking to job hunt.