[Aearnus]

I wouldn't really call APL/J/K "lost" (or "dead", or "useless", or...). There's an active community on Reddit and there's a pretty active circle of APL'ers on Twitter. It wasn't ever a super mainstream language, but it's definitely not lost its appeal -- maybe even as a fun hobbyists' language.

[smabie]

kdb+/q is reasonably popular. And the salaries are very very high. I know some q guys pulling in over a million/year.

[non-entity]

Wow I had never heard of those technologies before. What kind of background would you have to have to get a job like that? What companies are hiring people on damn near a million?

[smabie]

Banks. Maybe some hedge funds or prop trading shops, but mostly banks.