Hi Pete!
Functional works hub does a good job of collecting Haskell vacancies:
https://functional.works-hub.com/haskell-jobs. Standard Chartered is definitely the elephant in the room. They regularly post
plenty of vacancies. Several companies have many Haskell projects in their portfolio (see
https://serokell.io/ or
https://www.tweag.io/ for examples). I wouldn't say that there is some specific niche. In fact, Haskell is usable everywhere, from blockchains and financial applications to web development. As far as I know, juniors are always welcome. I think we experience a shortage of developers at all levels.