Finding good developers is a struggle, almost regardless of where in the world you've set up shop. So finding 10-20 good developers, a significant portion of wh

Finding good developers is a struggle, almost regardless of where in the world you've set up shop. So finding 10-20 good developers, a significant portion of whom would have to be quite senior, probably means your "3. Availability of developers" should be "0. Availability of developers". Basically, any language / ecosystem that should meet your most basic business and technological requirements should be heavily in contention if it is among the most widespread in the community where you're situated. And similarly, if a language is significantly less common than a language that meets the requirements, you probably shouldn't consider it. Whether that is Python, Go, Haskell or something altogether different, only you know.