A modern programming language that makes developers happier.

kotlinlang

Going to take a best guess on the mysterious JB product ( <https://www.youtube.com/watch?v=w6AxZ_Xraf0> ). Based on some possible hints I am guessing that the product is a software project management tool/platform, which is an alternative to GitHub ( <https://github.com/> ), GitLab ( <http://gitlab.com|gitlab.com> ), and BitBucket ( <https://bitbucket.org/product> ).

That seems to be a common theory. Any guesses on what such a service might be called?

Using the word Jit wouldn't fit since there are many programming languages that don't have their own JIT, or use AOT (eg Kotlin via Kotlin Native).