The two main contributors are just busy in their "real" jobs. https://github.com/ModiaSim/Modia.jl/graphs/contributors

I work as a full time Modelica programmer :-) And I do have colleagues.

Not fully up to date, but a starting point: https://modelica.org/jobs

Very cool - what sort of education do you have / need?

Some more industry case sturdies here: https://www.modelon.com/industries/