I am Dmitrii (Dima) Pasechnik a mathematician and a computer scientist, working full-time (funded by a Horizon 2020 EU project) on developing/maintaining a computer algebra system SageMath (http://sagemath.org). It is basically a huge Python library pulling in components developed in C/C++/Fortran/Cython/Common Lisp/... (and few obscure domain-specific "maths" languages). And even a literal SageMath programming LaTeX package :-)
(Today I mostly wrote/debugged m4 macros :-( )
functional.cafe is an instance for people interested in functional programming and languages.