I have been working as a professional software developer for over 25 years. My experience includes writing or contributing to large systems in languages such as C++, Tcl/Tk and Python, web development and design (back and front ends) in PHP, Python/Flask, HTML/CSS/JavaScript, as well as experience with some more esoteric languages, including functional programming.
In the past 10 years I have been developing mainly in Python, and for the last 3 years, I occupy the position of the Python instructor for beginners in my organization, with a potential audience of thousands of developers in our site. I have delivered the full day course to around 500 learners in my company.