Started enjoying Python's versatility over 10 years ago and have used it since then for scripting, scraping, networking, testing, data analysis and web development.
I've used the Python ecosystem as a researcher, a tester, a developer, an architect and a technical lead, appreciating different parts as my interaction with the ecosystem changed. In the past 5 years I've led the development of several non-trivial web applications based on the Python stack.
I've contributed back mainly through evangelisation, teaching others and pushing colleagues to give talks at conferences.