Explore the implementation of a Citizen Science Paradigm in a Python-centric platform through this EuroPython 2015 conference talk. Delve into the challenges and solutions developed for the System for observation and monitoring of Marine Alien Species, utilized by the Italian Institute for Environmental Protection and Research (ISPRA). Learn about strategies for creating crowd-friendly forms, defining workflows for collected data, and selecting optimal technologies for various components, including Android apps, web applications for citizens and experts, webGIS for data browsing, and web services for data exporting. Gain insights into tracking invasive species, addressing typical problems in citizen science projects, and leveraging Python code for XML exporting and integration with the World Register of Marine Species (WoRMS).