Sebastián has been a Docker fan for a long time. He started using it in 2015 when he introduced it at the company he was working for in Colombia. He built several Docker images for deploying applications in Python with Flask and others. Sebastian continued using and recommending Docker across different jobs with teams in Saudi Arabia, Qatar, Dubai, Berlin, etc.
In 2017, he created FastAPI, a Python framework that has been growing in adoption. He wrote a whole section to explain containers and Docker in the documentation to help evangelize the use of Docker within developers.