Наконец-то могу поделиться своим докладом на SymfonyCon Amsterdam 2019.
https://symfonycasts.com/screencast/symfonycon2019/how-to-contribute-to-symfony-and-why-you-should-give-it-a-try
https://symfonycasts.com/screencast/symfonycon2019/how-to-contribute-to-symfony-and-why-you-should-give-it-a-try