Mariusz Gil is software architect focused on high performance and scalable web applications. Trainer, consultant, meetups organizer and conference speaker. He has been working for several companies on projects for millions of active users, from biggest social network and instant-messaging software in Poland to multi-billion PV content personalization and discovery platform. Mariusz is also involved at 4Developers, PHPCon Poland and DDD Now conferences. Big-data enthusiast and data-scientist wannabe. After hours, biker and rock guitarist.