Video and slides synchronized, mp3 and slide download available at URL https://bit.ly/2FRILKh. Aris Koliopoulos talks about how common problems in social media, such as analysing user sessions, counting big numbers and making real-time recommendations can be resolved with a healthy mix of stream processing and functional programming. Filmed at qconlondon.com. Aris Koliopoulos is Backend Engineer at Drivetribe.