Antonios Chalkiopoulos is a distributed systems specialist, engineering Big Data systems in the past 5 years on Media, Betting, Retail, Investment Banks, and FinTech companies in London. He is the author of Programming MapReduce with Scalding, one of the first books presenting how Scala can be used for Big Data solutions, and an open source contributor to a number of projects.

He is the founder of LANDOOP, a company that specializes in Fast Data and Big Data solutions and provides numerous tools and capabilities around Apache Kafka and real-time streaming systems.

Alexander Hanschke is a co-founder and CTO at techdev Solutions GmbH, a software company based in Berlin. He graduated from University of Mannheim and has worked in the financial sector, building Java enterprise applications for 8 years.

At his company, these days Alex is working on web applications written in Java and Kotlin. He frequently talks at user groups and conferences and is writing about Kotlin-related topics.

You can find him on Twitter at @alexhanschke.