Erik Zeitler is a data infrastructure architect at the online and mobile payments provider Klarna. He has taken the lead on adopting a big data system for Klarna following the Lambda architecture. Erik has also been active in analyzing performance issues in Klarna’s operational systems. Erik holds a PhD from Uppsala University, where he developed SCSQ, a highly scalable data stream management system. His research work is published at conferences such as VLDB and EDBT.