Jens Kleemann has been in the software business for more than 20 years, focusing on Java and certain aspects of system design & architecture for 10 years. Over the last years he worked on distributed systems using Jini and custom solutions consisting of up to 350 machines. He is interested in technologies or designs which help to create more efficient (not necessarily faster) solutions. That involves performance tuning, identifying bottlenecks and finding a way to avoid those bottlenecks once they are identified. He is the head behind "chameleon/XML", an extreme-throughput middleware which offloads heavy duty processing or workloads (mostly complex XML processing) from the application servers.