Berin has helped define and document the Avalon projects since 2000. He has been involved in Apache Avalon and Apache Cocoon. He is the author of the current thread-safe pool implementations as well as the DataSourceComponent. Berin and Giacomo Pati were the architects of Excalibur's Component Management infrastructure.

Outside of the public view of the Apache Software Foundation, Berin has developed workflow based web applications as well as data manipulation services. He has nine years of experience developing database backed applications, and eight years experience with technical writing. Berin has only been developing Java since 1999, but his background in other Object Oriented Languages and architectures like C++ and CORBA helped him get a jump start.