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Sherwin John Calleja Tragura started his career as a student assistant and a mathematics tutor during his college years at the University of the Philippines Los Baños, Laguna, Philippines. With meager resources, he graduated as a Department of Science and Technology (DOST) R.A. 7687 scholar under the Bachelor Of Computer Science degree. Immediately after graduation, he took up the offer to teach CMSC 150 (numerical and symbolic computation) at the Institute of Computer Science and completed his master's degree in computer science simultaneously. He became part of the International Rice Research Institute (IRRI) software team, which gave him the opportunity to use Struts, Spring, and RCP frameworks in many of its software projects.

Based on his experience at IRRI, he was given an opportunity to work as a Java analyst in various companies in Manila, such as ABSI, PHILAM- AIG, and Ayala Systems and Technology Inc. (ASTI). These companies have strengthened his skill set through training in Java and Java Enterprise platforms and some popular tools such as EMC Documentum, Alfresco Document, and Records Management System. He got his first career certification in the EMC Documentum Proven Associate course (E20-120).

After a few years, he decided to become an independent consultant and trainer, providing services mostly for Java-based projects, Alfresco, and Apache OFBiz requirements. He started his venture as a Java-JEE Bootcamp with 77Global and is currently a trainer at Software Laboratory Inc. (SLI), Alibata Business and Technology Services Inc. and Nityo Infotech, Philippines. He also conducts training and talks around the Philippines, for instance, in Cebu City and Tacloban City.

Sherwin has contributed as a technical reviewer to various books by Packt Publishing, including Delphi Cookbook, Alfresco 3 Records Management, Alfresco Share, and Mastering Hibernate. He owes everything to Packt Publishing with the unforgettable experience in the technical reviewing tasks, which have been an essential part of his career.

As an Oracle Certified Associate and Java SE 7 Programmer (1Z0-803), Sherwin will continue his mandate as a technical trainer, developer, architect, and designer to help the industry improve its standards in information technology. He will always be an epitome of honor, excellence, and service when it comes to software development and business intelligence.