I am a software development professional with hands-on experience in Java/JEE, Spring Boot, REST/SOAP APIs, and modern front-end technologies. I enjoy collaborating with cross-functional teams to deliver robust enterprise applications and to establish code standards and design guidelines that improve maintainability and quality. Currently, I am expanding my expertise in Python and computer vision, exploring opportunities to apply machine learning and image processing to real-world problems while continuing to optimize solutions through CI/CD, cloud, and agile practices.

Denver M. Crisostomo

I am a software development professional with hands-on experience in Java/JEE, Spring Boot, REST/SOAP APIs, and modern front-end technologies. I enjoy collaborating with cross-functional teams to deliver robust enterprise applications and to establish code standards and design guidelines that improve maintainability and quality. Currently, I am expanding my expertise in Python and computer vision, exploring opportunities to apply machine learning and image processing to real-world problems while continuing to optimize solutions through CI/CD, cloud, and agile practices.

Available to hire

I am a software development professional with hands-on experience in Java/JEE, Spring Boot, REST/SOAP APIs, and modern front-end technologies. I enjoy collaborating with cross-functional teams to deliver robust enterprise applications and to establish code standards and design guidelines that improve maintainability and quality.

Currently, I am expanding my expertise in Python and computer vision, exploring opportunities to apply machine learning and image processing to real-world problems while continuing to optimize solutions through CI/CD, cloud, and agile practices.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
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Language

English
Fluent

Work Experience

Sr. Java Developer at PersolKelly Singapore Pte Ltd.
April 1, 2022 - Present
Maintain and enhance FPMS subsystem; Struts-based MVC/front-end API; JQuery-based client-side behavior; Oracle PL/SQL for data updates and retrieval; XML/XSLT for document transformation; collaborating with Great Eastern Singapore.
Sr. Java Developer at Talentium
December 1, 2021 - April 1, 2022
Supports and enhances eOperation Project Information System; UI implemented with Oracle OAF and ADF (JSF-based); Oracle PL/SQL for DML; Oracle 11g DB; Azure DevOps for Git repos and team sprints; Power BI for dashboards and analytics.
Engineer 2 at Murata Energy Devices Singapore
February 1, 2017 - October 1, 2021
Administration, development, and support of MES and CIM applications; vendor liaison; budgeting for hardware and software; documentation; walkthroughs for upper management; designed JavaFX standalone software with DB integration and a JavaFX KIOSK app with REST and WebSocket communications.
Java/J2EE Developer at RCG Global Services
April 1, 2013 - August 1, 2016
Resolved defects in web applications; designed technical resolutions for defects; frontend work using AngularJS; Git for versioning; Maven for builds; contributed across financial and corporate projects.
Java/J2EE Developer at Laurysis
June 1, 2011 - March 1, 2012
Implemented JSF pages with Oracle ADF; managed beans; OPSS security; WebLogic management; JQuery-based UI enhancements.
Java/J2EE Developer at KForce Global Solutions, Inc.
January 1, 2011 - April 1, 2011
CTOM DMWEB – CLPGAS Global: XHTML pages; JSF 2.0 with composite components; Ajax via JQuery; CSS for page layouts; PL/SQL for backend integration.
Java/J2EE Developer at KForce Global Solutions, Inc.
August 1, 2010 - December 1, 2010
CTOM PLNET – Singapore: bug fixes and enhancements to Chartis eAuto Insurance web app (PRPC 5.5); rule creation and testing in DEV/SIT; bug analysis and CQ monitoring.
Java/J2EE Developer at KForce Global Solutions, Inc.
September 1, 2009 - July 1, 2010
Willis Insurance – Noodle: analyze insurer structures; update SQL scripts; test marketing materials; map records from database to XML; JSP page enhancements.
Java/J2EE Developer at KForce Global Solutions, Inc.
February 1, 2009 - September 1, 2009
Zuellig – Zip-Online (ZOL): lead ZOL enhancements; team leadership; Spring framework training; project proposals and initial timelines; code reviews and bug fixes.
Java/J2EE Developer at KForce Global Solutions, Inc.
March 1, 2008 - February 1, 2009
CTOM PAWEB DBG: Electronic Claims Services Online; Loss Extract; performance testing; backend with Hibernate, Spring, and J2EE.
Java/J2EE Developer at Depository Trust & Clearing Corporation (DTCC)
March 1, 2012 - March 1, 2013
Support CTM (Central Trade Manager) Java Applet-based components; tools include AccuRev, Eclipse, WebLogic 11g; Linux; Oracle SQL Developer; XML/XSLT.
Sr. Java/J2EE Developer at MYRIDIUS (former RCG Global Services)
April 1, 2013 - August 1, 2016
Client: Macquarie. Delivered Java/J2EE solutions across banking/finance domains; contributed to ELMS/BSF projects; worked with AngularJS frontend, Hibernate/Spring, and Oracle databases; supported BASF ELMS project with Oracle 10g and LDAP integration.
Java/J2EE Developer at Vertere Global Solutions, Inc. (former KForce Global Solutions, Inc.)
March 1, 2008 - April 1, 2011
Clients included AIG Insurance; developed Ajax-based UI, backend Java, Oracle DB, XML/XSLT; participated in CTOM DMWEB/PLNET projects, Willis Insurance – Noodle, and Zuellig Zip-Online (ZOL); implemented LDAP login, JSP/JSF components, and web services.
Java/J2EE Developer at Sykes Asia
August 1, 2007 - February 1, 2008
Client: Emerson Climate Technologies. Web-based eCommerce tooling; migrated sites to JSP/Struts, migrated database from Access to SQL Server, implemented MVC patterns, and integrated IBM WebSphere.
Java/.NET Developer at Information Professionals, Inc
April 1, 2005 - August 1, 2007
Clients include DHL Express. Projects include DHL Easy Tool (Swing/Java), Sales & Planning Development Application, PH Service Desk Application, and Learning & Development applications; built using Java/.NET technologies and MS SQL Server.

Education

Bachelor of Science in Computer Science at AMA Computer University
January 1, 1999 - January 1, 2004
Bachelor of Science in Computer Science at AMA Computer University
January 1, 1999 - January 1, 2004

Qualifications

1Z0-807 Java EE 6 Enterprise Architect Certified Master
January 11, 2030 - December 11, 2025
Oracle Certified Expert, Java EE 6 Web Services Developer
January 11, 2030 - December 11, 2025
Oracle Certified Expert, Java EE 6 Enterprise JavaBeans Developer
January 11, 2030 - December 11, 2025
Oracle Certified Professional, Java EE 5 Web Component Developer
January 11, 2030 - December 11, 2025
CSA – Pega Certified System Architect (Pega Rules Process Commander ver 5.5)
January 11, 2030 - December 11, 2025
1Z0-807 Java EE 6 Enterprise Architect Certified Master
January 11, 2030 - March 21, 2026
Oracle Certified Expert, Java EE 6 Web Services Developer
January 11, 2030 - March 21, 2026
Oracle Certified Expert, Java EE 6 Enterprise JavaBeans Developer
January 11, 2030 - March 21, 2026
Oracle Certified Professional, Java EE 5 Web Component Developer
January 11, 2030 - March 21, 2026
CSA – Pega Certified System Architect (Pega Rules Process Commander ver 5.5)
January 11, 2030 - March 21, 2026

Industry Experience

Software & Internet, Financial Services, Manufacturing, Professional Services, Government, Education

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
See more