At Click Chain Inc., I led the continuous upgrade of HourTimesheet from Java 8 to 17 and Spring 3.x to 6.x, maintaining backward compatibility and zero downtime for 500+ enterprise clients. I also upgraded its mobile app from Ionic 3 to Ionic 7 in phases to limit customer interruption.
On client projects, I rewrote a VB6 accounting and payroll system as a web app and migrated its archiving tool to Python, reducing average job time from two hours to about five minutes. I also led Payflow, an autonomous payroll AI agent built with Google ADK, Gemini, and RAG that detects and resolves 85%+ of incoming payroll data anomalies.
Portugal
Egypt