• Integrated and optimized Software Quoting System with SAP, serving 55,000+ channel partners globally with zero downtime quoting service experience. - Technologies: SAP (Python), Java, Spring Boot, Redis, Apache Kafka, DB2• Onboarded and maintained APIs into IBM API Connect Hub with usage analytics, real-time monitoring and 24/7 alert detection. - Technologies: Java, Spring Boot, IBM API Connect Hub, Swagger• Managed deployment scripting of CI/CD pipeline development for microservices architecture, applying TDD with unit and mock tests to ensure 100% bug-free incidents. - Technologies: Jenkins, Docker, GitHub, Kubernetes, Mockito, Junit, Agile

• Led the development of a secure IAM system with 2FA integration and authentication / authorization methodology on mobile apps for 9,000+ students and staffs, reducing cyberattack risks by 40% and stopped 100% of all automated attacks.- Technologies: Java, Spring Boot, JSF, JWT, Oracle Coherence• Delivered E-Certificate digital signature, reducing the workload of Employer’s HR department to verify the authenticity of student certificates by 100%.- Technologies: Python, React• Delivered mobile app for sports facility booking, reducing booking times by 70% and enhancing e-payment integration.- Technologies: Nodejs, React Native, PHP Codeignitier• Automated deployments with a CI/CD pipeline, accelerating release frequency by 70% and eliminating manual deployment errors by 100%.- Technologies: Jenkins, GitHub, Jira, Agile

• Developed a corporate CS portal, driving a 21% increase in revenue for the 4G network service line.- Technologies: Java, Spring Boot, AngularJS, jQuery• Improved codebase for Customer Equipment portal and CRM, boosting code quality and maintainability by 70%, saving 0.5 man-day per installation for 500 engineers.- Technologies: Java, Hibernate, JSF

• Built and maintained the corporate portal and sales portal, serving 400+ internal users.- Technologies: Java, Spring, MyBatis, PLSQL• Enhanced mobile-responsive design for Wi-Fi hotspot UI, improving the experience for 200+ connected devices.- Technologies: Bootstrap, JavaScript, jQuery.

• Designed and developed an RFID Kiosk Car Park system for an airport cargo terminal, supporting 3.5 million tons of cargo annually. Improved truck clearance speed by 60% using RFID tags. - Technologies: Java Threading, JFC, Swing, JAX-WS, CXF, Axis

• Developed and integrated the Purchasing Requisition System with SAP, increasing operational efficiency.- Technologies: Java, JSP, SAP, SOAP API

• Replaced and integrated a new Billing Mediation Platform System and transit data to Oracle DB for rating, improving transit speed by 50% and reducing batch processing time by 15 minutes- Technologies: C / C++, java, Oracle DB