Sithu Aung

Experienced Java Software Engineer with over 12 years in backend and full-stack development. I've worked on large-scale systems for government, healthcare, and infrastructure projects in Singapore. I'm skilled in Java, Spring Boot, microservices, APIs, and database optimization, with hands-on experience in Docker, Linux, and occasional frontend work using Angular or React. Recently, I restructured multiple legacy Java projects used across four hospitals into a single, well-organized solution. By applying design patterns (like Factory and Behavioral), OOP, and SOLID principles, I made the system easier to maintain, extend, and scale - with minimal code changes. This helped reduce duplication, improve performance, and make the system more future-ready. I'm always eager to learn, adapt to new challenges, and help teams build secure, reliable, and scalable software.

Enterprise & Government Projects

• Singpass Authentication Integration: Successfully migrated and enhanced Singpass authentication for a government project, ensuring seamless user access and high security.
• Visitor Management System: Led the design and development of a secure and scalable Visitor Management System for multiple Singapore healthcare institutions and government agencies.
• New Booking Mode Development: Engineered a complex booking system for a government agency, enabling secure and efficient appointment scheduling during COVID-19, reducing wait times and enhancing accessibility.
  Facial Recognition System Deployment: Successfully implemented and deployed a new system integrated with a 3rd-party Facial Recognition platform using Docker and Linux , ensuring seamless performance in a production environment.

Performance & Optimization

• Database Performance Boost: Optimized SQL queries and Java API logic, improving system response time from seconds or minutes to stable milliseconds , ensuring consistent and high-performance operation under load.
• System Performance Enhancement: Increased peak-hour system efficiency by 30% through targeted optimizations in API and database interactions.
• Database Deadlock Resolution: Identified and fixed a critical database deadlock , ensuring high system availability and stability.

Security & Infrastructure Enhancements

• Security Hardening for Online Systems: Implemented critical security fixes for online registration systems in major Singapore hospitals to protect sensitive user data.
• Scalable Web Service Development: Refactored and enhanced NGEMR web services, boosting API processing times by 25% while ensuring compliance with secure coding practices.