Led development of a multi-tenant Sub-Domain Tenant Management platform, built authentication and provisioning flows, designed RESTful APIs, optimized MySQL database performance, developed deployment agents for Kubernetes, implemented microservice execution platforms, integrated AI-assisted web crawling, maintained AWS SQS-based backend systems, and automated dependency security using GitHub Actions.

Developed a nationwide cashier platform, integrated electronic invoicing with SIN SIAT services, implemented JWT/OAuth security, optimized SQL query performance for high-transaction volumes, and built GitLab CI/CD pipelines with unit testing.

Built a case-management and reporting platform with map-based visualization, designed secure REST APIs with RBAC, and maintained Dockerized deployments with Nginx and GitLab CI/CD.