Production-grade systems, distributed microservices, and modern web applications built with Java, Spring Boot, React, and PostgreSQL.
A full-stack online store and point-of-sale (POS) system engineered with React, Spring Boot, PostgreSQL, and Redis, featuring inventory management, barcode scanning, and Bakong KHQR dynamic payment integration.
Product & inventory management with automated stock alerts; Point-of-sale checkout system with barcode scanning; Digital game top-up & instant voucher code generation.
A two-sided service marketplace connecting customers who need services with verified local service providers, featuring categorical browsing, job requests, and role-based access control.
Customer registration, service discovery & categorized browsing; Local service provider onboarding with portfolio verification; Real-time service booking requests with job details & scheduling.
A collaborative developer community and vulnerability triage platform. Personally engineered the Organization Service APIs, User Profile features, and Keycloak authentication workflows.
Bug bounty program publishing & vulnerability reporting workflows; Organization Service APIs for security program management; User Profile services with researcher reputation & badges.
An academic ERP and school management backend system engineered with Java, Spring Boot, PostgreSQL, and Hibernate for student record lifecycles, enrollment concurrency, and grade calculation.
Student record and lifecycle management; Academic grade and transcript processing; Classroom capacity and enrollment constraints.