Production work, platform systems, and side projects that were built to hold up.

Standalone multi-tenant payment gateway service with HMAC-SHA256 signing, JWT authentication, and merchant management system.

• Contributed 3,680+ lines of production code in 2 weeks
• APIP-compliant multi-tenant architecture

Complete A-to-Z ticket purchase flow with Type Approval compliant payment monitoring and automated reconciliation.

• Type Approval compliant payment monitoring system
• 99.9% transaction success rate

Full-stack healthcare appointment booking platform mini-program within Octopus app, featuring React frontend and Spring Boot backend with AWS integration.

• 5,277 lines of code (39 commits) in 5 days across frontend and backend
• Bilingual support (English/Traditional Chinese) with i18next and backend Accept-Language headers

Full-stack AI-powered trip planning platform with 5-step questionnaire, drag-and-drop itinerary management, and admin portal for event management.

• ~15,000 lines of code across 150+ files
• Multi-language support with 1,500+ translation keys across 3 languages

Bilingual promotional campaign website with real-time leaderboards, JWT authentication, and comprehensive analytics tracking for Mobile Octopus rewards program.

• 41 commits over 57-day intensive campaign period
• Fixed critical mobile rendering issues across 5+ device types (iPhone SE to Galaxy S8+)

Responsive recipe and blog platform with Sanity CMS integration, featuring desktop/mobile layouts and multi-language support.

• ~400 lines of production code across 8 merged pull requests
• Fixed 3 critical bugs (URL routing, mobile layout, font consistency)

Mobile-first loyalty program platform with missions, promotions, offers, and eStamps, featuring Ionic React components and AEM integration.

• 26 commits delivering 9,264 lines added in 2-week sprint
• Complete missions and promotions systems with filter/sort capabilities

Full-stack proprietary trading platform for Southeast Asia, from challenge purchase to funded account, MT5 provisioning to profit withdrawal, all custom built.

• C# microservice achieved ~175ms p50 latency vs ~443ms on legacy MT5 Web API, 2.5× faster
• Single root cause, two bugs: missing ORM filter caused both a production crash and a full-table performance scan

Solo-architected, solo-built two-sided service marketplace for Malaysia, Go backend, Flutter mobile, Next.js web, PostGIS spatial matching, and a full escrow payment engine.

• 90+ REST API endpoints, 13 PostgreSQL tables, 30+ Flutter screens, 20+ Next.js pages, all solo
• PostGIS spatial triggers auto-sync lat/lng → geometry columns on every insert/update, enabling native radius queries

Built distributed virtual goods inventory system managing millions of game items across 20+ international gaming titles.

• Managing millions of virtual items across 20+ game titles
• Part of 31 feature developments and 20 bug fixes

Built unified API gateway serving as integration hub for game services with standardized authentication and rate limiting.

• Serving multiple game titles across international regions
• Part of comprehensive AMS platform ecosystem

Developed comprehensive points and rewards platform managing player loyalty programs across international gaming ecosystem.

• Managing player loyalty across multiple game titles
• Processing daily point transactions reliably

Created comprehensive admin portal empowering operations teams to manage campaigns, players, and content across 20+ games.

• Supporting operations staff across multiple regional offices
• Managing concurrent marketing campaigns

Built monitoring infrastructure (监控平台 & 日志管理) providing real-time visibility into system health across all AMS services.

• Monitoring all AMS microservices and systems
• Hourly dashboard checks for system health

Developed multi-language template system supporting 15+ languages with self-service export functionality.

• Supporting 15+ languages including Myanmar, Thai, and Arabic
• Self-service export reducing operational overhead

Full-stack sports platform with Next.js frontend, PHP/CodeIgniter backend, and comprehensive SEO optimization.

• Increased website traffic through SEO optimization
• Custom iframe integration for event embedding

Achieved 95% SQL query performance improvement through database optimization and query restructuring for external client.

• 95% improvement in SQL query performance
• Significantly reduced query execution time

Simple company website built over existing boilerplate with basic customization and content management.

• Built over existing boilerplate foundation
• Simple informational corporate website

Provided limited assistive support for healthcare SDK development on iOS and Android platforms.

• Assistive role in multi-platform SDK project
• Limited involvement in mobile development