01 / SELECTED WORK · FLAGSHIP ARCHITECTURES

Operational Software & Architecture

Four production systems engineered for mission-critical workflows, concurrency control, and physical hardware bridges.

SYS / 01 · HEALTHCARE PLATFORM PRODUCTION DEPLOYMENT

Dental Clinic Management System

Domain-Driven Clinical Operating System with Real-Time Server-Sent Events (SSE) Queueing & Multi-Surface Odontograms

ROLE Lead Full-Stack Systems Developer
ARCHITECTURE 16 Decoupled Domains (DDD)
CONCURRENCY & SSE LiteSpeed 2KB Flush Buffer

Built from the ground up without third-party frameworks. Encapsulates 16 autonomous domains through strict Controllers → Services → Repositories → DTOs layering. Features interactive canvas tooth-by-tooth charting, SOAP consultation notes, and live waiting room audio broadcasts.

Custom PHP Layering MySQL (InnoDB) Server-Sent Events (SSE) Service Worker / PWA Odontogram Canvas
VIEW SYSTEM BRIEF →
clinic.internal.local // doctor-workspace ● LIVE PROD
Dental Clinic Management System Doctor Command Center
bir-compliance.engine // lifecycle-topology ● SPEC VERIFIED
BIR E-invoice Order-to-Compliance Execution Lifecycle
SYS / 02 · COMMERCE & COMPLIANCE ACTIVE DEVELOPMENT

BIR E-invoice

Enterprise Commerce Ingress & Automated Philippine BIR EIS Fiscal Invoicing Engine

ROLE Full-Stack Systems Developer
CONCURRENCY GUARD MySQL Pessimistic Sequence Lock
HARDWARE PROTOCOL Raw ESC/POS Thermal Spooler

Automates the entire order-to-tax lifecycle for high-volume marketplace merchants. Ingests Shopee Open API v2 orders, calculates exact 12% VAT breakdowns across taxable and exempt lines, prevents invoice sequence numbering race conditions via pessimistic database transactions, and spools raw binary thermal receipt streams over TCP.

Laravel 11.56 PHP 8.2+ lockForUpdate() 12% VAT Engine ESC/POS Thermal Protocol
VIEW SYSTEM BRIEF →
SYS / 03 · OPERATIONS & IOT PRODUCTION DEPLOYMENT

Flexzone

Gym Operations Platform with Asynchronous Cross-Device QR Attendance Kiosk Bridge

ROLE Full-Stack Systems Developer
HARDWARE BRIDGE Phone-to-Desktop Optical Kiosk
PAYMENT RECONCILIATION Idempotent Xendit Webhooks

End-to-end commercial fitness management platform. Features an engineered optical scanner bridge that eliminates the prohibitive cost of physical optical turnstiles by turning ordinary smartphones into wireless gate scanners with atomic file mutex validation (<200ms latency).

PHP 8.x Monolith MySQL (Relational) Xendit Payment API HTML5-QRCode Engine Atomic File Mutexes
VIEW SYSTEM BRIEF →
flexzone.ops // branch-console ● PROD V1.0
Flexzone Gym Platform UI Screenshot
bayanlink.monorepo // distributed-architecture ● PHASE 4 ACTIVE
BayanLink Distributed Monorepo Architecture Diagram
SYS / 04 · CIVIC INFRASTRUCTURE PHASE 4 ACTIVE DEV

BayanLink

Multi-Tenant Civic Operations & Real-Time Incident Triage Dispatch Infrastructure

ROLE Lead Full-Stack Systems Architect & Developer
MONOREPO ENGINE Turborepo + pnpm Workspaces
BACKEND & DATABASE NestJS · PostgreSQL · Prisma
REAL-TIME DISPATCH Socket.IO Rooms + BullMQ

Modern public infrastructure platform engineered inside Turborepo with Next.js 15, NestJS, and PostgreSQL Prisma. Connects citizen geotagged incident reporting with an operator triage console via real-time WebSocket events and automated work order case conversion.

Turborepo Next.js 15 (React 19) NestJS (TypeScript) PostgreSQL / Prisma Socket.IO Event Bus
VIEW SYSTEM BRIEF →