PHILIPPINES / REMOTE · WEB SYSTEMS

ZENDRICK
GANGO

FULL-STACK SYSTEMS DEVELOPER

"I build operational software — systems that businesses and organizations actually run on."

Engineering complete web platforms spanning healthcare domain architectures, Philippine tax compliance engines with pessimistic locking, multi-branch access control, and distributed civic systems.

VIEW SELECTED WORK DIRECT CONTACT
CORE STACK / PHP · LARAVEL · TYPESCRIPT · NESTJS · MYSQL · POSTGRESQL
01 / SELECTED WORK

Operational Software & Architecture

Four enterprise systems engineered for real transactions, mission-critical operations, 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 bloated 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 Twilio / Semaphore SMS
VIEW SYSTEM BRIEF → LOAD ON WORKSTATION →
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+ Shopee Open API v2 lockForUpdate() 12% VAT Engine ESC/POS Thermal Protocol
VIEW SYSTEM BRIEF → LOAD ON WORKSTATION →
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 Multi-Branch RBAC
VIEW SYSTEM BRIEF → LOAD ON WORKSTATION →
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 Redis BullMQ
VIEW SYSTEM BRIEF → LOAD ON WORKSTATION →
02 / SYSTEMS INVENTORY

Comprehensive System Portfolio

Beyond the four flagships, eight complete production and institutional platforms span transactional ticketing, live tournament broadcasting, corporate asset management, and air-gapped CMS workflows.

SYS / 05 · TICKETING COMPLETE

PrimeTix

Interactive 6-tier SVG arena seating reservation engine with transactional hold leases and cryptographic QR code generation.

PHP (PDO) MySQL Seat Lock Lease
SYS / 06 · LIVE BROADCAST PRODUCTION

MLBB Tournament System

Esports competition platform powering double-elimination brackets, synchronized hero pick/ban drafts, and dynamic OBS Studio broadcast overlays.

TypeScript WebSockets OBS Studio
SYS / 07 · INSTITUTIONAL COMPLETE

Prowlway

Corporate CMS with dual perimeter boundary separating public informational viewports from air-gapped staff publication review queues.

Modular PHP MySQL Audit Logs
SYS / 08 · INDUSTRIAL COMPLETE

Core Lift

Heavy industrial machinery catalog portal with dynamic multi-attribute specifications tables, PDF brochures, and quotation routing.

PHP (PDO) Tailwind CSS Lead Routing
EXPLORE FULL ARCHIVE & SYSTEM REGISTRY (8 SYSTEMS) →
03 / METHODOLOGY

How I Build Systems

A disciplined, 7-stage engineering methodology grounded in domain boundaries, concurrency controls, and operational testing.

01
DISCOVER
Bottlenecks & Concurrency
02
MODEL
Relational Schemas & ACID
03
ARCHITECT
Layering & Decoupling
04
BUILD
Clean Logic & Types
05
INTEGRATE
APIs & Hardware Bridges
06
TEST
Edge Cases & Concurrency
07
DEPLOY
Live Production Monitoring
VIEW ARCHITECTURAL METHODOLOGY WITH CODE SNIPPETS →
04 / CONTACT

LET'S BUILD SOMETHING USEFUL.

Available for enterprise full-stack development, operational software architecture, custom ERP/CRM engines, and systems consulting.

EMAIL DIRECTLY WHATSAPP (+63 994 019 7177) VIBER (+63 994 019 7177)
PHILIPPINES (UTC+8) · REMOTE WORLDWIDE