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Engineered e-LegTas using Rapid Application Development (RAD) methodologies to build a multi-platform crisis-operation ecosystem containerized with Docker and deployed across DigitalOcean cloud infrastructure to service a 2nd-class component city of 210,000+ residents. The system integrates an Express backend, a React web app, and a Flutter mobile app to bridge critical spatial data with public safety operations during emergency scenarios.

By deploying real-time data pipelines using Server-Sent Events (SSE) and Redis caching, the platform delivers low-latency tracking of evacuees, resource capacities, and health counters.

The system features context-aware, role-based data isolation layers across multi-agency units, leveraging AWS S3 and IAM user policies for secure, restricted-access asset storage, alongside an automated compliance engine that instantly calculates and exports disaggregated demographic datasets and regulatory XLSX DROMIC reports directly from live fields.

Engineered One Legazpi, a cross-platform mobile application written in Flutter and Dart 3.11 that serves as the citizen-facing system for Legazpi City's unified crisis operations and public service network. The application interfaces cleanly with core backends to bridge critical spatial assets, local government services, and live field operations for 210,000+ residents.

Designed using a feature-first architecture, the platform implements a structured Repository-Service-Notifier pattern utilizing Riverpod for global state lifecycle guards and state management. To handle safety operations, the app integrates MapLibre GL alongside offline map tile assets and geolocator caching to preserve spatial routing layers during connectivity failures. The ecosystem features a secure, claims-based KYC verification flow with multipart document uploads, an asynchronous incident reporting module with localized database persistence (sqflite), and live mass notification delivery powered by Firebase Cloud Messaging device registration.

Engineered a full-stack centralized ecosystem platform for the Philippine market that aggregates startups, job seekers, investors, and community organizations into a single network. The application integrates an Express backend, a React web frontend, and Supabase to drive complex multi-role content lifecycles and seamless data management.

By architecting automated, role-based moderation engines and database schemas validated by Zod, the platform securely drives content CRUD operations, approvals, and archiving workflows for over 300+ startups and multi-tier sub-modules. The system features a custom manual subscription and monetization framework, plan-based visibility metrics, historical audit trails for data compliance, and shared filter infrastructures built for highly performant query pagination.

Engineered AliTapTap, a full-stack e-commerce ecosystem specialized for customizable NFC business cards. The platform coordinates a cross-platform mobile app client engineered with Expo and React Native, a centralized Node.js/Express backend, and a comprehensive web-based administrative analytics dashboard, unifying transactional e-commerce with real-time operations.

The platform features an interactive front and back card customization engine that supports dynamic drag-and-drop mechanics, scaling, and custom raster layout manipulation, capturing print-ready artwork configurations using view-shot pipelines for local state persistence. To streamline checkout fulfillment, the system interfaces directly with PayMongo API endpoints to process secure card, GCash, and GrabPay transactions. Real-time customer-to-seller communication is driven by a duplex Socket.IO implementation featuring bidirectional text and media sharing, while the admin infrastructure leverages data visualization layers and tabular reporting tools to support complex inventory management and financial auditing.

Engineered Titikman PH, a full-stack location-based food spot discovery and store submission platform built to centralize localized food trends for the citizens of Legazpi City, including the viral Dubai chewy cookies and Ilocos empanada crazes. The architecture combines a React web application, an Express backend, and a Supabase Postgres relational database to capture real-time market trends and scale community-driven spatial mapping.

The system utilizes MapLibre GL and React Map GL to deliver an interactive map experience featuring coordinate-pinned store markers, dynamic popups, and automated Google Maps external routing pipelines. To manage crowd-sourced data safely, the platform implements a protected admin moderation dashboard featuring asynchronous store approval/rejection workflows with custom denial reasoning. The backend architecture relies on strict server-side schema validations via Zod to process nested relational datasets, capturing multi-tier entity rules for store operating hours, social media vectors, product order types, and dynamic pricing metrics.