Multiple Demos for You

Explore the projects, technologies, and engineering solutions I've developed throughout my career.

Full-stack developer and Software Engineer with 3+ years of experience in government-funded R&D and startup environments. Specialized in backend systems, REST APIs, IoT communication, and embedded integrations. Contributed to the development of an Underwater Sensor Network System for tsunami detection under the Department of Science and Technology (DOST). Experienced in independently managing and delivering production-grade web applications including e-commerce, logistics systems, and enterprise record platforms.

Strong foundation in system architecture, database design, and real-time communication systems.

Underwater Sensor Network System

Role: Firmware & Full-Stack Developer

Description:
Real-time underwater IoT monitoring system for tsunami detection and sensor telemetry.

Key Contributions

  • Developed the MicroPython receiver firmware.
  • Implemented the LoRa communication bridge.
  • Built the real-time telemetry dashboard.
  • Integrated sensor data with the ground station server.

NexusPro (user: admin | pw: admin)

Role: Lead Full-Stack Developer (Startup Sole Developer)

Description:
Online learning and recruitment platform connecting learners, course creators, and employers.
Note: The app is in login & read-only. No method posts will be executed to prevent malicious modifications.

Engineering Highlights

  • Developed an integrated learning and recruitment platform connecting learners, course creators, and employers.
  • Engineered a course marketplace with instructor monetization and enrollment workflows.
  • Built a skills-based recruitment system enabling employers to discover candidates based on completed courses and assessment performance.
  • Implemented AI-assisted exam proctoring using face detection to flag identity and presence violations during online assessments.

Cart & Tell (user: admin | pw: admin)

Role: Lead Full-Stack Developer (Startup Sole Developer)

Description:
Multi-vendor e-commerce platform with merchant onboarding and secure online shopping.
Note: The app is in login & read-only. No method posts will be executed to prevent malicious modifications.

Engineering Highlights

  • Architected the Xendit payment integration supporting cards and e-wallets.
  • Developed the merchant onboarding and KYC workflow.
  • Implemented webhook-driven payment processing.
  • Built the multi-vendor marketplace from the ground up.

NBS (user: admin | pw: admin)

Role: Lead Full-Stack Developer (Startup Sole Developer)

Description:
Learning management system with course materials, assessments, and rubric-based grading.
Note: The app is in login & read-only. No method posts will be executed to prevent malicious modifications.

Engineering Highlights

  • Engineered a dynamic rubric grading system.
  • Developed paperless document automation.
  • Built bulk user administration.
  • Designed the assessment and submission workflow.

Pamav (user: admin | pw: admin)

Role: Lead Full-Stack Developer (Startup Sole Developer)

Description:
Industrial training platform with digital twin technology for remote equipment operation.
Note: The app is in login & read-only. No method posts will be executed to prevent malicious modifications.

Engineering Highlights

  • Designed the Remote Access Gateway.
  • Implemented digital twin integration.
  • Developed the remote equipment control workflow.
  • Built the training management platform.

Packed withessential features

Laravel Framework

REST API

PostgreSQL

MySQL

Python

Apache

PHP

JavaScript

Analytics

Built on Bootstrap 5

Styled withCSS3

Coded with HTML5

Clean design

Cross-browser tested

SASS Supported

Implemented features

Real-Time Underwater Sensor Network System

Developed the MicroPython receiver firmware, implemented the LoRa-to-server communication bridge, and built the real-time web monitoring platform for a government-funded underwater sensor network.

Integrated Xendit Payment Gateway

Independently architected and implemented the complete Xendit payment integration, including secure checkout, payment verification, webhook processing, and support for credit/debit cards and e-wallets.

Dynamic Rubric Grading System

Developed a dynamic rubric engine that enables instructors to create, modify, and manage custom grading criteria with configurable weighted scoring for flexible performance evaluation.

Paperless Document Automation

Developed pixel-perfect digital replicas of existing paper forms, enabling organizations to transition to a paperless workflow without changing their established documentation process.

Bulk User Management

Developed a bulk user management system that enables administrators to assign roles, apply bulk actions, and manage user access through CSV imports or multi-selection workflows.

Face Detection

Developed AI-assisted exam proctoring using face detection to flag identity and presence violations during online assessments.

Frequently asked questions

Yes. Unless otherwise noted, I independently designed, developed, and maintained these applications as the Lead Full-Stack Developer. For collaborative projects, each project page clearly identifies my specific contributions.

Some projects are production-ready while others are prototype or R&D systems. Live demos use demo accounts and sanitized data to protect client confidentiality.

I primarily build applications using Laravel, PHP, MySQL, PostgreSQL, Apache, Cloudflare, JavaScript, Bootstrap, REST APIs, IoT communication, and third-party integrations including payment gateways.

Most featured projects were developed under commercial employment, startup engagements, or government-funded R&D initiatives. As a result, the source code is proprietary and cannot be publicly distributed. This portfolio focuses on demonstrating the systems I engineered, the technical challenges I solved, and my specific contributions to each project.

Yes. I intentionally worked on both simultaneously to broaden my experience. While contributing to a government-funded R&D project, I also joined a startup as the Lead Full-Stack Developer, where I independently built production-ready systems. It was a deliberate decision to accelerate my growth by gaining experience in both research and commercial software development.

I'm always open to learning new technologies. Although my professional experience has centered around Laravel, PHP, and full-stack web development, I believe strong engineers are defined by their ability to learn, adapt, and solve problems rather than by a single framework. Throughout my career, I've quickly learned new tools and technologies whenever a project required them, and I look forward to doing the same in future roles.
phoenix

guiller

Thank you for reviewing my work. I'm always excited to contribute to meaningful projects, solve challenging problems, and continue growing as a software engineer.

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