“Unafraid to fail — I dive into the unknown, because that's where the real learning happens.”

* Kelvin Nakpil

Fullstack Developer
— ERP Systems Specialist

20+ Systems Shipped

I design and build business-critical software — with a focus on ERP systems — and I'm comfortable owning any layer of the stack: Fullstack, Front End, Backend, Systems Administrator, or Network Administrator. I pick up new technologies fast and adapt to whatever the system needs.

Hire Me Now

* About

Building systems that hold up under real use

Years of shipping business-critical software, end to end.

I've spent the last several years building ERP, healthcare, point-of-sale, payroll, and trading systems for real businesses — usually owning the full stack, sometimes the infrastructure underneath it too. I care about software that still works correctly a year after launch, not just on demo day.

20+ Systems Shipped

9 Tech Domains

45+ Tools & Frameworks

2017 Building Since

* What I Do

Where I fit in

Five roles I can confidently own on day one.

Contact See Tech Stack ↗

Fullstack Developer

Owns a feature end to end — schema, API, and UI.

Front End Developer

React and TypeScript interfaces for business software.

Backend Developer

Spring Boot, Laravel, and Express services and APIs.

Systems Administrator

Hypervisors, VM deployment, hosting, and backups.

Network Administrator

MikroTik, VLANs, VPNs, firewalls, and IDS/IPS.

* How I Work

Development methodologies

I pick the process that fits the project, not the other way around.

Agile

Iterative sprints, continuous client feedback, and working software early — the default for most product and client work where requirements evolve as we go.

V-Model

Sequential design-and-verification phases, each paired with its own test stage — used for ERP and other business-critical systems where requirements are fixed up front and sign-off matters.

* Skills

Headline strengths

What I lean on most, day to day.

View Full Stack

ERP Systems Development

95%

Designing and building business-critical ERP platforms end to end.

Full-Stack Engineering

92%

Java/Spring Boot, PHP/Laravel, Node/Express backends with React/TypeScript frontends.

Infrastructure & Network Administration

88%

Hypervisor virtualization, hosting, Docker, MikroTik, firewalls, and IDS/IPS.

AI-Assisted Delivery

85%

Using Claude, Codex, Gemini, n8n, and local LLMs to move faster without cutting corners.

* Tech Stack

Full catalog

Every tool, framework, and platform currently in rotation.

Backend

Java — Spring Boot / Spring MVC

PHP — Laravel

Node.js — Express

Desktop Applications

JavaFX

Packaged Installers — Windows (.msi / .exe), Linux (.deb), with Auto-Update

Frontend

TypeScript

React

Databases

MySQL

PostgreSQL

MongoDB

Oracle

H2 Database

Scripting & Tools

Python

Lua

Infrastructure & Hosting

Systems Administration

Network Administration

Tier-1 Hypervisor Virtualization — XCP-ng

Virtual Machine Deployment

Web Hosting

Application Hosting

Docker

Cloud Hosting

Network Storage

Open Source Integration & Hardening

Windows & Linux File Systems

Security

Firewall Configuration — pfSense

Suricata

Snort

Intrusion Detection & Prevention (IDS/IPS)

Networking

MikroTik

Network Layers (OSI Model)

VLAN

VPN

Proxy

AI & Automation

n8n Workflow Automation

Ollama

Local LLM Deployment

Claude

Codex

Gemini

Uses AI tooling day-to-day to cut delivery time without cutting corners.

Embedded & Prototyping

Raspberry Pi

Arduino

Single-board computers and microcontrollers for hardware integration and rapid prototyping.

Adapts quickly to new stacks as needed.

* Timeline

Project history

Real milestones, built from actual repository history — 2017 to 2026.

Multi-Company Payroll Desktop Application

2017

// Built a desktop payroll system supporting independent payroll processing across multiple companies.

Timekeeping Desktop Application

2018

// Shipped a desktop application for employee time tracking and attendance management.

Omnicare

2021

// Started building a healthcare management system in PHP.

Shared Foundations

2022

// Built a reusable Java utilities library and a client-facing portal platform.

HRSAM

2023

// Delivered a full Health Record System — backend, React frontend, and beta builds.

Retail & Licensing Systems

2025

// Shipped a Point of Sale platform and a consumer/supplier licensing system.

ERP Base Platform

2025

// Built a reusable core ERP platform and a dedicated health facility ERP.

Trading Platform

2026

// Delivered a trading and transactions platform, backend and frontend.

Slit Lamp & Trade Suite

2026

// Shipped a desktop app for eye-care devices and a trade management suite frontend.

Let's build something reliable

Have a role, a system, or a messy stack that needs an owner? I'm in.

Get In Touch View Projects ↗

* Portfolio

Selected work

A few flagship systems, plus the full project catalog below.

care

Hospital Information System Management — patient records, scheduling, and clinical workflows.

Java // Hospital ERP // Public Repo

Health Facility ERP

ERP system tailored for health facility operations, from intake to billing.

Java // Health Facility ERP // Private

Multi-Company Payroll

Desktop payroll system supporting independent payroll processing across multiple companies.

JavaFX // Payroll System // Private

Inventory and Sales Management System

System for tracking stock levels and managing sales transactions across a retail operation.

Java // Inventory & Sales // Private

Licensing System

Portal for managing consumer and supplier license records, renewals, and compliance.

PHP // Licensing System // Private

More from GitHub

Loading repositories…

View all on GitHub ↗

Private Modules — Access Restricted

Websites & Portals

Restricted Client Portal Private web portal for client account access and service requests.

Restricted Clinic Website Public-facing website for a healthcare clinic, later rebuilt in TypeScript.

Restricted Company Website Frontend marketing site for a software studio.

Health & Clinic Systems

Restricted Healthcare Management System Platform for managing healthcare operations, later rewritten in Java.

Restricted Health Record System Health record management system with a backend and a React-based frontend.

Restricted Patient Appointment System Frontend for scheduling and managing patient appointments.

Restricted Health Facility ERP ERP system tailored for health facility operations.

Restricted Clinic ERP Frontend Frontend for an ERP system used by a healthcare clinic.

Restricted Slit Lamp Desktop App Desktop application supporting slit lamp device workflows for eye care.

Point of Sale

Restricted Point of Sale System Point of sale backend and frontend for retail transactions.

Payroll & Timekeeping

Restricted Multi-Company Payroll Desktop Application Desktop payroll system supporting independent payroll processing across multiple companies.

Restricted Timekeeping Desktop Application Desktop application for employee time tracking and attendance management.

Trading & ERP Platforms

Restricted ERP Base Platform Reusable base ERP platform with shared core modules, backend and frontend.

Restricted Trading Platform Platform for managing trading and transaction workflows.

Restricted Trade Management Suite Frontend for a trade management suite.

Licensing

Restricted Licensing System System for managing consumer and supplier licensing records.

Shared Libraries & Templates

Restricted Shared Utilities Library Internal Java library of utilities reused across projects.

Restricted UI Starter Template Base frontend starter template built on Material UI.

* Contact

Let's talk

Have a role or project in mind? Reach out.

Email Me GitHub Profile

Fullstack Developer— ERP Systems Specialist