erzan@Projects\portfolio-v2\apps\web ~

❯

echo"Hi I'm Earl Jan Do! [Erzan] I'm a FullStack Developer, Welcome!"

echo""

I build scalable backend systems & modern web platforms

Full-stack developer specializing in ERP systems, APIs, and developer platforms — focused on performance, clean architecture, and real-world scalability.

View Projects Engineering Docs

Stuff I’m currently building or messing around with 👇

Portfolio revamp (this one)

Ongoing

Personal Docs on Docusaurus (already deployed)

Ongoing

Blog Page section in development and will be self-Hosted CMS with Supabase and Drizzle ORM

Ongoing

Simple dev tools (experimenting)

Queue

Side project — Product Inventory System ERP

Ongoing

Side project — Laravel Projects

Live

Side project — ERP API

Live

Featured Projects

A collection of my work, personal and freelanced projects where I apply and prioritize scalable architectures, clean and readable codes with proper documentaions showcasing my understanding and developer experience about building sustainable applications, api's and systems from local development, with CI/CD to Staging branch for QA and Tester up to Production branch.

ShopStack - Fullstack E-Commerce Application

ShopStack is a full-stack multi-tenant marketplace platform built with modern web technologies.

NestJS

Prisma

PostgreSQL

Docker

Code Demo

Docs Platform

Developer documentation platform using Docusaurus

Docusaurus

TypeScript

React

Code Demo

Livestock Tagging and Profiling Management System

Livestock management system

Laravel

PHP

Blade

Vite

SaaS

Code Demo

QR-Code Attendance Management System

This project are for faculties and students scanning for generated qr code for convenient attendance during events

Laravel

PHP

Blade

Vite

Code Demo

SLSU Clinic Appointment System

This project is intended for the uninersity clinic to be paperless and all the appointments will be made online

Laravel

PHP

Blade

Vite

Code Demo

Portfolio V2

My new and updated personal front facing portfolio website built with React, Next.js, and TailwindCSS

React

NextJS

TypeScript

Tailwind

Code Demo

ERP API

This project is a NestJS Enterprise API Project with subsystems inside a company, it highlights my understanding and experience.

NestJS

PostgreSQL

Swagger

Supabase

Render

Code Demo

ShopStack API

This is the backend service of the ShopStack Fullstack Application deployed using Render.

NestJS

PostgreSQL

Swagger

Supabase

Render

Code Demo

Technical Stack

A collection of different technologies, workflows, tools and engineering principles I utilize to design, maintain and optimize scalable modern Web Applications and API's.

System Architecture

Backend Engineering

Designing scalable APIs, authentication systems, and maintainable backend architectures focused on reliability and performance.

NestJS

PHP

Laravel

CodeIgniter

Node.js

Express

Spring Boot

Interactive UI

Frontend Experience

Building immersive interfaces with responsive design, motion systems, and component-driven development.

React

Next.js

TypeScript

Tailwind CSS

Framer Motion

Deployment Workflow

Infrastructure & DevOps

Managing deployments, automation pipelines, and modern cloud-native development workflows.

Docker

Netlify

Git

Vercel

CI/CD

Render

Data Modeling

Data & Persistence

Designing relational data models, query optimization, caching, and persistence strategies.

PostgreSQL

MySQL

Prisma

Redis

Supabase

Case Study

A closer look into how I approach real-world system design, problem-solving, and scalable application development.

Featured System Project

SLSU Clinic Appointment System

A modernized clinic scheduling platform designed to reduce manual workflows and improve appointment management efficiency.

Repo

Problem

Manual appointment handling caused long queues, inconsistent scheduling, and inefficient patient management.

Solution

Developed a centralized web-based appointment system using Laravel and MySQL to streamline clinic operations and automate booking workflows.

Challenges

Managing concurrent bookings, preventing schedule conflicts, and maintaining reliable database consistency across requests.

Outcome

Reduced administrative workload, improved scheduling efficiency, and delivered a smoother appointment experience for both staff and students.

How I Think

My approach to development focuses on thoughtful architecture, long-term scalability, and building experiences that remain maintainable as products evolve over time.

Scalability First

I design systems that can grow, evolve, and remain maintainable long after the first deployment.

Clean Architecture

Readable structure and long-term maintainability matter more than temporary shortcuts.

Performance Mindset

I constantly look for optimizations, efficient rendering, and better user experience.

Depth Over Trends

I prefer mastering fundamentals and deeply understanding tools instead of chasing every trend.

Testimonies

Kind words from colleagues, coworkers, clients and readers about my work and contributions.

"Earl is a junior developer who brings great enthusiasm to the team. He consistently follows instructions carefully and always checks in with questions or seeks permission before making decisions on the project. This proactive approach makes him reliable—he completes assigned tasks on time and knows his limits, so he reaches out for guidance when needed to avoid mistakes. His willingness to learn and communicate openly is a valuable asset to the team. He is actively learning and improving day‑to‑day, especially in backend development. He’s building solid experience with NestJS, TypeScript, PostgreSQL, Prisma, and authentication systems, and continues to deepen his expertise in these areas."

Julius Brian Canillo

Senior Dev/ ERP • 1 month ago

"I had the opportunity to teach and later work with Earl Jan on several development projects. Early on, he demonstrated strong potential, though he initially lacked the confidence to fully pursue his capabilities in programming. Despite his limited real-world experience at the time, he accepted the challenge and consistently delivered assigned tasks on schedule, requiring only minor revisions. Since then, he has shown significant initiative in strengthening his fundamentals and continuously improving his technical skills. Today, Earl Jan stands out as a driven and capable programmer. His growth, professionalism, and commitment to learning make him a valuable asset to any development team."

Renee Clint Gortifacion

University Instructor • 1 month ago

"Great working with Earl. A dedicated and reliable developer who adapts quickly to new technologies and challenges. I appreciate your commitment to your tasks and your continuous effort to learn and improve. Keep up the good work and continue growing professionally."

Dominic Vega

Software Developer • 1 month ago

Leave a Note

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Contact me if you'd like to leave feedback.