Open to new opportunities · Full-Stack Developer

I build production apps and data tools that real businesses run on.

Full-Stack Developer with broad range: complete applications (ERP, e-commerce, management systems), data analytics & BI, AI agents and assistants, automations, and offline-first PWAs. I turn manual operations into software that runs itself and into data-driven decisions. Every project below is a real system — and most have a live demo you can open and explore.

About me

Hi, I'm Emilio Fonseca

EF

Full-Stack Developer, currently working and shipping production software since 2025. I design and build real systems end to end — web apps (ERP, e-commerce, management tools), data & BI, AI agents and automations — and I care about turning manual, repetitive work into software that runs itself.

Comfortable across the stack (React/TypeScript, Node.js, Python/FastAPI, PostgreSQL, Firebase, Docker) and with applied AI. Most of the projects below are live and explorable. Open to remote roles.

Full-Stack AI & Automation Data & BI Remote-friendly
Selected work

Featured projects

A selection of systems I have designed and built end to end. Several are private (business logic), but most have a live, explorable demo — click any card.

Artificial Intelligence & Machine Learning
Web Apps, Business & BI
● Showcase
Smart reporting

Lumen · Ask your numbers

Ask about your sales or finances in plain language — typing or speaking — and get a clear answer instantly, no spreadsheets required. Charts, tables and natural-language reporting over your ERP data.

IA + SQLVozDashboards
View showcase →
● Showcase
BI over WhatsApp

Brújula · Your numbers on WhatsApp

Every sales rep gets their KPIs on WhatsApp twice a day —sales, targets and progress— and at end of day the manager receives a consolidated report. ~56 reps and 110+ automated messages daily, with no one logging into a system.

WhatsApp Business APIAutomated BIScheduled delivery
View showcase →
● Showcase
Business management

Núcleo · Your business in one screen

Organizes your schedule, resources and day-to-day operations in one real-time place, synced with your calendar so no appointment slips through.

ReactFirebaseServerless
View showcase →
● Showcase
Management app

Vértice · A custom-built app

A custom application to manage a team’s internal processes (projects, quotes, payments). Keeps working offline and protects access with secure authentication. React + FastAPI + PostgreSQL + Docker.

ReactFastAPIPostgreSQLDocker
View showcase →
● Demo
Online store

Vitrina · Your online store

A complete, ready-to-sell online store: category catalog, cart with promotions, stock alerts and instant product search. Fully responsive.

ReactViteE-commerce
Explore the store →
● In development
Personal finance app

MyAccountant · Your money, in order

Personal PWA to manage your finances: category budgeting, expense control and real-time tracking. A personal project on React + Firebase (Google Cloud), in active development.

ReactFirebase / Google CloudPWA
🏗️ In development
● Live site
Website · Landing page

Landing page · Audiovisual portfolio

Netflix-style landing page for an audiovisual marketing creative: billboard hero, video catalog with a built-in player, animated hover and full SEO (Open Graph + structured data). Design, frontend and deployment end to end.

HTML · CSS · JSPlyr · VideoSEO + OGResponsive
View site →
Automation & Integrations
Other Projects
Stack

What I build with

Full applications

End-to-end full-stack: ERP, e-commerce, admin dashboards and custom systems.

Data analytics & BI

Dashboards, metrics, reports, trends and KPIs — including conversational BI (ask your data).

AI agents & assistants

Claude and OpenAI: conversational assistants, agents and configurable skill ecosystems.

Automation

Bots and processes that run themselves 24/7: quotes, reports, reminders and API integrations.

PWA & offline-first

Installable web apps that work without internet and sync on their own when reconnected.

Backend & databases

Node.js, Python, FastAPI, PostgreSQL, Firebase and SQL Server.

Frontend

React, TypeScript and modern, accessible, responsive interfaces.

Machine Learning

Reinforcement learning and computer vision (OpenCV).

Integrations

Official WhatsApp Business API, Google Calendar and enterprise systems.

Infrastructure

Docker, deployments and serverless cloud architectures.

Certifications

Verified credentials

Online certifications across development, AI, data and cybersecurity. Click the Coursera ones to verify.

Coursera

Verified certificate · Verify →

Coursera

Verified certificate · Verify →

Coursera

Verified certificate · Verify →

Building My First Video Game

Mastermind · Game development · 2023

Staying Safe Online (Cybersecurity)

Mastermind · Cybersecurity · 2023

Git: From Noob to Pro

Mastermind · Development · 2023

Build Your First FPS Video Game

Mastermind · Game development · 2023

Let's work together

I'm open to Full-Stack Developer / Software Engineer roles (remote-friendly). Happy to walk you through any project or send my CV.

emilio656565@outlook.com · linkedin.com/in/emilio-fonseca65 · github.com/EmilioUgarte65