Hello
I'm Juan Miguel

Infrastructure & Full Stack Engineer · AI Integration

Complete solutions that run, stay up and protect your data.

Systems and infrastructure generalist with full stack development and production AI integration: AWS, Docker, Python and TypeScript/React.

Technical Lead — over two years as the primary technical owner of a company's systems.

This site is open source — view it on GitHub

Proficient Tech Stack

AWS
Docker
Flask
AI Integration
React
Django
Tailwind CSS
Git

AWS

Production operations: EC2, RDS Aurora, S3, SES, SSM

AWS sustains the infrastructure I operate daily: EC2 accessed through SSM Session Manager (no exposed SSH), a production MySQL database migrated to RDS Aurora, S3, CloudWatch, and SES configured with custom MAIL FROM, DMARC and SPF for an email architecture of ~100k messages per month. 

Also worked with

React Native
Android Studio
Laravel
WordPress
Unity
Godot Engine

React Native

Mobile apps with React and the Expo ecosystem

I’ve used React Native with the Expo ecosystem to build mobile apps, including an offline-first point of sale currently in beta at a real store. 

Design & Media Tools

Adobe Creative Cloud
Figma

Adobe Creative Cloud

Photoshop, Illustrator, Premiere Pro & Audition

With several years of experience in Adobe Creative Cloud, I’ve worked extensively with Photoshop for editing, Illustrator for logo design, Premiere Pro for video editing, and Audition for audio refinement. 

Soft Skills

Prioritization in legacy systems

Breadth with real depth

Security instinct

Understand before implementing

Communication

Technical leadership

Projects & Case Studies

Problem → decision → result. AI here means production systems — inference costs, failure handling, data privacy — not demos.

Verde — Legacy Rescue

Verde — Legacy Rescue

In progress

Rescue of a business-critical legacy system

AWS & Self-hosted Infrastructure

AWS & Self-hosted Infrastructure

A one-person platform team, as a case study

Security Incident Response

Security Incident Response

A real incident, contained and turned into hardening

Oficina Virtual

Oficina Virtual

Grupo Ecoquintas' client portal — Next.js & Python

Live
KaraHero AI

KaraHero AI

In development · 80%

Karaoke studio, powered by local AI models

Habla Bien

Habla Bien

In development

Real-time speech-to-big-text for deaf & low-vision users

Antuan POS

Antuan POS

Beta

React Native offline-first POS

EQ Tickets

EQ Tickets

Next.js & Django

Live
FireLink

FireLink

In development

Cast to Fire TV — Kotlin & WebRTC

WhereToGoCR

WhereToGoCR

In development · 90%

Travel booking platform

Live
Mabaagroexport

Mabaagroexport

A responsive and bilingual website

My old portfolio

My old portfolio

Made with Next.js

About me

Juan Miguel Fernández

Systems and infrastructure generalist with full stack development and AI integration — a platform/DevOps profile that also builds applications. Over two years as the primary technical owner of a company's systems: AWS infrastructure, the rescue of a business-critical legacy system, and AI features built for production, with cost control, failure handling and data privacy. Technical Lead since June 2026. Based in northern Costa Rica, available for hybrid work.

Past

Since the age of 13, amazed by the way elements were designed on the web, I taught myself to create web pages using pure HTML and CSS, and later built some simple applications with Visual Basic. From that moment on, and throughout my university years, I discovered my passion for creating useful and entertaining applications. On one hand, the possibility of creating functional applications for myself, and on the other, bringing my video game and mobile application projects to life.

the kid in the computer with his dogsthe kid in the computer

Present

Today my work is broader than writing code: I am the primary technical owner of a company's systems — infrastructure, DevOps and data operations — promoted to Technical Lead in June 2026. I have migrated a production database to AWS RDS Aurora, stabilized a business-critical legacy system (from a development server to Gunicorn/Nginx with separate dev/prod environments), designed an email architecture that sends ~100k messages per month, operated a self-hosted tool stack with single sign-on, and responded to a real security incident. In parallel, I build systems where AI is a production feature — a karaoke generator with word-level sync, custom MCP servers in TypeScript — with explicit cost and reliability criteria. What a company gets from my work is not just an app: it is a complete solution that runs, stays up and protects its data.

the man in the computerthe man dominating technologiestwo men testing a mobile app

Future

The direction is clear: to go deeper in platform engineering on AWS and production AI integration as my main vertical, and to keep being honest about the stage I am at — about two years of formal experience, with identified gaps (testing culture, peer code review) that I am closing through a documented plan. I am building complete solutions for companies in my region while remaining open to remote teams with senior engineers and a code-review culture, where every project makes me measurably better. The goal is not to accumulate technologies: it is to deliver systems that keep working when nobody is watching.

the man thinkingthe man with the cyber girlthe man presenting the statistics