Available for new projects

Claudio Fernandes

Engineer.
Dev.
Maker.

I build systems that work: from frontend to backend, from API integration to process automation. Full Stack by choice, mechatronics engineer by training.

See servicesGet in touch
Claudio Fernandes
> php && python && javascript
automation && systems integration
// online presence

Where to find me

Technical content, open source and conversations about what I am building.

@HeroDjou

Technical content: real projects, automation and development behind the scenes. Straight to the point.

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@herodjou

Project repositories, automation scripts and experiments. Open source whenever possible.

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Claudio Fernandes

I share my career journey, case studies and conversations about development and technical projects.

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@HeroDjou

Short doses of technology, code behind the scenes and automation applied to everyday life.

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herodjou.substack.com

I publish thoughts, stories and behind-the-scenes accounts of my projects.

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@HeroDjou

Articles and reflections on technology, career and perspectives. Longer, in-depth pieces.

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// products

What I build

Hardware and software products I designed and developed.

Live

pqno.app

A link shortener with Link in Bio, QR codes, collections, analytics, a REST API and subscription plans that I built on NoName.

PHPJavaScriptSQLREST APIJWT
See details →
Plugin · WordPress

YouTube-2-Post

WordPress plugin that imports YouTube channel videos, Shorts and live streams as posts, with a player that loads on click, Elementor widgets and video availability checks.

WordPressPHPYouTube APIElementor
See details →
// services

What I do

I offer technical consulting, development and mentoring for hardware and software projects.

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Full Stack Web Development
I develop web applications, REST APIs and projects using WordPress and WooCommerce, with PHP, Python and JavaScript on the backend and HTML, CSS, Bootstrap and jQuery on the frontend.
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Automation & Systems Integration
I identify bottlenecks in data flows, integrate systems such as CRMs and ERPs through APIs, and write scripts to automate internal processes and reduce manual steps.
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IoT & Prototyping
I develop prototypes and MVPs with Arduino, ESP32 and Raspberry Pi, drawing on my mechatronics engineering background to integrate hardware and software.
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Software Engineering & Architecture
I structure scalable projects, optimize MySQL databases, refactor legacy code, resolve production incidents and design the architecture so the system can keep growing.
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Tracking & Martech
I implement tracking with Google Tag Manager, analyze data with Google Analytics, integrate marketing platforms such as RD Station and Mailchimp, and create reports to inform decisions.
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Consulting, Code Review & Mentoring
I audit existing projects, find vulnerabilities, apply security practices, review technical deliveries and turn business requirements into viable technical solutions, and I also offer technical mentoring.
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Cross-platform Development and Integration
I develop web, desktop (Electron.js) and mobile (Apache Cordova) versions from a shared codebase, using the same business logic and retaining access to native APIs.
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Generative AI & Automation
I combine structured automation and generative AI to create processes that scale, remain adaptable and integrate into the development workflow.
~/stack.sh
# main stack   languages=( "PHP" "Python" "JavaScript" "HTML / CSS" "SQL (MySQL)" )   frameworks=( "WordPress / WooCommerce" "Bootstrap" "jQuery" "Electron / Cordova" )   tools=( "Arduino / ESP32" "Raspberry Pi" "Linux / DevOps" "GTM / Analytics / CRM" )   ai_tools=( "GitHub Copilot" "Claude / Claude Code" "Prompt Engineering" )   # echo "ready for the next challenge"
// philosophy

Two worlds. One intersection.

Most people pick one. I work in both, and that is exactly where the value is.

Automation consistently executes what it was designed to handle, but an unforeseen case can stop the process or cause errors that cost money. Generative AI handles language and variation well, but without defined steps, rules, system integrations and a record of what was done, it only talks and does not carry out the process. I combine the structure and consistency of automation with the adaptability of generative AI to build workflows that scale and adjust to each case.

>_
Got a project or a technical challenge?
Tell me how your process works today and what problem you need to solve.
Get in touch →
// cases

Delivered projects

In each project, I explain the problem I solved, the solution I developed and the technologies I used.

WordPressElementorPHPNginx

Copastur SXSW 2026 Microsite

A WordPress and Elementor microsite for Copastur to sell SXSW 2026 travel packages, with a blog and a plugin that creates a page for each ambassador, with UTM parameters in the links to track where visits come from.

See the full case →
>_
Your next project could be here.
I work with teams and founders who build real things.
Talk about the project →
// education

Technical foundation

A solid academic background combined with continuous learning. Because technology does not stop.

Educação formal

2022–2026

Professional Master's in Science, Technology and Management

Unifesp, Federal University of São Paulo

Applied research in Science, Technology and Management. A stricto sensu graduate program focused on scientific methodology and knowledge production.

2019–2023

Bachelor's in Mechatronics Engineering

FIAP, São Paulo, Brazil

Robotics, control and automation, electronics and embedded programming with Arduino and ESP32.

2015–2018

Computer Graphics

SAGA, School of Art, Games and Animation, São Paulo, Brazil

Digital design, 3D modeling, animation, visual composition and interactive media production.

2014–2016

Associate Degree in Systems Analysis and Development

Cruzeiro do Sul University, São Paulo, Brazil

Programming fundamentals, databases, software engineering and web development.

Habilidades técnicas

WordPress & WooCommerce92%
PHP / Backend90%
HTML / CSS / Bootstrap90%
MySQL / Relational Databases88%
JavaScript / Frontend85%
Automation & Systems Integration85%
Python80%
Cross-platform (Cordova / Electron)75%
DevOps / Linux72%
// contact

Let us talk

Got a project or a technical challenge? Let us talk about the problem before we talk about the solution.