About Me — Jonathan Fontes

Hi, I'm Jonathan Fontes — a Full Stack Developer and Security Specialist based in Espinho, Aveiro, Portugal. I've been working professionally in web development since 2009, and I’m passionate about everything from clean code and performance optimization to open-source collaboration and cybersecurity.

Over the years, I’ve built, maintained, and optimized a wide range of digital products, working closely with both startups and large corporations. I love solving problems with code, especially when applying Test-Driven Development and best practices that make systems more secure and scalable.

My Current Role

Right now, I work at Creative Code Solutions LDA, where I’ve been part of the team since 2018. During my time here, I’ve had the opportunity to lead and contribute to several high-impact projects, including:

• lojadecruzeiros.pt
• nutry4all.com
• predictable.pt
• topatlantico.pt
• geostar.pt

These are just a few highlights — I’ve also worked on large-scale corporate platforms like Sporski.com and Top Atlântico.

Where I’ve Been

Caetsu Advertising Agency (2017–2018)

Some of the projects I contributed to include:

• 50anos.toyota.pt
• saborista.pt
• sumolcompal.pt
• congressofarmaceuticosmz.com
• forumfuturo.pt

Monday Interactive Marketing (2014–2017)

I developed and maintained the Promofans platform and created Junbi, a hybrid hardware/software project for QR code coupon redemption.

Netviagens.com (2013–2014)

Worked as a backend developer in Lisbon.

Freelance Developer (2013)

Developed various websites and web tools for business clients.

Mugnetic Tools LDA (2009–2012)

Worked on Profebox, a digital tool for teachers. I handled everything from development to performance optimization, and even implemented LaTeX rendering on the server side.

What I Bring

• Deep experience with PHP (since version 5.3.29)
• Proficiency with Go, MySQL, and JavaScript-based stacks
• Passion for Open Source and Test-Driven Development
• Strong focus on Security, Scalability, and Performance

Languages I Speak

• 🇵🇹 Portuguese – Native
• 🇬🇧 English – Professional working
• 🇪🇸 Spanish – Professional working

Connect with Me

• LinkedIn
• X.com (old Twitter)
• Github.com.

Hope you will find some useful around here!