CBLU.net
Available for new projects

Freelance
PHP Developer

I'm Paolo Certo — a PHP developer with over 25 years of experience building robust web applications, e-commerce solutions, and custom CMS platforms.

Contact me View my work
25+
Years of experience
100+
Web sites
12
Web applications
1
CMS
2
SaaS
About me

The developer behind the code

A developer who cares as much about solving the right problem as writing the right code.

Experience

I wrote my first web application in PHP back in October 2000. Over two decades, I've crafted hundreds of thousands of lines of code — and today my approach is cleaner, more structured, and driven by solid Object-Oriented principles within MVC frameworks.

Passion

As Confucius said: "Choose a job you love and you will never have to work a day in your life." Every new project is an intriguing challenge — a new world to explore, new people to meet, new problems to solve. Even the hardest ones are what make this work exciting.

Productivity

Great software starts with clear communication. Before writing a single line of code, I make sure we both understand exactly what we're building and why. When you know where you're going, you don't waste time on the wrong road.

What I do

Services & Expertise

From initial analysis to deployment and beyond — I cover the full lifecycle of web application development.

PHP Development

Custom backend development using PHP 8.x, built on clean MVC architecture with my own battle-tested X3CMS .

Web Applications

Full-featured web applications for any domain: billing platforms, membership systems, data management tools, APIs for mobile apps, and more.

E-Commerce

Custom e-commerce solutions tailored to your business — product management, cart, payment gateway integration, and order workflows.

CMS Websites

Professional websites powered by X3CMS — my own open source Content Management System — giving you full editorial control with no technical knowledge required.

Database Design

Efficient relational database architecture with MySQL — from schema design to complex queries and optimization for high-performance applications.

SaaS Projects

I design, build, and operate my own Software as a Service products — from architecture and backend to frontend and ongoing maintenance, fully managed in production.

Technologies & Tools
Portfolio

Projects & Work

A selection of the work I'm most proud of — from personal open-source projects to client deliverables.

Software as a Service

Products I created and actively run in production

WeekTable

A stress-free weekly schedule builder for schools and teams. WeekTable makes it simple to create and maintain timetables, manage shifts, and share schedules — all from a clean, intuitive interface.

Scheduling Schools & Teams Multi-language
Visit weektable.com
Naratui Naratui

Recurring group appointments, finally simple. Create your group once, set a recurring schedule, and let everyone confirm whether they're in — automatically, with no endless chat threads. A PWA with push notifications, free for all members.

Recurring appointments PWA 6 languages
Visit naratui.com
Last project

SecretSSM

Scuole di Specializzazione in Medicina

A full-featured e-learning platform for medical students preparing for the SSM specialisation entrance exam. Built on X3CMS, it delivers on-demand video courses, a timed exam simulator, digital study manuals, and student progress tracking — serving thousands of students across Italy.

E-learning Exam simulator Video courses Digital manuals X3CMS
Visit study.secretssm.com
🎓
On-demand courses
Video lessons by specialised medical professors
📝
Exam simulator
Timed mock exams that replicate the real SSM test
📚
Digital manuals
Comprehensive study guides free for all registered students
📊
Progress tracking
Personal dashboard to monitor results and study pace
Open Source

X3CMS

My flagship project — a powerful, flexible Content Management System built on top of a MVC framework. After 10+ years of continuous development, it lets me deliver complex web projects in weeks, not months.

PHP 8.x MVC MySQL Multi-language API ready
Visit project

Web Applications

Since 2000, I've delivered web applications across a wide range of industries — from utility billing platforms to company phone management systems, association portals, and much more.

  • Billing & invoicing systems
  • Membership & association portals
  • Telecommunications management
  • RESTful APIs for mobile apps

Websites & E-Commerce

Professional, responsive websites and online stores powered by X3CMS — scalable from a simple brochure site to a full-featured e-commerce platform as your business grows.

  • Corporate & business websites
  • Custom e-commerce solutions
  • Multi-language support
  • SEO-friendly architecture
Open Source CMS

Why I built my own CMS —
and why it matters

As a developer, time is my most precious resource. I needed a single solution flexible enough to meet virtually any client need — from a simple website to a complex, multi-lingual web application with custom APIs.

Off-the-shelf CMSes often lock you into their ecosystem. X3CMS, built on a MVC framework, gives me complete freedom: I can integrate external libraries, connect to remote databases, expose APIs, or add multilingual support — all without starting from scratch.

Learn about X3CMS
Contact

Let's work together

Have a project in mind? I'd love to hear about it. Send me a message and I'll get back to you as soon as possible.

Location
via Piero della Francesca, 31/a
09032 Assemini (CA), Italy
VAT Number
IT 02946200926
Currently available

I'm open to new freelance projects and long-term collaborations. Let's discuss your requirements.

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Your data will only be used to reply to your request and will never be shared.

Privacy Policy

This website is operated by Paolo Certo — CBLU.net. Your privacy is important, and this page explains how the information you provide through the contact form is handled.

The information you submit — your name, email address, and message — will be used solely to respond to your request. It will not be shared with any third party, stored in any database, or used for any other purpose.

  • No marketing. Your contact details will never be added to any mailing list or newsletter without your explicit consent.
  • No sharing. Your data will not be sold, rented, or disclosed to any third party under any circumstances.
  • No retention. Once your enquiry has been handled, your information is not retained beyond what is needed for the correspondence.

For any privacy-related questions, write to paolocerto@gmail.com.