Publication
Developer’s Guide to Open Source Licenses
https://www.toptal.com/developers/open-source/developers-guide-to-open-source-licenses
David is available for hire
Hire DavidDavid Marín
Verified Expert in Engineering
PHP Developer
Cobeña, Spain
Toptal member since July 2, 2015
Bio
David is an open-source and open-data enthusiast with more than 26 years of experience as a professional developer. He has acquired various skills, including web programming (PHP and JavaScript), C and C++ (on Linux and Windows), and systems management. Of these skills, David specializes in web programming and has full-stack experience with Symfony PHP-based back ends, jQuery front ends, and WordPress and WooCommerce sites.
Portfolio
DaveFX
React, PostgreSQL, Docker, Claude Code, AI-assisted Development, WebSockets...
Dark House Development
WordPress, Zapier, APIs, WooCommerce, WooCommerce Database...
Fundación MAIOR
WordPress Plugins, Web Hosting & Domain Setup, WooCommerce, Debian, PHP...
Experience
- PHP - 20 years
- MySQL - 15 years
- JavaScript - 12 years
- jQuery - 6 years
- WordPress - 5 years
- Symfony - 4 years
- HTML5 - 4 years
- WooCommerce - 3 years
Work Experience
Founder & Lead Developer
2024 - PRESENT
DaveFX
- Architected and shipped multiple production products through AI-assisted development (Claude Code), acting as architect and product owner, and reviewing every line shipped.
- Launched Habeas, an open-source Manifest V3 browser extension for Chrome and Firefox that recovers personal data from 24 services with no API, via declarative YAML adapters.
- Implemented Habeas cloud sync over Google Drive, Dropbox (PKCE), WebDAV, and S3 with a custom SigV4 signer, keeping all data under the user's control.
- Built Cuéntamo, a privacy-first personal finance and freelancer accounting SaaS (Symfony 7, API Platform, React 18, TypeScript, and PostgreSQL 16) with a Spanish tax module and Stripe billing.
- Deployed Cuéntamo with Docker Compose and Caddy on a Hetzner VPS, with AES-256-GCM encryption of sensitive fields and self-hosted Umami analytics.
- Developed Tiquetera, a Symfony/PostgreSQL app that scans Gmail via OAuth2 for digital receipts, parses them from PDF, and delivers spending analytics.
- Built Clipboardwire, a cross-device clipboard sync tool for Linux (Wayland) and Windows over WebSocket, with its own architecture and security model.
- Created Laudanza, an offline-first PWA and Android app for songbooks with lyrics and chords, built with Vite, React, TypeScript, and i18next.
- Published freemium WordPress and WooCommerce plugins on WordPress.org with Freemius premium tiers, including Coupon Audit & Analytics and LeanRoles.
Technologies: React, PostgreSQL, Docker, Claude Code, AI-assisted Development, WebSockets, Stripe, Symfony, TypeScript, API Platforms, Browsers, Gmail API, Tailwind CSS, Progressive Web Applications (PWAs), WordPress, System Administration, Gutenberg Editor
Freelance Back-end Specialist
2020 - PRESENT
Dark House Development
- Worked on the back-end side for several web projects where I linked several services using their APIs, including Salesforce and Zapier.
- Fixed several problems with WooCommerce Subscriptions.
- Implemented custom plugins for several projects, mainly based on the back end.
Technologies: WordPress, Zapier, APIs, WooCommerce, WooCommerce Database, WooCommerce Subscriptions 2, WordPress API, WordPress REST API, WordPress LMS, WordPress Plugins, Salesforce API, Domain DNS Setup
Pro-bono System Manager | Web Developer
2003 - PRESENT
Fundación MAIOR
- Managed a network of five Windows computers and a Linux file and mail server remotely.
- Developed and deployed www.maior.es using WordPress and WooCommerce.
- Developed and deployed www.amaysirve.es using WordPress and developed a template from scratch using Twig and Timber plugin.
Technologies: WordPress Plugins, Web Hosting & Domain Setup, WooCommerce, Debian, PHP, WordPress, CSS, Domains & Hosting, Full-stack Development, Web Development, User Experience (UX), Software Architecture, DNS Configuration, Domain Migration, Domain DNS Setup, System Administration
Lead Full-stack Developer
2024 - 2026
Share.One
- Developed CATCH from the ground up as sole developer, taking the video-testimonial product from prototype to production in close collaboration with the founder.
- Built the embeddable JavaScript and CSS widget loaded on client websites, with a Gulp build pipeline generating per-client configuration and a one-line install snippet.
- Evaluated video-hosting platforms against the product's constraints and licensing terms, and implemented the Vimeo API integration accordingly.
- Built the Symfony/EasyAdmin back office covering client accounts, users and permissions, video library, playlists, and widget configuration.
- Added a "Wall of Love" testimonial grid and configurable client landing pages with embedded Calendly booking.
- Built the usage analytics subsystem end-to-end: event collection endpoint, storage, IP-to-country resolution, and a dashboard with playback and engagement charts.
- Wrote complete technical documentation of the front end and back end to support the rebuild of the platform on a new stack.
Technologies: JavaScript, HTML, CSS, MySQL, PHP, WordPress, Symfony, EasyAdmin, Vimeo API, Gulp, Data Visualization, Technical Documentation, System Administration, Gutenberg Editor
Web Lead Developer
2016 - 2024
The Healthy Mummy
- Developed multiple custom features for the company website based on WordPress and WooCommerce.
- Cleaned and optimized legacy source code to adapt it to the usage of good practices.
- Developed multiple patches and improvements for several existing WordPress and WooCommerce plugins.
- Implemented an automated test suite with Selenium to track the working conditions of the site.
- Debugged and supported a variety of hosting problems.
- Led a team of three developers working on the site's front and back ends.
- Contributed to VWO tests to improve site conversions.
- Led the effort to carry out the needed adaptations to migrate the sites from PHP 5 to PHP 7 and from PHP 7 to PHP 8.1.
- Adapted all customizations to use the new WooCommerce High-Performance Order Storage (HPOS) database schema.
Technologies: JavaScript, WordPress Plugins, Web Hosting & Domain Setup, Docker, Selenium, MySQL, PHP, WooCommerce Subscriptions 2, WordPress, WooCommerce, CSS, APIs, WordPress API, Marketo, ACF PRO, Advanced Custom Fields (ACF), AffiliateWP, Amazon S3 (AWS S3), Amazon Web Services (AWS), Apache, Amazon EC2, Ajax, Klaviyo, BrainTree, PayPal, Domains & Hosting, Ubuntu, PHP 7, Linux Server Administration, Full-stack Development, Integration, Libcurl, eCommerce, Marketplaces, User Interface (UI), Web Development, Stripe API, Stripe Connect, Back-end Development, REST APIs, Cloudflare, WordPress Themes, Architecture, Leadership, Figma, Affiliate Marketing, User Experience (UX), Client Portals, Dashboard Design, Stripe Marketplace, Technical Architecture, API Integration, Data Engineering, Software Architecture, Technical Leadership, Payment Processing, Stripe Payments, Content Delivery Networks (CDN), Search Engine Optimization (SEO), Responsive Web Design (RWD), Load Time, Performance, Web Performance Optimization (WPO), Website Performance, Online Payments, Pixel Perfect, Google Cloud Platform (GCP), Code Review, SEO Tools, Site Speed Optimization, Amazon CloudFront CDN, Web Marketing, Google Analytics, DNS, DNS Configuration, Email Delivery, Domain Migration, Domain DNS Setup, Ad Optimization, WordPress SEO, System Administration, Gravity Forms, Gutenberg Editor
Web Developer and System Administrator
2015 - 2023
Navigate Oceania
- Fixed problems in a multi-domain site where the content should be replicated on all the sites.
- Fixed a hacked WordPress installation and improved the site security.
- Added space for advertisements on all the site pages.
- Fixed problems with the translation plugin on the site.
- Updated and cleaned up the plugins used on the site, as many of them weren't needed.
- Migrated several sites from PHP 5 to PHP 7, and later from PHP 7 to PHP 8, and made the needed adaptations.
Technologies: WooCommerce, JavaScript, WordPress Plugins, Web Hosting & Domain Setup, PHP, WordPress, Domains & Hosting, PHP 7, Full-stack Development, Web Development, User Experience (UX), DNS, DNS Configuration, Domain DNS Setup, System Administration
Freelance Website Developer
2020 - 2021
Punch Buggy
- Built a custom WooCommerce plugin to connect one site against the AmWin stock management system for a motorbike-shop site.
- Used the WooCommmerce Composite Products plugin and built a customized system to build lures from many pieces. The interface included a preview of the generated lure based on the user's selections. This was for a fishing-apparel shop eCommerce site.
- Built a system to manage shipments from scratch for an important furniture marketplace site built using CraftCMS, using Shippit to centralize shipments. The system calculated exact costs and estimated shipment durations.
- Created the back end used by vendors to totally manage their part orders for a marketplace site.
- Implemented several pages on the CraftCMS site, following mockups provided by the designer.
Technologies: PHP, WordPress, WooCommerce, WooCommerce Subscriptions 2, Craft CMS, Web Development, Back-end Development, REST APIs, User Experience (UX), Client Portals, Dashboard Design, API Integration, DNS Configuration
Woocommerce Developer | Payment Gateway Specialist
2020 - 2020
Belfort Design Agency
- Developed from scratch a new payment gateway for WooCommerce to receive payments using Stripe Wire Transfer API.
- Enabled the plugin orders as fully paid once the corresponding payments were received correctly.
- Assisted with the site launch and fixed some problems related to the theme and general WordPress/WooCommerce configurations.
Technologies: WordPress, WooCommerce, Payment APIs, Braintree API, Web Development, Stripe API, Stripe Checkout, Back-end Development, REST APIs, User Experience (UX), Client Portals, API Integration, Stripe Payments, Online Payments, Pixel Perfect, DNS, DNS Configuration, Domain DNS Setup
Developer
2020 - 2020
Waterin Whole Limited dba Our Natural Environment
- Developed a PDF Generator system that transforms a crafted HTML document into PDF format using wkhtmltopdf.
- Enabled the system to retrieve the data for the different documents using calls to an existing API through Libcurl.
- Implemented the system as a web service in PHP 7.
Technologies: Web, PDF, wkhtmltopdf, HTML, CSS, PHP, Libcurl, Domains & Hosting, Back-end Development, REST APIs, User Experience (UX)
Web Developer
2016 - 2016
Adapt Marketing
- Corrected several problems using WordPress API due to an attack on the server.
- Set up a web page using WordPress and WooCommerce, including selecting and adding plugins and generating custom plugins for specific features.
- Migrated Photoshop designs to HTML/CSS using a newly developed WordPress theme.
Technologies: WordPress Plugins, Web Hosting & Domain Setup, Linux, WooCommerce, WordPress, CSS, Domains & Hosting, Full-stack Development, Integration, eCommerce, Web Development, WordPress Themes, User Experience (UX), WordPress Design, DNS, DNS Configuration
Web Developer
2016 - 2016
Meridix Creative, Inc.
- Modified a website so it now uses Stripe payment gateway instead of PayPal's Payflow API.
- Altered the style of several pages on the website.
- Detected several security-related issues and started tasks to solve them.
Technologies: JavaScript, Web Hosting & Domain Setup, Stripe, Microsoft SQL Server, Azure, PHP, Domains & Hosting, Full-stack Development, Integration, Web Development, Stripe API, Stripe Checkout, REST APIs, Stripe Subscriptions, User Experience (UX), Payment Processing, Stripe Payments
Web Developer
2015 - 2016
Forelock
- Adapted the site to use the Braintree payment gateway.
- Worked on security clean-up for the whole site, removing several security issues as potential SQL injection points.
- Developed new features involving back-end and front-end modifications.
- Worked on a different project, implementing a PHP-based API server to be consumed by the JumpOff mobile app.
Technologies: JavaScript, Web Hosting & Domain Setup, HTML, MySQL, PHP, Domains & Hosting, Integration, Web Development, REST APIs, User Experience (UX), API Integration, DNS Configuration, Domain Migration, Domain DNS Setup
Software Developer | System Manager
2006 - 2016
SICE
- Led a team of four to develop and deploy a proprietary reporting system for Canal de Isabel II, Madrid's public drinking water supplier.
- Managed a three-person team to develop and deploy SICE Nautilus, a web-based operational assistance system that includes incident support and fleet, inventory, and maintenance management.
- Optimized queries and made back-end improvements for a web-based report system for SICE's ITS solution. The improvements allowed the generation and exporting of reports involving huge quantities of data to PDF or Excel.
- Worked on the water control system for the Segura Basin. Analyzed, designed, and implemented new features for the Basin Control Center, including interfacing with an automatic telephone service, C++, Aspen InfoPlus.21, SCADA, and an Oracle database.
- Analyzed, designed, and implemented an automated calculation system using Java and ANTLR tool and other Java modules for the back end of a SCADA system for the auscultation of a dam against a MySQL DB. Deployed in Ebro Basin and dams control systems.
- Developed new features for the Basin Control Center of the Tagus Basin. Deployed the new communication system and network of over 200 embedded x86-based Linux remote units. Built remote administration and updated features for these remote units.
- Created automatic ventilation algorithms for the tunnel control system of Madrid Calle-30. Worked on RCU remote control systems, focusing on ventilation and fire detection subsystems.
- Developed features aimed at improving the scalability and robustness of the remote control unit to support a larger number of I/O signals and connections (C++ for embedded Linux system using x86 arch). This was for the In Madrid Calle 30 project.
- Deployed and managed internal Linux and Windows servers (CVS, SVN, Git) for the development department.
Technologies: ANTLR, SCADA, Highcharts, DataTables, NHibernate, ASP.NET MVC, Git, Subversion (SVN), CVS, Linux, Infoplus WMS, Microsoft SQL Server, MySQL, Oracle, PostgreSQL, Java, C++, C, Leaflet, jQuery, Symfony, JavaScript, PHP, Debian Linux, Ubuntu, Symfony 2, Linux Server Administration, Full-stack Development, Web Development, Architecture, Leadership, Dashboard Design, Technical Architecture, Software Architecture, Technical Leadership, Learning Management Systems (LMS), Drupal, Mobile Development, Responsive Web Design (RWD), Technical Writing, Email, System Administration
Web Developer and Technical Consultant
2010 - 2012
Miguel Buckenmeyer & Co.
- Created, installed, and managed several WordPress sites.
- Integrated a web-based file manager in a PHP custom site and helped solve problems in it due to using Java-based plugins.
- Provided technical assistance for different projects.
- Customized an advanced WordPress template, implementing a grid design for the articles.
- Tweaked a PHP-based website for a Spanish perfume company, solving some problems and programming some new features.
Technologies: WooCommerce, Web Hosting & Domain Setup, CSS, HTML, WordPress, PHP, Linux Server Administration, Full-stack Development, Web Development, WordPress Themes, User Experience (UX), Learning Management Systems (LMS), CTO, WordPress Design, DNS, DNS Configuration, Email Delivery, Domain Migration, Domain DNS Setup
Manager of Version Control Systems | C++ Developer
2005 - 2006
Entelgy
- Led the integration management effort for all Movistar prepayment projects (Spain and Latin America) and the administration of several Linux and Solaris CVS servers.
- Contributed to the implementation of new features for the Movistar Spain prepayment project. This involved C++ multi-architecture development and an extensive use of C++ templates.
- Managed configuration integration systems and servers for the project.
Technologies: C++, CVS, Debian Linux, Ubuntu, Linux Server Administration, System Administration
Web Developer | Project Leader | Systems | Database Manager.
2003 - 2005
Desarrollo y Recursos
- Contributed to the administration, automation, and modernization of web (Apache+MySQL+PHP) and mail servers (Sendmail + Dovecot). Helped define policies for security, configuration management, development, and backups.
- Developed a custom workflow and file management system for San Carlos Clinic Hospital (Madrid, Spain) using PHP for web programming and FDF for printable/electronic forms.
- Designed and implemented an online showcase for Diputación de Jaén.
- Analyzed, designed, and implemented customized services for www.iea.es.
- Worked on the analysis, design, and implementation of a service for getting optimal routes between museums.
Technologies: JavaScript, Web Hosting & Domain Setup, Dovecot, Apache, Sendmail, Debian, PHP, Debian Linux, Linux Server Administration, Full-stack Development, Integration, PDF, Web Development, REST APIs, User Experience (UX), Email, Web Content Accessibility Guidelines (WCAG), DNS, DNS Configuration, Email Delivery, Domain Migration, Domain DNS Setup, System Administration
Co-owner | System Manager | Software Developer
2000 - 2003
Advanced Software Production Line
- Helped install, manage, support, and boost security in Debian GNU/Linux servers and firewalls for small and medium enterprise environments.
- Managed projects and analyzed, designed, and implemented AF-Architecture, a multi-tier modular architecture for enterprise software development under GPL open license. The project web page was programmed using a PHP-based app, TYPO3.
- Analyzed, designed, and implemented a CMS system for the firm web page (www.aspl.es) using PHP.
Technologies: Web Hosting & Domain Setup, C, Debian Linux, Linux Server Administration, Web Development, Technical Architecture, Software Architecture, Learning Management Systems (LMS), CTO, Email, DNS, DNS Configuration, Email Delivery, Domain Migration, Domain DNS Setup, System Administration
Project History
Cuéntamo: Privacy-first Personal Finance and Freelancer Accounting
https://cuentamo.comA privacy-first personal finance and freelancer accounting web app for Spanish households and self-employed professionals. It combines household budgeting, cash-flow forecasting, investments (FIFO), multi-currency support, and a Spanish tax module (VAT, IRPF, and record books) in a single tool. No user data is ever sold or monetized. It was built through AI-assisted development, with me as architect and product owner.
Stack: Symfony 7, API Platform, React 18, TypeScript, Tailwind CSS, and PostgreSQL 16, deployed with Docker Compose and Caddy on a Hetzner VPS, with Stripe billing and AES-256-GCM encryption of sensitive fields.
Stack: Symfony 7, API Platform, React 18, TypeScript, Tailwind CSS, and PostgreSQL 16, deployed with Docker Compose and Caddy on a Hetzner VPS, with Stripe billing and AES-256-GCM encryption of sensitive fields.
The Healthy Mummy Websites
A set of websites based on WordPress and WooCommerce, including one main eCommerce site with millions of orders and thousands of active users. Working on this project for more than seven years, I've been the lead developer for these sites.
I started the project cleaning and optimizing lots of legacy code that made the page slow, setting the usage of good practices. We achieved the speed targets.
I also developed multiple custom features to comply with marketing team requirements and multiple patches and improvements for WordPress core and several existing WordPress and WooCommerce plugins.
I developed several custom reports, implemented using low-level complex SQL queries.
I implemented an automated test suite with Selenium to track the working conditions of the site.
I debugged and supported a variety of hosting problems, successfully identifying several bottlenecks in the code.
I led the effort to carry out the needed adaptations to migrate the sites from PHP 5 to PHP 7 and then to PHP 8.1
I adapted the whole set of customizations to use the new WooCommerce HPOS database schema (High-Performance Order Storage).
I successfully migrated the site among several hosting platforms with minimum downtime.
I started the project cleaning and optimizing lots of legacy code that made the page slow, setting the usage of good practices. We achieved the speed targets.
I also developed multiple custom features to comply with marketing team requirements and multiple patches and improvements for WordPress core and several existing WordPress and WooCommerce plugins.
I developed several custom reports, implemented using low-level complex SQL queries.
I implemented an automated test suite with Selenium to track the working conditions of the site.
I debugged and supported a variety of hosting problems, successfully identifying several bottlenecks in the code.
I led the effort to carry out the needed adaptations to migrate the sites from PHP 5 to PHP 7 and then to PHP 8.1
I adapted the whole set of customizations to use the new WooCommerce HPOS database schema (High-Performance Order Storage).
I successfully migrated the site among several hosting platforms with minimum downtime.
Habeas: Personal Data Recovery Browser Extension
https://habeas.devAn open-source browser extension that recovers personal data from services that lock it behind non-automatable walls, with no API and no export. It runs within the user's authenticated browser session, stores no credentials, and uses no intermediary servers, thereby sidestepping anti-bot systems by design. Declarative YAML adapters cover 24 sources across banking, retail, tolls, and investments, and data syncs to the user's choice of Google Drive, Dropbox, WebDAV, or S3. It was published on the Chrome Web Store and Firefox Add-ons and built through AI-assisted development, with me as architect and product owner.
1Place
http://www.1place.com.auI developed the shipping subsystem for this marketplace site based on CraftCMS, developing a plugin to allow the calculation of shipping prices and estimated time lengths using the external Shippit API services.
I also developed the back end for vendors for this site so that they can keep track of orders and past orders. They can also manage the corresponding shipments, sending the corresponding e-mail messages to final customers.
I also developed the back end for vendors for this site so that they can keep track of orders and past orders. They can also manage the corresponding shipments, sending the corresponding e-mail messages to final customers.
Ama y Sirve
https://www.amaysirve.esThe design and implementation of the website for this periodical bulletin, using WordPress, IssueM, and other plugins. Using a responsive theme, the site was designed from scratch using Twig and Timber, and a specific theme template was implemented for sending overviews of just-released issues using email marketing tools.
Linux Audit and Monitoring System
I developed a Linux audit and monitoring system for a startup based on a pre-loaded library and PAM module that captured all the executed commands and their generated output and sent them to an API for later consumption.
Hyperbaric Store
https://hyperbaricstore.comI developed a whole eCommerce website using WordPress and WooCommerce with other plugins.
I built a new theme translating Photoshop mockups into the corresponding HTML, CSS, and JavaScript routines.
I built a new theme translating Photoshop mockups into the corresponding HTML, CSS, and JavaScript routines.
Reporting System for Canal de Isabel II
https://www.sice.com/en/relevant-projects/real-time-monitoring-of-the-quality-of-water-entering-and-leaving-42-wwtps-minerva-project-phase-ii/A new report generation system for Canal de Isabel II, Madrid, Spain's main public water supplier.
I used C#, ASP.NET, the MVC framework, NHibernate, and Microsoft Excel for the back end. For the front end, I used a single Sage application with React and Bootstrap.
I used C#, ASP.NET, the MVC framework, NHibernate, and Microsoft Excel for the back end. For the front end, I used a single Sage application with React and Bootstrap.
Nautilus: Web-based Operational Assistance System
I was the main designer and developer of this modular web system that provides all needed features for supporting infrastructure operation and exploitation: event and incident management, fleet management, stock control, preventive and corrective maintenance, and shift management and works management. Different modules can be installed based on the requirements of each project.
SIDERA Reports: Web-based Reporting System for SICE's ITS Solution
https://www.sice.com/en/sidera-its-tunnels-2/A web-based report system for SICE's ITS solution. I acted as the main designer and developer of this solution. It provides several reports related to traffic management that are shown on the web or can be exported to Excel or PDF formats.
Fundación MAIOR Website
http://www.maior.esA web page for an NGO using WordPress with several plugins and WooCommerce for the online shop.
To keep some information, I made adaptations and customizations of a purchased theme and several custom post types.
To keep some information, I made adaptations and customizations of a purchased theme and several custom post types.
GnoMint: Open-source Tool for the Management of an X.509 Certification Authority
https://github.com/davefx/gnomintI was the project leader and main developer.
GnoMint is a tool for easily creating and managing certification authorities. It provides fancy visualization of all the information pertaining to a CA, such as x509 certificates, CSRs, and CRLs. GnoMint is currently capable of managing a CA that emits certificates that can authenticate people or machines in VPNs (IPSec or other protocols), secure HTTP communications with SSL/TLS, authenticate and cipher HTTP communications through Web-client certificates, and sign or crypt email messages. It's programmed in C using GTK+, SQLite, and GnuTLS libraries.
The project was created as the final-year project of my master's degree in computer science engineering.
GnoMint is a tool for easily creating and managing certification authorities. It provides fancy visualization of all the information pertaining to a CA, such as x509 certificates, CSRs, and CRLs. GnoMint is currently capable of managing a CA that emits certificates that can authenticate people or machines in VPNs (IPSec or other protocols), secure HTTP communications with SSL/TLS, authenticate and cipher HTTP communications through Web-client certificates, and sign or crypt email messages. It's programmed in C using GTK+, SQLite, and GnuTLS libraries.
The project was created as the final-year project of my master's degree in computer science engineering.
Kelly Doe Studio Website
A website based on WordPress software. The website was mainly based on pictures of designs made by the studio. The base template was totally transformed, so the main page showed a very different grid-based layout for the main page.
Calculation Engine for Damdata: Dam Auscultation SCADA
https://www.ofiteco.com/lineas-de-negocio/presas-embalses/aplicacion-damdataThe design and full implementation of a calculation engine programmed in Java for DamData: Ofiteco's specialized dam auscultation SCADA. The formulas are expressed in a formula definition language that is defined formally through lexical and syntax grammar. These formulas are compiled into grammar trees through compiler classes generated using ANTLR. The formulas are invoked by the SCADA and allow different calculations using current and historical data.
Madrid Calle-30 Urban Tunnels
https://www.sice.com/en/relevant-projects/madrid-calle-30-3/In the context of the construction of Madrid Calle-30 tunnels (a 47 km urban tunnel network) and the development of its control system, I was responsible for analyzing, designing, and developing the ventilation algorithms for activating and controlling the different fans and ventilation-related equipment in the tunnels, following the guidelines marked by experts in the field.
I also worked on improving the scalability and robustness of SICE's RCUs (Linux-embedded systems based on x86 architecture) so that they could manage and control more than 9,000 analog and digital inputs and outputs.
I also worked on improving the scalability and robustness of SICE's RCUs (Linux-embedded systems based on x86 architecture) so that they could manage and control more than 9,000 analog and digital inputs and outputs.
Employee Portal for Hospital Clínico San Carlos (Madrid)
The system allows employees to start different procedures (asking for vacation, notifying of changes in a family situation, taxes, etc.) that involve several steps of bureaucracy. In every step, the assigned group of people is notified about the pending actions, allowing them to interact with the application.
I used PHP and MySQL in the server and PDF and FDF for the forms.
I used PHP and MySQL in the server and PDF and FDF for the forms.
Routing Calculator for Huexpo.net
Amidst the development of an institutional website for the different museums in the province of Huesca (Spain), I developed a routing engine for calculating optimal routes for visiting the different selected museums. Based on the traveler's algorithm, the different routes were pre-calculated to ensure a fast response to the user.
CATCH by Share.One: Embeddable Video-testimonial Platform
https://share.oneA video-testimonial product that businesses embed on their websites, built for Share.One. As sole developer, I took it from prototype to production: an embeddable JavaScript and CSS widget with a Gulp build pipeline, a Symfony and EasyAdmin back office for accounts, videos, playlists, and widget configuration, a Vimeo integration, "Wall of Love" testimonial grids, client landing pages with Calendly booking, and an end-to-end analytics dashboard with playback, geographic, and engagement charts.
Clipboardwire: Cross-device Clipboard Sync for Linux, MacOS and Windows
https://github.com/davefx/clipboardwireA cross-device clipboard synchronization tool for Linux (Wayland), macOS, and Windows, communicating over WebSocket, with its own architecture and security model designed to keep clipboard contents private between the user's own devices. It lets text copied on one machine be pasted on another instantly, without relying on third-party cloud clipboard services. It was built through AI-assisted development, with me as architect and product owner.
Tiquetera: Gmail Receipt Scanning and Spending Analytics
https://tiquetera.esI built a Spanish web app that connects to users' Gmail accounts to find digital purchase receipts and turn them into spending analytics, starting with Mercadona. I implemented two separate OAuth2 flows: one for sign-in and a least-privilege gmail.readonly flow for receipt scanning, which is currently undergoing Google's OAuth verification. Receipts are parsed from PDF attachments into structured line items, with Chart.js dashboards and spreadsheet export. I built it through AI-assisted development, serving as the architect and product owner. The stack includes Symfony, PostgreSQL, smalot/pdfparser, Chart.js, and PhpSpreadsheet.
Education
1998 - 2003
Master's Degree in Computer Science
Universidad Politécnica de Madrid - Madrid, Spain
Certifications
JANUARY 2015 - PRESENT
Software Security
The University of Maryland via Coursera
Skills
Libraries/APIs
WooCommerce API, WordPress API, REST APIs, jQuery DataTables, Braintree API, Doctrine, jQuery UI, jQuery, React, Stripe API, Stripe, X (formerly Twitter) API, OpenStreetMap API, Leaflet, WordPress REST API, Highcharts, Infusionsoft API, Libcurl, LibC, GLib, OpenSSL, Stripe Connect, Salesforce API, Vimeo API, Gmail API, Google Drive API, Dropbox API, Chart.js, PhpSpreadsheet
Tools
ACF PRO, Advanced Custom Fields (ACF), Subversion (SVN), CVS, AffiliateWP, Stripe Checkout, GitHub, Bitbucket, GTK+, Exim4, Apache, DataTables, Redmine, Braintree SDK, Google Analytics, wkhtmltopdf, Gutenberg Editor, Sendmail, Handsontable, Git, Bower, SoapUI, Nagios, ANTLR, Turbo Pascal, Composer, Microsoft Visual Studio, Infusionsoft, AWS ELB, Amazon ElastiCache, Metorik, Figma, GTK, Zapier, Amazon CloudFront CDN, Gulp, Claude Code
Languages
PHP 5, HTML, PHP, C, HTML5, JavaScript, CSS, PHP 7, C++, CSS3, Bash, Bash Script, SQL, Visual Basic 6 (VB6), C#, Java, Assembler, Modula-2, TypeScript, YAML, Rust
Frameworks
Symfony 2, Symfony, .NET, BEEP, ASP.NET MVC, Selenium, Bootstrap 3, ASP.NET MVC 4, NHibernate, Tailwind CSS, OAuth 2
Platforms
WooCommerce, WordPress, Debian Linux, Linux, Ubuntu, LAMP, Web, Marketo, Debian, Azure, Docker, Embedded Linux, Android, Oracle, Windows, Amazon Web Services (AWS), Amazon EC2, VWO, WordPress Theme Design, Klaviyo, Linux RHEL/CentOS, Craft CMS, Drupal, Google Cloud Platform (GCP)
Storage
WP Engine, JSON, MariaDB, PostgreSQL, MySQL, MySQL Server, Databases, Microsoft SQL Server, Amazon S3 (AWS S3), Database Security, Redis, SQL Performance, WooCommerce Database
Paradigms
Model View Controller (MVC), Web Architecture, Web Performance Optimization (WPO), Hosting, Unit Testing, Responsive Layout, Responsive, Search Engine Optimization (SEO), Conversion Rate Optimization (CRO), Security Software Development, Compiler Design, Concurrent Programming, Agile Software Development, Mobile Development, Responsive Web Design (RWD)
Other
APIs, Web Hosting, Web Hosting & Domain Setup, Domains & Hosting, Local Hosting, Embedded Software, Unix Shell Scripting, gnoMint, WordPress Plugins, WooCommerce Subscriptions 2, eCommerce, Architecture, BrainTree, Content Management Systems (CMS), WordPress Themes, Full-stack Development, Integration, Web Development, API Integration, Software Architecture, Payment Processing, European Union (EU), Online Payments, DNS, DNS Configuration, Email Delivery, Domain Migration, Domain DNS Setup, WordPress SEO, System Administration, Legacy Code, Legacy Software, CAPTCHA, Ajax, GNU, TCP/IP, X.509, SOAP, Client-server Model, User Interface (UI), Payment APIs, Payment Gateways, Technical Leadership, Technical Reports, Query Composition, Query Optimization, Linux Server Administration, Stripe Payments, WordPress Design, Back-end Development, Back-end, Marketplaces, Cloudflare, Affiliate Marketing, User Experience (UX), Technical Architecture, Data Engineering, VAT Return Preparation, Load Time, Performance, Website Performance, CTO, Email, Code Review, Web Marketing, Ad Optimization, Gravity Forms, Infoplus WMS, SCADA, Dovecot, Image Manipulation, Embedded Systems, Linux Kernel Drivers, IT Security, Security, Payment Security, Shops, Search, Responsive Design, Responsive UI, Email Marketing, Email Marketing Automation, Google SEO, Organic SEO, SEO Tools, Data Visualization, Regular Expressions, Front-end, Front-end Development, Web Security, Programming, Compilers, Software Engineering, Distributed Software, Operating Systems, Microprocessors, Cryptography, Expert Systems, Networking, IP Networks, Internet Protocols, PayPal, PDF, Reports, SSL Certificates, X.509 Certificates, GnuTLS, RTLinux, Supervisory Control & Data Acquisition (SCADA), Document Management Systems (DMS), Employee Benefits, Dokan, Commerce, Amazon RDS, PHP Performance, Shippit, Leadership, Stripe Subscriptions, Client Portals, Dashboard Design, Stripe Marketplace, WordPress LMS, Learning Management Systems (LMS), Content Delivery Networks (CDN), Technical Writing, Pixel Perfect, Site Speed Optimization, Web Content Accessibility Guidelines (WCAG), EasyAdmin, Technical Documentation, AI-assisted Development, WebSockets, API Platforms, Browsers, Progressive Web Applications (PWAs), Browser Plugins, WebDAV, PDF Parsing
Collaboration That Works
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
1
Share your needs
Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2
Choose your talent
Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3
Start your risk-free talent trial
Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.
Top talent is in high demand.
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