Daniel Márquez Martínez

Software Developer · Technical Lead · Applied AI

I build and maintain web applications, mobile solutions, and AI integrations, with a focus on clear architecture, security, and maintainable code.

Based in Spain, I work with international clients in English and Spanish. My experience includes more than ten years of ongoing collaboration with a London-based company, combining hands-on development with technical leadership and long-term responsibility for evolving software.

About My Work

My strongest foundation is in PHP, JavaScript, and SQL, including extensive work with Laravel and CodeIgniter. I develop applications across the stack: database design, backend logic, APIs, responsive interfaces, and integrations with external services.

I approach development through the needs of the product. Choosing a language or framework is part of that process, alongside understanding requirements, defining sensible boundaries, and making the software easier to test, maintain, and extend.

Professional Work

My experience comes primarily from software developed for clients. The following areas describe my contributions without publishing client source code or private implementation details.

Web Applications and Business Systems

I develop and extend PHP applications using Laravel and CodeIgniter, adapting framework functionality where project requirements demand it.

My work includes:

AI Integration and Knowledge Retrieval

I have integrated AI capabilities into existing software products, connecting language models with application data and tools.

My experience includes:

I focus on making these capabilities fit the surrounding application, with attention to permissions, useful retrieval, and maintainable integration.

Mobile Applications and E-Learning

My mobile development experience includes Ionic and Apache Cordova, alongside JavaScript frameworks. I also actively work with Flutter as part of my broader development practice.

In e-learning, I have developed SCORM packages and worked with SCORM Cloud to integrate and manage learning content.

Technical Leadership and Delivery

As a Lead Developer and Project Manager, my responsibilities have included requirements analysis, task delegation, coding standards, testing, version control, and deployment across development, staging, and production environments.

I value clear communication and practical technical decisions that support both immediate delivery and future maintenance.

Working Across Technologies

Alongside my established PHP and JavaScript experience, I actively develop with Python, Go, Flutter, and Rust, using AI coding assistants to accelerate implementation and learning.

I remain responsible for architectural decisions, reviewing generated code, testing behavior, and evaluating security and maintainability. My experience across applications and frameworks helps me assess suggestions and adapt unfamiliar technologies to real project requirements.

Continuous learning is central to how I work. I combine documentation, experimentation, and AI-assisted exploration to learn new tools and apply them thoughtfully.

Beyond Software

I compose instrumental music and enjoy exploring digital music production—a creative counterpart to my technical work.

Contact

Based in Jerez de la Frontera, Spain. Working in English and Spanish.

Connect with me on LinkedIn