Adrian Callaghan
PHP Certified Engineer
Framework Certified Engineer
W3 CSS Certified
BSc Hons Computer Science
Backend
PHP, Python, Node.js, APIs
Frontend
React, Vue, JavaScript, CSS
Database
MySQL, PostgreSQL, MongoDB
DevOps
Docker, Linux, Cloud, CI/CD
Experienced Systems Architect & Full Stack Developer
With over 15 years of experience in enterprise software development, I specialize in architecting scalable solutions and leading technical teams. Based in Dunstable, UK, I work with organizations to build robust, high-performance systems that drive business growth.
Core Expertise
I bring deep technical expertise across the full technology stack, from database optimization and server architecture to modern frontend frameworks and cloud deployment. My approach combines solid engineering principles with agile development practices to deliver solutions that are both technically excellent and business-focused.
- Backend Development: PHP (Zend Certified), Python, Node.js, RESTful APIs, Microservices
- Database Design: MySQL, PostgreSQL, MongoDB, Performance Optimization, Replication
- Frontend Technologies: JavaScript ES6+, React, Vue.js, CSS3 (W3C Certified), Responsive Design
- Infrastructure: Linux Administration, Docker, Cloud Platforms, Load Balancing, Security
- Leadership: Technical Team Management, Architecture Planning, Code Review, Mentoring
Development Philosophy
I believe in writing clean, maintainable code that stands the test of time. Every project begins with understanding the business requirements and translating them into technical solutions that are scalable, secure, and performant. I advocate for:
- Test-driven development and comprehensive documentation
- Continuous integration and deployment practices
- Security-first approach to application development
- Performance optimization from the ground up
- Collaborative development with cross-functional teams
Industry Experience
Throughout my career, I’ve had the privilege of working with leading brands and organizations across various sectors. My client portfolio includes major automotive brands (Land Rover, Audi, Vauxhall), technology companies (Adobe, Intel, Oracle), retail and lifestyle brands (Burberry, David Lloyd), and many others.
This diverse experience has given me insights into different business models, technical challenges, and scaling requirements across industries.
Professional Status
I’m currently available for consulting engagements, technical leadership roles, and full-stack development projects. I work both on-site in the Dunstable area (within 1 hour travel) and remotely with distributed teams.
Whether you need someone to architect a new system from the ground up, optimize existing applications, or lead a technical team through a complex migration, I bring the experience and expertise to deliver results.
Let’s Discuss Your Project
If you’re looking for a technical partner who can understand your business needs and translate them into robust, scalable solutions, I’d love to hear about your project. I’m always interested in challenging problems and opportunities to create innovative solutions.
Connect with me on LinkedIn or use the contact form to discuss how we can work together.
Infrastructure & OS
Linux (Gentoo, Arch, Debian, CentOS, Fedora), Windows, macOS
Apache, Nginx, Varnish, Cloud Platforms, Load Balancers, Security
Database & Storage
MySQL 5-8, PostgreSQL, MongoDB
Advanced SQL, Stored Procedures, Triggers, Views, Replication
Data Modeling, Normalization, Performance Optimization
Programming & Frameworks
PHP: Certified Engineer, Zend Framework, Laravel, WordPress
JavaScript: ES6+, React, Vue.js, Node.js, jQuery
Python: Django, Flask, Data Analysis
Tools: Docker, Git, Composer, NPM, Webpack
Frontend & Design
HTML5, CSS3 (Certified), SASS/SCSS, Bootstrap, Responsive Design
Modern JavaScript, Progressive Web Apps, Accessibility Standards
Fizz Buzz and Fibbonacci combined
running PHP 7 and PHP 5 together – ubuntu
WordPress, concrete5, ZF2, PHP, mysql database dump
Ready to Collaborate?
I'm currently available for consulting, development projects, and full-time opportunities in the Dunstable area and remote work.