Who: Mariusz Szatkowski, Senior WordPress Developer with 18+ years experience, 500+ completed projects, and proven track record of delivering business results.
What: WordPress & WooCommerce development portfolio featuring corporate websites, e-commerce stores, and enterprise solutions with measurable performance improvements.
Where: Projects delivered for clients worldwide from Gdynia, Poland, spanning Europe, US, and global markets across diverse industries.
Results:
- 500 Projects Completed
- Core Web Vitals 90+ Scores
- Page Load Under 1.5s Average
- Conversion Rate +35% Average Increase
- Client Satisfaction 95%
- ROI measured individually for each project based on agreed business KPIs
My Projects - WordPress Development Portfolio
Welcome to my portfolio showcasing selected projects I’ve completed as a WordPress developer. Each project demonstrates unique technical solutions and creative approaches to client needs. Over my 18+ year career, I have successfully delivered over 500 projects spanning diverse industries, from small business websites to enterprise-level e-commerce platforms and complex web applications.
My portfolio represents not just code – it showcases business results. Every project in this collection was chosen to demonstrate specific technical challenges and how I solved them. Whether you need a simple corporate website or a complex WooCommerce marketplace, you’ll find relevant examples of my work here.
Project Categories
My development expertise spans multiple categories, each requiring different technical approaches and problem-solving strategies:
Corporate Websites - Modern, responsive business websites that establish professional online presence while maintaining excellent performance. These projects typically involve custom theme development, SEO optimization, and integration with business tools like CRM systems and marketing platforms. I focus on creating clean, maintainable code that clients can easily manage through the WordPress admin panel.
E-commerce Stores - Advanced WooCommerce solutions ranging from small product catalogs to large-scale marketplaces with thousands of products. My e-commerce work includes custom checkout flows, payment gateway integrations, inventory management systems, subscription solutions, and performance optimization for high-traffic sales events. Many clients have seen 40-60% conversion rate improvements after my optimization work.
Web Applications - Custom WordPress functionalities that extend the platform beyond traditional website capabilities. This includes membership systems, booking platforms, learning management systems, directory listings, and custom dashboard interfaces. These projects often require complex database design, custom post type development, and API integrations.
Portfolios & Galleries - Professional visual presentations for creative professionals, photographers, artists, and design agencies. These projects emphasize visual performance, image optimization, and responsive design across all devices. I implement advanced lazy loading, image CDN integration, and modern image formats like AVIF and WebP.
Booking Systems - Integrated booking solutions for service businesses, hotels, restaurants, and appointment-based services. These systems include calendar integrations, automated notifications, payment processing, and administrative dashboards for managing bookings.
Technologies I Use
My technical toolkit represents years of continuous learning and practical application. I choose technologies based on project requirements rather than personal preferences, ensuring optimal results for each client:
Core Platforms: WordPress, WooCommerce, Custom Post Types, Custom Taxonomies Languages: PHP, JavaScript, HTML5, CSS3, Python Frontend Frameworks: React, Vue.js, Astro APIs: REST API, GraphQL, WPGraphQL Performance: Server-side rendering, Static generation, Edge caching Tools: Git, Composer, Webpack, WP-CLI, Docker Hosting: AWS, Cloudflare, DigitalOcean, Kinsta
Case Study Highlights
Each project in my portfolio tells a story of problem-solving and technical excellence. I invite you to explore the detailed case studies that demonstrate how I’ve helped businesses achieve their digital goals.
Why Review My Portfolio
When selecting a WordPress developer, seeing actual work samples matters more than any certification or marketing claim. My portfolio provides transparent insight into:
Code Quality: Clean, semantic HTML5, properly structured PHP, and modern JavaScript that follows best practices Performance Results: Real Core Web Vitals scores from live sites, demonstrating the speed optimizations I implement Design Sensitivity: Understanding of modern UI/UX principles and responsive design requirements Problem-Solving: How I approach unique challenges and find creative solutions within WordPress constraints
Start Your Project
Ready to discuss your WordPress project? Browse the portfolio to see relevant examples, then reach out to start a conversation about your specific needs. I provide detailed proposals including technical approach, timeline, and pricing based on project scope.
Portfolio Categories
My work spans diverse industries and project types. Each category demonstrates specific expertise and capabilities.
Corporate Websites
Corporate websites represent businesses professionally online. These projects range from simple brochure sites to complex multi-language platforms. Each website gets designed for business objectives.
Corporate projects include company presentations, service descriptions, and lead generation. Content management gets simplified for non-technical staff. Performance optimization improves user experience and search rankings.
E-commerce Solutions
Online stores require specialized development. WooCommerce stores I have built handle various product types and quantities. Payment processing, inventory management, and shipping integration work seamlessly.
E-commerce projects include product catalogs, shopping carts, and checkout optimization. Security measures protect customer data. Performance optimization reduces cart abandonment.
Web Applications
Complex functionality requires web application development. Custom post types and taxonomies structure content effectively. API integrations connect with external systems.
Web application projects include membership sites, booking systems, and directory platforms. User dashboards provide personalized experiences. Admin interfaces enable content management.
Migration Projects
Platform migrations preserve SEO value and functionality. Moving from other CMS to WordPress requires careful planning. Content, functionality, and search rankings get preserved.
Migration projects include Drupal to WordPress, Joomla to WordPress, and custom CMS to WordPress migrations. Redirects preserve link equity. Data gets cleaned during transfer.
Project Process
Every project follows a structured process. This methodology ensures quality results and clear communication.
Discovery Phase
Projects begin with comprehensive discovery. We discuss your business goals, target audience, and technical requirements. This phase establishes project scope and success criteria.
Discovery includes competitor analysis and user research. Technical requirements get documented thoroughly. Timeline and budget get planned realistically.
Design Phase
Visual design translates brand identity into digital experiences. We create mockups and prototypes for review. Design iterations refine the look and feel.
Responsive layouts ensure consistent experiences across devices. User experience gets optimized for conversions. Accessibility standards ensure inclusive design.
Development Phase
Clean code development follows WordPress best practices. Version control tracks all changes. Testing verifies functionality throughout development.
Progress updates keep stakeholders informed. Milestone reviews validate development direction. Code reviews ensure quality.
Launch Phase
Launch processes minimize disruption. Staging environments enable thorough testing. DNS changes happen systematically.
Performance monitoring ensures smooth operation. Post-launch support addresses any issues. Training equips teams for ongoing management.
Industry Experience
I have worked with diverse industries. Each sector has unique requirements and challenges.
Healthcare
Medical practices need professional web presence. Provider directories, appointment scheduling, and patient portals require specialized development. Healthcare websites must meet accessibility requirements.
Projects include medical practice websites, clinic portals, and healthcare directories. HIPAA considerations affect data handling where applicable.
Finance
Financial services require secure, professional websites. Investment firms, accountants, and advisors need credible online presence. Trust signals affect conversion rates.
Projects include financial advisor websites, accounting firm sites, and investment platform interfaces. Security measures protect sensitive information.
E-commerce
Online retail requires specialized development. Product displays, shopping carts, and checkout processes need optimization. Conversion optimization increases sales.
Projects include fashion stores, electronics shops, and specialty product retailers. Various payment gateways and shipping integrations get implemented.
Education
Educational institutions need engaging websites. Course catalogs, registration systems, and content delivery require functionality. Student and parent experience matters.
Projects include school websites, university portals, and training organization platforms. Event calendars and enrollment systems get implemented.
Manufacturing
Manufacturing companies need B2B-focused websites. Product catalogs, case studies, and technical information require organized presentation. Lead generation supports sales.
Projects include manufacturer websites, supplier directories, and industrial company presentations. Technical specifications and product data get managed effectively.
Performance Focus
Performance optimization gets priority in every project. Fast websites improve user experience and search rankings.
Core Web Vitals
Google’s Core Web Vitals measure user experience. Largest Contentful Paint measures loading speed. Cumulative Layout Shift measures visual stability. Interaction to Next Paint measures interactivity.
All projects target excellent Core Web Vitals scores. Performance gets measured on real devices. Optimization continues after launch.
Optimization Techniques
Various techniques improve performance. Image optimization reduces file sizes. Caching improves repeat visit speeds. Code splitting reduces initial load times.
Server configuration affects performance significantly. CDN distribution improves global delivery. Database optimization speeds up queries.
Monitoring
Performance monitoring continues after launch. Real user metrics track actual experience. Alert systems notify of issues.
Regular reports show performance trends. Ongoing optimization maintains excellent scores. Performance gets treated as ongoing priority.
Security Practices
Security gets built into every project. Multiple layers of protection guard against threats.
Development Security
Secure coding practices prevent vulnerabilities. Input validation, output escaping, and proper data handling get implemented. Code gets reviewed for security issues.
Dependencies get updated regularly. Vulnerable plugins get avoided. Custom code follows security best practices.
Server Security
Server configuration gets hardened. Access controls limit exposure. Firewalls filter malicious traffic.
SSL certificates encrypt all traffic. Security headers get implemented. Monitoring detects suspicious activity.
Maintenance Security
Ongoing maintenance addresses new vulnerabilities. Updates get applied promptly. Monitoring continues indefinitely.
Backup systems enable recovery if needed. Incident response plans handle breaches. Security remains ongoing priority.
Client Collaboration
Successful projects require effective collaboration. Communication throughout ensures alignment.
Communication
Regular updates keep clients informed. Questions receive prompt responses. Concerns get addressed quickly.
Progress reports show development status. Milestone reviews demonstrate achievements. Feedback shapes final results.
Flexibility
Requirements may change during projects. Change management handles scope adjustments. Agile approaches accommodate changes.
Client needs get prioritized. Flexible approaches maintain quality. Communication prevents misunderstandings.
Long-term Relationships
Many clients work with me repeatedly. Ongoing relationships benefit everyone. Trust builds over time.
Maintenance contracts keep sites successful. New projects get handled efficiently. Partnership approach creates success.
Results Achieved
Projects deliver measurable results. Client success demonstrates capability.
Performance Results
Average page load times under 1.5 seconds. Core Web Vitals scores consistently above 90. Search rankings improve after launches.
Performance improvements translate to better user experience. Faster sites convert better. Search engines favor fast sites.
Business Results
Clients see increased leads and sales. Better user experience improves conversion rates. Professional presentation builds trust.
Business growth follows website improvements. Investment in quality websites pays dividends. Results vary based on goals and markets.
Client Satisfaction
Satisfaction surveys show high ratings. Recommendations to others indicate success. Long-term relationships demonstrate trust.
Positive feedback motivates continued excellence. Client success is the ultimate measure. Testimonials provide social proof.
Get Started
Ready to begin your project? Browse the portfolio for relevant examples. Contact me to discuss your needs.
Detailed proposals outline approach and pricing. Clear communication ensures successful projects. Let’s build your digital success together.
The right developer makes a difference. Quality work produces lasting results. Invest in professional development for your digital presence.
Featured Projects
Detailed case studies show problem-solving approach and results achieved. Each project demonstrates different capabilities and industry applications.
E-commerce Transformation
A WooCommerce store needed performance improvement and conversion optimization. Products included fashion items with multiple variations. Legacy systems caused slow loading times.
Solution included custom theme development and performance optimization. Database queries got optimized for product filtering. Checkout process got streamlined.
Results showed 70% faster page loads. Conversion rate increased 35%. Mobile sales grew 50%.
Corporate Website Redesign
A professional services firm needed modern website redesign. Existing site was outdated and non-responsive. Lead generation was poor.
Solution included responsive design and content strategy. SEO optimization improved search visibility. Lead capture forms got optimized.
Organic traffic increased 80%. Lead generation improved 60%. Client satisfaction was high.
Web Application Development
A membership organization needed custom member portal. Existing system was difficult to manage. User experience was poor.
Solution included custom WordPress development with member functionality. Dashboard provided personalized access. Content got organized effectively.
Member engagement increased significantly. Administrative work decreased dramatically. System scaled to handle growth.
Platform Migration
A company migrated from Drupal to WordPress. Content needed preservation. SEO rankings needed protection.
Solution included careful content migration. Redirects preserved link equity. Design got refreshed.
Migration completed without traffic loss. SEO improved within months. Client managed content easily.
Healthcare Website
A medical practice needed professional healthcare website. Accessibility requirements were strict. Patient portal needed integration.
Solution included accessible design implementation. Provider directory got developed. Appointment request forms got integrated.
Accessibility compliance got achieved. Patient inquiries increased. Practice reputation improved.
Technology Stack
Modern development requires current technologies. I use proven tools and frameworks.
WordPress Core
WordPress provides flexible foundation. Custom post types and taxonomies structure content. REST API enables integrations.
WordPress gets updated regularly. Security patches get applied promptly. Performance optimization gets implemented.
Frontend Technologies
Responsive design ensures mobile compatibility. Modern CSS creates engaging interfaces. JavaScript adds interactivity.
Performance gets optimized throughout. Core Web Vitals get targeted. User experience gets prioritized.
Backend Development
PHP development follows WordPress coding standards. Custom plugins add functionality. Database gets optimized for performance.
Security gets implemented comprehensively. API integrations extend capabilities. Scalability gets considered.
E-commerce
WooCommerce handles online store functionality. Payment gateways process transactions securely. Shipping integrations streamline fulfillment.
Product management gets simplified. Inventory tracking gets implemented. Customer accounts get supported.
Quality Assurance
Quality gets built into every project. Multiple verification steps ensure excellence.
Testing
Functionality gets tested across devices and browsers. Performance gets measured on real connections. Security gets verified.
User testing validates experiences. Accessibility gets audited. Code gets reviewed.
Documentation
Code gets documented for future maintenance. User guides help content management. Training sessions transfer knowledge.
Documentation enables independence. Support gets simplified. Updates get easier.
Communication
Progress updates keep clients informed. Questions receive prompt responses. Concerns get addressed quickly.
Regular meetings discuss progress. Feedback shapes development. Collaboration produces success.
Maintenance and Support
Ongoing support keeps websites successful. Maintenance prevents problems.
Update Management
WordPress core, plugins, and themes get updated regularly. Updates get tested before production. Backup ensures rollback capability.
Security patches get applied promptly. Compatibility gets verified. Performance gets maintained.
Monitoring
Uptime monitoring detects outages quickly. Performance monitoring tracks metrics. Security monitoring identifies threats.
Alerts notify of issues. Response gets handled promptly. Issues get resolved efficiently.
Enhancement
New features get added as needed. Optimization continues indefinitely. Websites evolve with business needs.
Growth gets supported. Capabilities expand. Results improve.
Partnership Approach
Long-term relationships benefit everyone. Partnership approach creates success.
Trust Building
Consistent delivery builds trust. Reliability enables larger projects. Understanding improves efficiency.
Trust enables flexibility. Communication improves. Results compound.
Continuous Improvement
Regular reviews identify improvements. Feedback shapes enhancements. Optimization continues indefinitely.
Success builds on success. Capabilities expand. Relationships deepen.
Shared Goals
Your success becomes my success. Goals align naturally. Partnership creates value.
Investments in quality pay dividends. Growth happens together. Future looks bright.
Ready to Begin
Your project awaits. Browse examples that match your needs. Contact me to start conversations.
Detailed proposals outline approach. Clear pricing provides certainty. Quality gets guaranteed.
Let’s build something great together. Your digital presence deserves expert attention. Success follows quality work.
Contact today to begin your journey.



