About
Full-Stack Web Developer & AI Specialist specializing in multilingual, cross-browser customisations, performance, AI/ML, and LLM Optimisation (LLMO). Passionate about the intersection of web performance, user experience, and future-ready content architecture.
Mariusz Szatkowski – WordCamp Gdynia 2025. Photo: Gerard Urbański
Mariusz
Szatkowski
Key Skills
Certifications
- Google Analytics Individual Qualification
- Google My Business Certificate
- Shopify: CRO Analysis and Optimization
- Shopify: CRO Implementation and Testing
- Shopify: CRO Overview and Best Practices
- Shopify: CRO Targeting and Personalization
- Shopify: Conversion Rate Optimization with Shopify Learning Path
- Shopify: Marketing Your Shopify Services as a Partner
- Shopify: Liquid Storefronts for Theme Developers
- Shopify: Creating a Digital Marketing Strategy
Connect
What people say about working with me.
Selected recommendations from WordPress, SEO and community projects.
Paweł Lewczuk
Front-end developer, WordPress developer
Mariusz was Paweł's client
"I collaborated with Mariusz on several projects and our cooperation was always exemplary. I believe there are many more joint projects ahead of us. Highly recommended!"
Przemek Wroblewski
Software Developer with 20+ years of experience
Worked with Mariusz on different teams
"I found Mariusz as someone with great expertise and profound knowledge of frontend solutions. Powerful, knowledgeable and accountable WordPress developer. Has an easiness to build interpersonal relati..."
Karolina Czapla
Marketing Strategist – Performance & Digital Strategy
Co‑organiser, WordCamp Gdynia 2024 & 2025
"Working with Mariusz on WordCamp has shown me how rare it is to combine deep technical skill with genuine leadership. He plans, coordinates and delivers with precision, while giving the team space to ..."
Karolina Czapla
Marketing Strategist – Performance & Digital Strategy
Co‑organiser, WordCamp Gdynia 2024 & 2025
"Working with Mariusz on WordCamp has shown me how rare it is to combine deep technical skill with genuine leadership. He plans, coordinates and delivers with precision, while giving the team space to ..."
Anna Kamińska
Talent Acquisition Specialist / HR People Partner
Worked on the same team
"Mariusz's portfolio speaks for itself – it reflects his precision, versatility and sense of responsibility. You can trust him to guide a project from idea to delivery, keep stakeholders informed and m..."
Sarah‑Luisa Kwolek
IT Project Management & Product Owner – Web/App
Mariusz was her client for WordPress work
"For over two years I could always rely on Mariusz to handle WordPress tasks calmly and professionally – from styling and templating to third‑party integrations. He brings steadiness to the team and ke..."
Argert Boja
Senior Full‑Stack Developer
Worked alongside Mariusz on WordPress projects
"Mariusz is the teammate everyone hopes for: strong full‑stack WordPress skills, clear explanations and a positive attitude even under pressure. He moves easily between custom plugins, performance work..."
Varun Patil
Growth & CRM Lead
Managed Mariusz on growth initiatives
"Beyond development, Mariusz understands SEO, analytics and growth. He talks directly with stakeholders, asks the right questions and ships solutions that move business metrics – from AMP to tracking t..."
Rafał Osiński
Founder @ EasyTrips.pl, Senior WordPress Dev
WordPress community co‑organiser
"I've known Mariusz through the WordPress community for many years. He's reliable, deeply involved and consistently shows up – at meetups, WordCamps and in projects. If you care about long‑term collabo..."
Daniel Blossfeld
Process Optimization & Digitalization Consultant
Mariusz was his client for WordPress work
"I had the pleasure of working with Mariusz for almost three years. During that time, his WordPress development skills proved invaluable across a range of projects, from website builds to online member..."
Natalie Wiszczor
CRM & E-Mail Marketing Manager
Worked with Mariusz on different teams
"I had the great pleasure of working with Mariusz for over 4 years in the technical field. During this time, he proved to be a competent and reliable colleague. What stood out in particular was his fri..."
Mark Chalklen
Head of Design & Build at Itineris Limited
Managed Mariusz directly
"Mariusz is a great member of the team, always happy to get stuck into any task and happy to learn new things. A great communicator and all round nice guy to work with. Hard to beat on our weekly Strav..."
Jessica Di Pasquale
Leading SEO initiatives with data-driven growth strategies.
Managed Mariusz directly
"Mariusz is a very skilled, patient and expert guy. Always ready to help and to fix errors, I really appreciated working with him. He is such a great colleague!"
Biki John
Content Marketing Aficionado & SEO Enthusiast
Worked with Mariusz on different teams
"It was great to work with Mariusz. I really appreciated his extensive knowledge of WordPress and how that came in handy whenever I needed support navigating the CMS. I commend Mariusz totally for his ..."
Rafal Borowiec
Software Developer, Consultant, Manager and Lecturer
Managed Mariusz directly
"I had an opportunity to work with Mariusz for 7 months. He excels in technical optimization for search engines (SEO). Mariusz has also strong expertise in AMP development, GTM, and GA. Mariusz feels v..."
Belinda Koch
Web-Tracking Analyst at TUI
Worked with Mariusz on digital analytics and tracking topics
"Mariusz is a great person to work with. He is extremely motivated to learn new things and share his knowledge, and is very knowledgeable on a wide range of topics. We worked together on digital analyt..."
Ali Nezamolmaleki
Growth, SEO, Analytical thinking, AMP
Worked with Mariusz on the same team
"Mariusz is an extremely talented person in his field of work. He is always capable of giving a new perspective to solve problems and to think out of the box in situations where everything seems to be ..."
Karol Jakubcewicz
Front-end / JavaScript Developer
Worked with Mariusz on the same team
"Mariusz is an incredibly experienced WordPress developer and SEO/SEM specialist I've had the pleasure to work with for almost two years. As a pilot of the team responsible for AirHelp's website develo..."
Paweł Lewczuk
Front-end developer, WordPress developer
Mariusz was Paweł's client
"I collaborated with Mariusz on several projects and our cooperation was always exemplary. I believe there are many more joint projects ahead of us. Highly recommended!"
Przemek Wroblewski
Software Developer with 20+ years of experience
Worked with Mariusz on different teams
"I found Mariusz as someone with great expertise and profound knowledge of frontend solutions. Powerful, knowledgeable and accountable WordPress developer. Has an easiness to build interpersonal relati..."
Karolina Czapla
Marketing Strategist – Performance & Digital Strategy
Co‑organiser, WordCamp Gdynia 2024 & 2025
"Working with Mariusz on WordCamp has shown me how rare it is to combine deep technical skill with genuine leadership. He plans, coordinates and delivers with precision, while giving the team space to ..."
Karolina Czapla
Marketing Strategist – Performance & Digital Strategy
Co‑organiser, WordCamp Gdynia 2024 & 2025
"Working with Mariusz on WordCamp has shown me how rare it is to combine deep technical skill with genuine leadership. He plans, coordinates and delivers with precision, while giving the team space to ..."
Anna Kamińska
Talent Acquisition Specialist / HR People Partner
Worked on the same team
"Mariusz's portfolio speaks for itself – it reflects his precision, versatility and sense of responsibility. You can trust him to guide a project from idea to delivery, keep stakeholders informed and m..."
Sarah‑Luisa Kwolek
IT Project Management & Product Owner – Web/App
Mariusz was her client for WordPress work
"For over two years I could always rely on Mariusz to handle WordPress tasks calmly and professionally – from styling and templating to third‑party integrations. He brings steadiness to the team and ke..."