Headless WordPress development

Karolina Czapla

Marketing Strategist, Performance & Digital Strategy

“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 grow and contribute....”

Co‑organiser, WordCamp Gdynia 2024 & 2025

Anna Kamińska

Talent Acquisition Specialist / HR People Partner

“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 make sure things are d...”

Worked on the same team

Sarah‑Luisa Kwolek

IT Project Management & Product Owner, Web/App

“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 keeps the frontend side...”

Mariusz was her client for WordPress work

Argert Boja

Senior Full‑Stack Developer

“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 and Gutenberg layou...”

Worked alongside Mariusz on WordPress projects

Varun Patil

Growth & CRM Lead

“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 to performance.”

Managed Mariusz on growth initiatives

Rafał Osiński

Founder @ EasyTrips.pl, Senior WordPress Dev

“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 collaboration and someone wh...”

WordPress community co‑organiser

Daniel Blossfeld

Process Optimization & Digitalization Consultant

“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 areas and even Shop...”

Mariusz was his client for WordPress work

Natalie Wiszczor

CRM & E-Mail Marketing Manager

“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 friendly nature and his...”

Worked with Mariusz on different teams

Mark Chalklen

Head of Design & Build at Itineris Limited

“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 Strava leader board thoug...”

Managed Mariusz directly

Jessica Di Pasquale

Leading SEO initiatives with data-driven growth strategies.

“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!”

Managed Mariusz directly

Biki John

Content Marketing Aficionado & SEO Enthusiast

“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 patience, good natur...”

Worked with Mariusz on different teams

Rafal Borowiec

Software Developer, Consultant, Manager and Lecturer

“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 very comfortable with...”

Managed Mariusz directly

Belinda Koch

Web-Tracking Analyst at TUI

“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 analytics and tracking top...”

Worked with Mariusz on digital analytics and tracking topics

Ali Nezamolmaleki

Growth, SEO, Analytical thinking, AMP

“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 locked. Working with...”

Worked with Mariusz on the same team

Karol Jakubcewicz

Front-end / JavaScript Developer

“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 development, he's been one...”

Worked with Mariusz on the same team

Paweł Lewczuk

Front-end developer, WordPress developer

“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!”

Mariusz was Paweł's client

Przemek Wroblewski

Software Developer with 20+ years of experience

“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 relations with others. He ...”

Worked with Mariusz on different teams