jmazur

From: Poland

Location: Luboń

On Useme since 18 October 2026

About me

I’m an IT Engineer, Full-Stack Developer and Tech Lead with 15+ years of professional experience. I build and improve e-commerce stores (Shopify/Magento) and web apps with React, Vue, Svelte and Next.js, and develop and publish Flutter apps for iOS and Android. I build backends with PHP/Laravel and Node.js/Express, using Firebase and MySQL. I handle architecture, coding, testing, deployment and analytics.

I’m pursuing a master’s in IT, specializing in AI, to build my own optimized, task-specific models rather than defaulting to large general-purpose models. I integrate AI features and build MCP tools. I use coding agents, personally reviewing and testing their code.

I’ve worked on projects for Komputronik Biznes, 4F, MK Cafe, Komfort, Spokey, Drogerie Natura, Fast White Cat, Makro, Aviko and Autostrada Wielkopolska S.A.

I also take on small B2B projects: bug fixes, API integrations, new screens, performance and Core Web Vitals (CrUX) improvements. Get in touch to discuss scope, pricing and timelines.

Skills

3d 3D graphics AI Android Automatic tests Chatgpt Claude code Dart EU project Express.js Flutter Game Designers Git Google Tag Manager GraphQL IOS Javascript Machine learning Magento Mobile games Mysql Next.js NodeJS PHP Python React SQLite Typescript Unity3D Vue Wordpress

CV / Résumé

Aug 2026 - Now

Lead Mobile Developer

Drogerie Natura

I independently develop and release a Flutter app for iOS and Android used by hundreds of thousands of people. I added a loyalty program, migrated the Magento integration from REST to GraphQL and expanded the test suite from 13 to over 270 tests.

Sep 2022 - Aug 2023

Senior React Developer

4F – OTCF S.A.

I implemented the new design for 4f.com.pl (Magento, Venia/React), optimized mobile performance and co-developed an A/B testing system with a browser extension for previewing different variants.

Dec 2019 - Now

E-Commerce Tech Lead

Komfort

I migrated the Magento storefront from Vue to React and improved CrUX metrics. I’m adding new features, including a booking system, PRO area, blog, terrace configurator and inspiration section. We’re also working on AI-generated inspiration.

Dec 2015 - Nov 2019

Senior Frontend Developer

Komputronik Biznes

I built web and mobile apps for motorway maintenance crews and pallet inspectors at Makro, e-kiosk and printer interfaces, a remote operations system and a custom CRM. I also trained an AI model to check construction workers’ equipment.

Sep 2015 - Dec 2015

Full Stack Developer

G2 TEAM

Byłem odpowiedzialny za tworzenie całych stron w Wordpress z makiet.

Portfolio

4F OTCF S.A.

Byłem odpowiedzialny za Frontend sklepu 4F.

MK Cafe / Fresh / Horeca

Byłem odpowiedzialny za Frontend sklepu MK Cafe i masek Fresh i Horeca.

Drogeria Natura - Aplikacja

Jestem odpowiedzialny za całą aplikację mobilną firmy Drogeria Natura na iOS i Android.

Solar Progress

Stworzyłem całą stronę na wordpress.

M&D Exclusive Wrapping

Byłem odpowiedzialny za Frontend w Angularze i backend w Wordpress.

Jakub Niepsuj Barber

Stworzyłem nowoczesny system rezerwacji z doradcą usług AI dla klientów spełniający wymogi dofinansowania EU.

Spokey

Byłem odpowiedzialny za nowy frontend sklepu Spokey.

Stratos Opony

Przerabiałem Frontend i usprawniałem panel administratora portalu.

Studio AG