MS-M

MarcinSiemieniuk-Morawski

FULL STACK DEVELOPER - PHP · WORDPRESS · REACT · REACT NATIVE

I'm a Full Stack Developer with over 8 years of experience in web and e-commerce projects. I specialise in PHP, WordPress and WooCommerce - but I rarely work on just one layer of a project.

About me

By nature I'm a maker, and by approach - someone who always looks for solutions.

I started as a Front-end Developer, but it didn't take long before I wanted more - I wanted to understand the full picture and have a real impact on how projects were shaped. That's how I found my way into Full Stack Development.

Over the years I've learned that I get the best results when I understand not just the code, but the business goal behind the project.

That's why, beyond implementation, I often get involved in requirements analysis, choosing the right technical solutions, and talking directly with clients - especially when a project is complex and needs a well-thought-out architecture from the start.

I work with both agencies and companies directly - on long-term projects where it matters not just that things work, but that they can be sensibly built upon a year or two down the line.

In my day-to-day work I use AI tools — Claude Code and GitHub Copilot — which lets me move faster and focus on what really matters: architecture and business logic.

Experience

  1. Full Stack Developer

    2020 – March 2026

    MobilitySoft

    • WordPress
    • WooCommerce
    • React Native
    • Git
    • Building custom WordPress plugins and integration systems
    • Integrations with payment, logistics, and CRM systems
    • Web and mobile projects (React Native) for businesses and institutions
    • Themes and Gutenberg / ACF blocks
  2. Full Stack Developer

    2018 – present

    Freelancer

    • WordPress
    • Fabric.js
    • REST API
    • ACF
    • Online product configurator (JavaScript, Fabric.js)
    • API integrations: payments, logistics, automations
    • Custom WordPress themes and Gutenberg blocks
    • Independent project management, international clients
  3. Front-end Developer

    2017 – 2018

    Scorice

    • HTML
    • CSS
    • JavaScript
    • WordPress
    • Building user interfaces
  4. IT Specialist

    2015 – 2017

    Urząd Gminy Dubicze Cerkiewne

    • IT
    • WordPress
    • Admin
    • IT infrastructure maintenance
    • Administration of the municipal website

Skills

PHP / WORDPRESS / WOOCOMMERCE

  • Custom themes & plugins
  • Gutenberg blocks & ACF Blocks
  • WooCommerce extensions & customisation
  • Payment & delivery integrations
  • Custom post types & admin panels

MODERN FRONTEND

  • React & Next.js
  • Static sites with Gatsby
  • SCSS
  • Gutenberg (native blocks)
  • Responsiveness & performance

MOBILE DEVELOPMENT

  • React Native & Expo
  • REST API & OAuth integration
  • Push notifications
  • Expo-based mobile development
  • App Store / Google Play delivery

API & INTEGRATIONS

  • REST & GraphQL
  • Payment systems (Stripe, Przelewy24)
  • CRM / ERP / Google Services
  • Automations & webhooks
  • Third-party API integrations & SMS gateways

AI-ASSISTED DEVELOPMENT

  • Claude Code — agentic coding, refactoring
  • GitHub Copilot — code completion
  • Prompt engineering for dev workflow
  • AI in planning and code review

Stack

  • PHP
  • WordPress
  • WooCommerce
  • JavaScript
  • React
  • Next.js
  • Gatsby
  • React Native
  • Expo
  • REST API
  • GraphQL
  • ACF
  • Gutenberg
  • SCSS
  • MySQL
  • Git
  • Composer
  • Figma
  • Claude Code
  • GitHub Copilot

Want to start a project?

Let's Talk

Get in touch