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
Full Stack Developer
2020 – March 2026
MobilitySoft
- 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
Full Stack Developer
2018 – present
Freelancer
- Online product configurator (JavaScript, Fabric.js)
- API integrations: payments, logistics, automations
- Custom WordPress themes and Gutenberg blocks
- Independent project management, international clients
Front-end Developer
2017 – 2018
Scorice
- Building user interfaces
IT Specialist
2015 – 2017
Urząd Gminy Dubicze Cerkiewne
- 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


