Consultation and quote
A free conversation about your needs, goals and budget. On that basis I prepare a concrete, no-obligation quote and schedule.
Senior PHP Developer • Laravel • WordPress
I build high-performance applications and backend systems that power your business
I create reliable solutions in PHP, Laravel and WordPress. API integrations, high performance and scalability for systems serving hundreds of thousands of users.
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How I work
From idea to a working system — scroll to see each stage
Technologies
The stack I work with every day
PHP 8+
Laravel
WordPress
WooCommerce
Docker
MySQL
Redis
Git
CI/CD
REST API
Backend Development
Design and development of high-performance backend applications in PHP 8+ and Laravel. MVC architecture, SOLID, clean code and tests.
Let's talkREST API integrations
I integrate systems with external services and APIs — from payment gateways, through couriers, to ERP systems (MS Dynamics 365).
Let's talkWordPress / WooCommerce
I build plugins, themes and WooCommerce integrations that extend what stores and portals can do. ACF, Gutenberg, multisite.
Let's talkPerformance & Scalability
I optimise databases, caching (Redis), queues and queries. I build systems that stand up to heavy traffic — Elasticsearch, Laravel Queues.
Let's talkFeatured project
Over 10,000+ active installations
Flagship project
InPost Parcel Lockers for WooCommerce
My own public WordPress/WooCommerce plugin integrating InPost parcel lockers. I have been building and maintaining it since 2021 — thousands of stores in Poland and abroad rely on it.
- Parcel locker map in the checkout
- Parcel locker details in the order view
- Flexible shipping method configuration
- Regular updates and support
Personal project
Traxoria — a database of summits you have climbed
My own Laravel platform for tracking climbed summits and the Crown of Polish Mountains. Designed and built from scratch — database, public REST API, a Filament admin panel, authentication, photo uploads and offline mode. A complete product delivered solo — from architecture, through the API, to deployment.
- A database of 105 summits across 47 mountain ranges
- Crown of Polish Mountains progress tracking (28 summits)
- Public REST API and a Filament admin panel
- Summit photos, statistics and social features
- Works offline as a Progressive Web App (PWA)
Experience
Over 8 years of commercial practice
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2021 — present
Author of the InPost Parcel Lockers plugin
wordpress.org / personal project
- Architecture, development and maintenance of a public WooCommerce plugin
- Compatibility with successive WordPress and WooCommerce releases
- Support for thousands of stores in Poland and abroad
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2017 — present
PHP Developer
Ideo, Rzeszów
- Designing modules in MVC architecture (Laravel) and building REST APIs
- High-performance e-commerce systems: Redis, Laravel Queues, Elasticsearch / Meilisearch
- CI/CD (GitHub Actions, Bitbucket Pipelines), Docker, deployments on Ubuntu
- Integrations with ERP (Microsoft Dynamics 365 Business Central) and external services
- Working with a Norwegian team on international projects
- R&D in AI and automation, frontend in Vue.js
User reviews
Genuine 5★ reviews of the InPost Parcel Lockers plugin from wordpress.org
A great, easy-to-use plugin! Anyone can handle it. It doesn't weigh the site down. Highly recommended!!!
It does its job 100% — used on a large and complicated project — it works flawlessly. Simple, yet clear and readable. No developer should have trouble configuring it.
A great plugin and a great author 🙂 The problem I ran into was solved the very same day I wrote to Damian.
Works great. A very simple and useful app. Huge thanks to the creator!
I use Flatsome Theme and it is really well working together. Thanks for a great job!
Polish native
English B2
Norwegian A2
About me
My name is Damian Ziarnik and I'm a Senior PHP Developer with over 8 years of experience building modern backend solutions. I specialise in Laravel, WordPress and WooCommerce — from architecture, through integrations, to performance optimisation.
- Laravel, WordPress, WooCommerce, PHP 8+, MySQL, REST API
- Optimisation, performance, scalability, clean code (SOLID)
- API integrations and ERP systems (MS Dynamics 365)
- High-availability, high-traffic systems
- Working in international remote teams
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Support the plugin's development
I build and maintain the free InPost Parcel Lockers plugin for WooCommerce, which saves time and helps thousands of stores every day.
If the plugin helped you save time or earn more — consider supporting its further development. Thank you!
Frequently asked questions
Everything worth knowing before we start working together
How does working together start?
We start with a free consultation — we discuss your needs, the scope and the budget. Then I prepare a quote and a schedule. Once you accept, we get to work and you receive regular progress reports.
Do you work remotely and with clients abroad?
Yes. I have worked remotely for years, including in international teams (among others with partners from Norway). I communicate fluently in Polish and English.
Do you maintain existing projects?
Yes — I take over and develop existing Laravel, WordPress and WooCommerce applications. I start with a code and performance audit, then propose a refactoring and development plan.
How much does an API integration or a WooCommerce plugin cost?
The cost depends on the scope — a simple integration takes a few days, an extensive system is a project of several weeks. After a short conversation I'll prepare a free, no-obligation quote.
Contact
Got a project or a question? Get in touch — I usually reply within 24 h.
Email
kontakt@grainsoft.pl
LinkedIn
linkedin.com/in/damian-ziarnik
Location
Rzeszów, Poland (remote)