11/10/2026 updated

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Full-Stack Web Developer | PHP, Laravel, React, TypeScript, WordPress

Gdańsk, Poland
Only remote
Bachelor in Computer Science, specialisation: Internet Technologies
Gdańsk, Poland
Only remote
Bachelor in Computer Science, specialisation: Internet Technologies

Profile attachments

CV_Krzysztof_Slosarz.pdf

Secure Shell (SSH)PHPLAMP StackBootstrap (Software)Web DevelopmentLaravelPHP DevelopmentWooCommerceWordPressPHP FrameworksReact.jsBackendBackend ProgrammingFull Stack DevelopmentFront End Software DevelopmentWebhooks
Backend Development (PHP, Laravel, WordPress)
Expertise in PHP 8, Laravel and WordPress including custom plugin development, REST API integration, WooCommerce, MySQL and SQLite. Over 12 years of experience building and modernising complete web applications.

Frontend Development (React, TypeScript, Inertia)
Proficiency in React, TypeScript, Inertia, JavaScript, HTML, CSS, Tailwind CSS, Bootstrap and Astro. Building modern, performant frontend interfaces for web applications.

AI-Assisted Development (Claude Code, MCP, LLM APIs)
Daily use of Claude Code with project rules, skills, hooks and subagents. Integration of MCP servers and LLM APIs into development workflows and internal tooling.

Payment Integrations (Stripe, PayU)
Integration of Stripe and PayU payment gateways in multiple WooCommerce and SaaS projects, including subscription billing with webhooks.

Quality Assurance and Testing
Use of PHPStan, Pest and Playwright for static analysis and automated testing. Implementation of GitHub Actions CI pipelines and code security reviews as fixed quality gates.

Linux Hosting and DevOps
Management of Linux hosting environments via SSH, handling deployments, performance optimisation and technical SEO across multiple servers.

Third-Party Integrations and Automation
Experience with REST APIs, webhooks, data imports, web scraping and automation. Integrations include HubSpot API, supplier order and delivery APIs, and live data feeds.

Security and Vulnerability Management
Conducting vulnerability audits, patching and incident diagnosis for client platforms. Author of WPCoderScan, an open-source static security scanner for WordPress plugin code.

SaaS Product Development
Development of DamiBook, a multi-tenant booking SaaS for beauty salons built with Laravel 12, Inertia, React 19, TypeScript and subscription billing via PayU webhooks.

Languages

GermanBasic knowledgeEnglishFluentPolishNative speaker

Project history

Lead Developer, Spoti Platform

eTechnologie Sp. z o.o.
Lead developer for the Spoti corporate e-learning platform on WordPress and MasterStudy LMS. Responsible for custom plugins, releases and deployments across 12 servers. Led two application rewrites (scholarship management and programme management) using Laravel 13, Inertia, React 18 and TypeScript. Handled security patching, vulnerability audits and built MCP servers connecting Claude to the company CRM and LMS.

Co-owner, Managing Director and Lead Developer

WPCODER sp. z o.o.
Co-owner and lead developer of a software company in Poznan, Poland. Delivered websites, WooCommerce shops and web applications for clients in Poland and Ireland. Projects include rebuilding figura.team into a headless Astro site with 182 location pages and developing miliholicy.pl with a custom cart and checkout for several hundred concurrent users. Stripe integrations in multiple WooCommerce projects.

Web Developer

VIMAR Digital Marketing Ltd
Agency developer for an Irish digital marketing company. Built websites, WooCommerce shops and integrations for clients mostly in Ireland. Developed The Vaults Group booking app on WordPress with push notifications, live on App Store and Google Play since 2022. Integrations include HubSpot API, live gold prices and charts, and supplier order and delivery APIs.

Freelance Web Developer

Own business (sole proprietorship)
Freelance web developer building websites and online shops on WordPress, WooCommerce and PrestaShop for clients in Poland and abroad. Custom themes and plugins, page speed optimisation and on-page SEO.

Technical Manager, Web Developer and Designer

SAMODULSKI GROUP
Technical manager, web developer and designer at SAMODULSKI GROUP.

Web Developer and Technical Manager

sales-care.com
Web developer and technical manager at sales-care.com.

Front-end Developer

Ziajka.com
Front-end developer at Ziajka.com.

Web Developer

PinkParrotMedia
Web developer at PinkParrotMedia.

Web Developer

Various clients
Individual website projects on a contract basis.

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