Marcin Stanczyk

Deliver end-to-end web applications for clients using React, TypeScript, .NET, and WordPress, from architecture through deployment. Architect API integrations and automation workflows (n8n, webhooks, REST APIs) that reduce manual operations for e-commerce and service businesses. Build and maintain cloud infrastructure on Hetzner with OpenLiteSpeed, Redis, OPcache, and multi tier automated backup systems. Implement CI/CD pipelines, Docker containers, and modular codebases for long-term maintainability. Key skills: ⚛React TypeScript PHP REST APIs ☁Firebase Docker CI/CD Linux/Hetzner

—

Built and operate a WooCommerce toy store generating 100–150K monthly visits, specializing in wooden and Montessori toys for the Polish market. Manage Facebook Ads campaigns with 9+ ROAS at 1000–1200 PLN daily budgets, driving consistent profitable growth. Migrated infrastructure from shared hosting to a Hetzner CX53 VPS (16 vCPU, 32GB RAM) with OpenLiteSpeed, Redis object caching, and OPcache — cutting page load times significantly. Developed custom PHP plugins and cron jobs for automated order processing, stock synchronization, supplier integrations, and email workflows. Built n8n automation pipelines for invoice generation (inFakt API), conversion tracking, and operational reporting. Improved SEO structure and Core Web Vitals, increasing organic visibility and sales.

Developed ERP systems and ASP.NET MVC applications with custom navigation editors, dashboards, and role-based access control. Refactored backend APIs to CQRS pattern using MediatR, improving maintainability, testability, and response times. Introduced React Query, Zodios, and TypeScript on the frontend, modernizing data fetching and type-safe API consumption. Built reusable tools: File Managers, Form Creators, and recursive CRUD interfaces for complex nested data structures. Integrated DevExtreme UI components for data-heavy enterprise interfaces.

Key skills: ⚛React TypeScript ⚙.NET CQRS MediatR ⚙DevExtreme SQL

—