Expert backend development, robust scalable architectures, and seamless digital transformations.
I'm Paweł Kaźmierczak, a senior software engineer and the person behind KAZCODE. For more than 16 years I've been building, improving and maintaining software used in real businesses — from SaaS and e-commerce to WordPress platforms and cloud-backed systems.
My work is backend-first, but never backend-only. I care about architecture, performance, reliability, deployment and the day-to-day experience of the people who have to maintain the system after launch. The goal is not simply to ship code — it is to leave behind software that stays understandable, fast and useful.
Selected experience
A selection of teams and technical environments that shaped how I build software today.
Online education / SaaS
Backend engineering for a production online-learning platform, with emphasis on maintainable domain logic, asynchronous processing and reliable infrastructure.
Custom web development
Custom WordPress engineering focused on purpose-built plugins, Gutenberg blocks and tailored solutions that fit real editorial and business workflows.
Cloud-backed e-commerce
E-commerce backend and cloud work spanning object storage, image processing, CDN delivery and caching — designed to improve performance and operational reliability.
Modern commerce
Magento development with modern storefront architecture, including PWA-oriented implementations and React-based commerce experiences.
WordPress Plugins
Offload and migrate WordPress media across Amazon S3, Cloudflare R2, and S3-compatible storage while keeping the native Media Library workflow.
Built for sites that need safer media storage operations: restore paths, remote verification, resumable transfers, and verified provider migration in Pro.
Free 1.3.0 / Pro 1.3.0
New technical articles are published in the WordPress storage guides.
Practical engineering work, from early architecture decisions through day-to-day performance and reliability.
Websites and web applications built to match your actual requirements, not adapted from a template.
Online stores built on Magento or WooCommerce, sized and optimized for real traffic and order volume.
Custom WordPress plugins, themes and integrations, with a focus on performance, maintainability and secure development practices.
Performance audits and fixes — faster load times, more efficient database queries, fewer structural bottlenecks.
Backend systems designed for maintainability, data integrity, security and predictable scaling.
RESTful and GraphQL APIs for connecting your systems with other applications and services.
Code and architecture reviews focused on maintainability, performance, security risks and technical debt.
Containerized environments and CI/CD pipelines for repeatable, reliable deployments.
A systematic methodology guaranteeing scalable and maintained results.
Analysis & Requirements
System Design & Planning
Coding & Implementation
Testing & Refining
Launch & CI/CD
Standalone tools built and maintained by KAZCODE.
Reliable cloud & object storage for WordPress. Offload, migrate, restore and verify Media Library files on Amazon S3, Cloudflare R2, and supported S3-compatible storage.
Available for freelance opportunities and consultations. Let's discuss your next project architecture and technical requirements.