Patryk Vizauer

PHP Backend Developer from Poland


I offer advanced and professional backend development for websites, approaching each project with individual attention and care. From e-commerce systems and payment providers to hosting platforms, forum systems, and much more.

For over 7 years, I’ve been developing web applications, focusing primarily on backend solutions for websites.

Work Experience

SimPay.pl logo

SimPay.pl

may 2024 - current

  • Led the implementation of BLIK refund functionality, as well as BLIK Level 0 and BLIK "Pay Later" payment methods, ensuring smooth integration with external payment APIs.
  • Conducted a comprehensive refactor of the existing systems — improving performance, readability, and maintainability across the entire codebase.
  • Identified and eliminated technical debt, redesigned legacy components, and introduced coding standards to enhance long-term project scalability.
  • Tasked with integrating additional payment solutions including Paysafecard, Skrill, and PagSeguro, adapting to each provider's specific API requirements and security protocols.
  • Built reusable backend components and services to support faster development of new features and reduce code duplication.
  • Optimized backend performance by reducing redundant logic, introducing caching strategies (e.g. Laravel cache, Redis), and improving data flow between services.
  • Refactored complex SQL queries, optimized Eloquent relationships, introduced eager loading, and added indexing to improve database query performance.
  • Applied Laravel best practices such as Service pattern, custom request validation, and clean controller logic separation.
  • Implemented a multi-currency support system, enabling dynamic currency conversion and accurate transaction handling across different regions.
  • Designed and developed all new features following SOLID principles to ensure clean, modular, and maintainable code architecture.
JunakPodkarpacie.pl logo

JunakPodkarpacie.pl

  • Developed a complete listing platform for motorcycles, quads, scooters, and mopeds using Laravel, including a custom-built backend system for managing offers, users, and content.
  • Designed and implemented an advanced admin panel with features such as filtering, status management, image galleries, and role-based access control.
  • Ensured scalability and maintainability by applying Laravel best practices, modular architecture, and clean code principles throughout the system.
  • Integrated SEO-friendly URLs, dynamic category structures, and custom validation rules to enhance both user experience and platform performance.

MielecNieruchomosci.pl

  • Built a real estate listing and management platform using Laravel, supporting the creation and display of property offers such as apartments, houses, and commercial spaces.
  • Developed a feature-rich admin panel allowing agents and admins to manage listings, upload property galleries, set pricing, and define location details via an intuitive interface.
  • Implemented advanced filtering and search functionality, including parameters like location, price range, property type, and availability.
  • Ensured data consistency and clean architecture by following Laravel conventions, applying SOLID principles, and separating business logic into dedicated service layers.

SpaceIs.pl

dec 2020 - jul 2024

  • Designed and developed spaceis.pl, a complete Laravel-based ItemShop platform for Minecraft servers, enabling server owners to sell virtual items, ranks, and services to players.
  • Built a dynamic and modular admin panel for managing servers, offers, payments, discount codes, users, and purchase history.
  • Integrated multiple payment operators including SimPay and CashBill, supporting SMS payments, bank transfers, and online gateways via robust API integrations.
  • Developed a secure, documented REST API for seamless integration between the platform and Minecraft servers, enabling real-time delivery of purchased items.
  • Implemented features such as webhook handling, purchase verification, order queuing, and retry mechanisms to ensure reliable transaction processing.
and many more...