Grzegorz Krajewski
De: Poland
Ubicación: Warszawa, PL
En Useme desde 24 marzo 2026
Sobre mí
I’m a full-stack developer with 10+ years of commercial experience. My strongest area is backend development in PHP, mainly with Symfony and Laravel, but I also work on the frontend with HTML, CSS, and React, which allows me to deliver and improve web applications end-to-end.
I support clients both in new projects and in existing systems that need further development, refactoring, cleanup, or performance improvements. I build and maintain backends, APIs, third-party integrations, and solutions based on SQL and NoSQL databases, Redis, Elasticsearch, and queue-based processing. I also work with Python, mainly using FastAPI.
I usually help with:
web application development, API design and integrations, backend development in PHP and Python, frontend implementation in HTML, CSS, and React, refactoring existing systems, performance optimization, SQL and non-relational databases.
I value clean code, clear communication, and solutions that remain stable and maintainable after delivery.
CV / Currículum
Ene 2012 - Ahora
Freelance / software house / commercial client
Freelance / software house / klient komercyjny
* development of web applications and backend systems in PHP (Symfony, Laravel) * building and maintaining REST APIs * frontend implementation and development in React, HTML, and CSS * integrations with third-party services * working with SQL
Portafolio
Backend and REST API
Backend and REST API development for a web application. I was responsible for business logic, endpoint structure, database integration, and preparing the solution for further development, maintenance, and optimization.
Third-party system integration
Integration of a web application with external API-based services. The project included requirements analysis, communication implementation, error handling, and stabilizing data flow between systems.
Backend service in Python / FastAPI
Development of a backend service in Python using FastAPI. The scope included business logic implementation, API endpoint development, database integration, and preparing the solution for further growth and deployment.
React admin panel
Implementation and development of an admin panel in React. The work included building views, API integration, forms handling, data validation, and improving the structure of components and interface flows.
Symfony refactoring and optimization
Refactoring and optimization of an existing Symfony application. I was responsible for analyzing problematic areas, improving application logic, optimizing processes and queries, and increasing code readability.
Full-stack web application development
Full-stack web application development. I was responsible for the PHP backend and the frontend built with React, HTML, and CSS. The scope included business logic, API integration, database work, and further system architecture development.