Developed user interfaces for e-commerce platforms and banking applications using React + Next. Built cross-platform mobile applications with Flutter. Participated in the full development lifecycle, from MVP to production release. Integrated REST and GraphQL APIs, including payment systems and banking services.

Frontend Engineer at Alten Polska

February 1, 2023 - February 1, 2025

Participated in frontend migrations from legacy architectures to modern stacks with modular architecture and a component-based approach. Designed and implemented frontend architecture, including layer separation, reusable components, state management, error handling, and data loading optimization. Integrated backend services and databases using REST APIs, GraphQL, and WebSocket. Optimized application performance and ensured cross-browser compatibility and responsive UI.

Full-Stack Engineer at N4BA

June 1, 2021 - March 1, 2023

Worked on the backend of a game project, implementing over 20 unique game events and systems using Node.js. Developed a complex user interface for the game client using React (Next.js, Redux Toolkit, Zustand, TypeScript, Tailwind CSS, Storybook). Introduced a unified approach to UI layout and component architecture, reducing development time by approximately 30% and improving interface consistency. Coordinated team efforts on integrating game logic and APIs, enabling the successful release of multiple major updates without regressions.

Frontend Engineer at Aretum

August 1, 2020 - May 1, 2021

Implemented a single-page application (SPA) architecture with a modular structure, reusable UI components, and state management via Redux. Configured and maintained the build pipeline using Astro, Vite, and Webpack, optimizing bundling and load performance. Set up CI/CD pipelines with automated builds, testing, and deployment. Designed centralized error handling and logging to improve application stability and observability.