Built a mobile application from scratch using React Native CLI, taking full ownership of the architecture, navigation, and native module integrations. Implemented Passkey authentication across both the mobile app and the .NET backend, providing a modern, passwordless login experience. Developed and scaled server-side logic focusing on building secure REST APIs and handling business logic. Contributed to the Vue.js web project, delivered new features and consistent user experience across the web and mobile ecosystems. Optimized app performance by refactoring state management.Collaborated on API design and documentation, bridging the gap between the backend services and the React Native frontend to ensure fast and reliable data fetching.

I developed an accounting application as a full stack developer. The backend was built with NestJS, implementing JWT authentication, WebSockets for real-time updates and progress tracking, and a REST API. The application was containerized using Docker, and I wrote extensive raw SQL queries for complex data operations. I also implemented Excel file parsing to import data into the system.The frontend was created with Next.js, utilizing shadcn/ui for UI components. The interface included numerous charts and spreadsheets for data visualization. I integrated Payload CMS to manage content and administrative interfaces.

I worked as a full stack developer on a proof-of-concept project where I built both the backend and frontend from scratch. The backend used NestJS, WebSockets for real-time features, Prisma as the ORM, and PostgreSQL as the database. I used AWS S3 with Postgres to store images and documents. The app ran in Docker containers behind Nginx.Authentication was implemented using Google OAuth2 combined with JWT access and refresh tokens. I used Redis to blacklist tokens and handle secure logout. The frontend was built with Next.js, with a focus on clean structure and responsiveness.The goal of the project was to validate the architecture and tech stack, so I kept the code modular, maintainable, and easy to extend.