Scalable Systems Development: Worked on the design and implementation of high-performance, scalable systems for multiple Fiscal Data Operator projects. Ensured reliability and efficiency in processing large volumes of financial transactions, building fault-tolerant applications to handle critical business needs.Legacy System Optimization: Led efforts to optimize and refactor legacy services, achieving substantial improvements in performance, reducing technical debt, and enhancing the maintainability of existing systems.UI/UX Modernization: Rebuilt and modernized user interfaces from old template style, focusing on creating intuitive, responsive designs that significantly improved user experience and engagement.Cross-Functional Collaboration: Collaborated with product managers, designers, and developers in an agile environment, delivering high-quality products on time through effective teamwork and communication.Performance Optimization: Identified and optimized key bottlenecks in critical areas, including report generation, ticket queue processing, and database queries. These optimizations led to significant performance improvements, reducing latency and increasing system throughput.Code Quality & Best Practices: Implemented best coding practices, including code reviews, testing, and continuous integration, to ensure the delivery of high-quality, maintainable code and prevent future issues.

Project Development & Full-Stack Transition: Led the development of commercial projects using the React/NestJS stack, initially focusing on backend development before transitioning to full-stack responsibilities. Key projects include:- Eloboss: Led the update of the account store and participated a comprehensive redesign of the administrative interface.- B2B No-Code Parsing: Developed a robust solution for no-code parsing of complex websites.- CRM System Integration: Collaborated with the frontend team on the it-brains project, successfully integrating a CRM system to streamline operations.Mentorship & Leadership: Provided mentorship to students in it-brains school, guiding several students on Node.js and React.Code Architecture & Best Practices: Played a pivotal role in standardizing the backend code architecture across company projects. Championed the implementation of SOLID principles and clean code best practices, significantly enhancing code quality and maintainability.Process Improvement: Actively participated in creating and refining processes to introduce architectural standards company-wide, ensuring consistency and scalability in development practices.

Developing and maintaining QDIS' internal portal based on Java Spring, including creating a fully functioning API for the article and authorization system.Worked on DevOps tasks such as creating CI/CD pipelines and repository management to ensure efficient software development and delivery process.Also worked on the microservice architecture on the test server, which was the basis for the transition to microservices of the existing monolithic project.