Backend development for a large-scale, high-traffic online platform utilizing a microservices architecture. Led the design, implementation, and maintenance of the payment system, a mission-critical component responsible for handling deposits, withdrawals, and refunds. Managed over 200 simultaneous integrations with various payment providers and gateways, ensuring secure and seamless financial transactions. Designed a robust multi-currency system and dynamic commission structures to optimize revenue and efficiency. Engineered an advanced game ranking system, tailoring recommendations by country, category, and provider. Led the integration team (4 developers) while collaborating within a 20-member tech team (16 developers, 4 DevOps engineers) across four specialized teams. Oversaw the orchestration and operation of 20 distinct microservices, ensuring high availability, scalability, and system resilience.

I played a significant role in the development and execution of a strong CRM system that was customized to satisfy the unique requirements of a company. I successfully delivered a high-performance system within the project timeline, exceeding stakeholder expectations. Led the architectural design and development of a comprehensive system within a dedicated team. In order to guarantee effective data management and integrity, was built and implemented intricate database schemas and models using PostgreSQL. To provide critical insights for debugging and performance monitoring, was implemented an effective logging and configuration management system using MongoDB. Using NestJS as the primary framework, I developed the CRM application, leveraging its capabilities to create a scalable and maintainablecodebase. Modular architecture to facilitate ease of development, testing, and deployment.

Developed and maintained high-performance APIs, support and implement new features in an international prestigious service. Optimized back-end systems written in TypeScript, resulting in increased performance, reliability and scalability. Expanded app's international presence, increasing user base by 30% by launching in 5 new countries. Developed a new feature, self-service checkout API for many countries with separate requirements. Collaborated with clients to gather requirements and translate them into actionable software solutions. Worked closely with cross-functional teams to deliver timely and accurate software updates. Worked in international teams with full communication in English

Developed and maintained API services for various web/mobile games with multiple clients: Focused on developed REST API that provide secure endpoints for game-related functions with Python. Implemented encryption and other security measures to protect player data and prevent cheating or hacking attempts. Created multiple types of registration and authorization in games e.g. via email, Google, Meta and MetaMask accounts. Initialized in-game currencies with Web3.0 using MetaMask. Collaborated with the team on Agile methodology with two week sprints.