Golang Developer

Developed scalable backend services in Go (Gin framework, REST/gRPC). Designed OpenAPI specifications with automated code generation (Swagger). Defined and implemented core business logic. Performed SQL query optimization for high-load PostgreSQL database. Wrote automated tests with 80%+ coverage (unit and end-to-end). Integrated external payment gateways. Conducted code reviews and ensured code quality as feature owner.

Led a cross-functional team of 20+ people. Developed a contextual advertising management system with multiple modules, including end-to-end analytics, dynamic call tracking, machine learning models for offline conversion prediction, a smart call routing system for call center operators, and others. Deployed the solution on AWS, using PHP, Go for the backend and Python for ML.

Implemented ML models for offline conversion prediction. Developed a smart call routing system for call center operators. Contributed to system architecture. Feature selection, hyperparameter tuning, cross-validation, model evaluation. Used Python, Pandas, and Airflow for data processing; Figma for prototyping.

Developed a high-performance SOCKS5 proxy service. Implemented clustering of network gateways for client proxy servers. Achieved over 100,000 active concurrent connections. Tuned performance at the OS level using Linux kernel features.

Built a vertical search engine for the healthcare domain (medspravka.ru). Developed a web crawler to collect documents from medical websites. Implemented text storage, indexing, and query processing.