Dmitrii Velichko

- Developed and maintained high-load backend services for large-scale e-commerce systems - Worked with distributed microservices architecture across multiple business domains - Implemented asynchronous processing using RabbitMQ - Designed and maintained REST APIs and external service integrations - Applied Redis caching strategies to improve backend performance - Worked with ClickHouse and Elasticsearch for analytics and search functionality - Participated in CI/CD processes and deployment workflows

- Developed and maintained microservices-based backend systems - Designed and implemented REST APIs using Symfony and API Platform - Integrated third-party services and improved backend architecture - Applied event-driven architecture patterns and asynchronous workflows - Improved code quality using unit and functional testing - Optimized backend performance and database interactions - Worked with production services and business-critical systems

- Developed and maintained internal backend services and business features - Built messaging system for communication between users and support - Implemented notification services (web, email, messaging) - Designed access control and user permission mechanisms - Optimized backend application performance and database queries - Configured MySQL replication and improved system reliability - Worked with Symfony-based backend architecture and integrations

- Developed backend APIs for mobile applications - Integrated external services and third-party data providers - Refactored legacy Bitrix modules and migrated functionality to Symfony - Worked with REST APIs and backend integrations - Improved maintainability and performance of existing systems - Participated in backend architecture improvements

- Developed and maintained multiple commercial web projects - Implemented third-party integrations and external services - Optimized SQL queries and backend application performance - Configured caching mechanisms and improved system stability - Worked with backend APIs and database operations - Maintained and improved existing legacy systems

- Developed CRM backend functionality and internal business features - Integrated payment systems and third-party external services - Implemented reporting and analytics modules - Optimized SQL queries and application performance - Maintained and improved legacy backend code - Worked with REST API integrations and database operations