- Scaled backend infrastructure for a high-load trading platform by redesigning asynchronous processing with Celery and Redis and implementing reliability and fault-tolerance testing, achieving 99.5% uptime and 10x higher system capacity. - Developed asynchronous pipelines for processing trading events and exchange orders with optimized I/O handling and resilient inter-service communication, reducing operation latency by 40%. - Migrated authentication infrastructure from session-based architecture to JWT with FastAPI and developed internal APIs and backend services for operational tooling and frontend integrations. - Designed and maintained REST API integrations with Binance, Deribit, BitMEX, OKX, and KuCoin, implementing retry mechanisms, error handling, and normalized financial data processing across multiple providers