Real-Time Event Processing System

Production-grade real-time event processing system built with NestJS and TypeScript, processing high-throughput events via Redis pub/sub with ZeroMQ (PiSub) and integrating with external APIs using HMAC-SHA256 authentication. Implemented exponential backoff retry logic, batch processing, and database-driven validation for high-throughput event processing. Designed resilient microservices architecture with Prisma ORM and PostgreSQL, featuring early filtering mechanisms for query optimization, comprehensive error handling, and automated lifecycle management, achieving 99.9% system reliability under high-load scenarios. Implemented real-time monitoring and observability with distributed tracing and performance metrics to track system health and execution latency across all microservices.