Server Technologies, Core Java, Design Patterns, Java 8, IO NIO, Java multi-threading, network communication, high availability systems, high concurrency

Mqtt, Logging, PostgreSQL, API design, Microservices, Redis, Docker, metrics, Kubernetes, AWS, asynchronous event-driven architectures, telemetry pipelines, tracing, ClickHouse, Go, incident debugging, distributed system patterns, alerting, end-to-end service validation, AI coding tools, NATS, real-time data processing, observability