Elk Stack, Kafka, Spring Boot, Microservices, Nosql, RDBMS, MySQL, AWS, Java, MongoDB, LangSmith, LangGraph, OpenAI Agents SDK, object-oriented development, LLM fundamentals, OpenTelemetry, guardrails, LangChain, agentic AI frameworks, CrewAI, cloud-native applications, AI safety, MCP Model Context Protocol, LlamaIndex, AI gateway architecture, LLM observability