Kafka, PostgreSQL, Redis, and Next.js/React frontends. Guide teams in implementing event-driven architectures using Kafka and RabbitMQ, ensuring consistency of AsyncAPI and OpenAPI contracts across polyglot services. Architect and review backend services primarily in Spring Boot (Java/Kotlin) with optional polyglot extensions (Go, Node.js, Python, Rust … code principles. Understanding of frontend architectures (React/Next.js, micro frontends, monorepos) and API integration patterns. Proficiency in API and event contract design using OpenAPI and AsyncAPI; knowledge of GraphQL federation is a plus. Strong background in observability, monitoring, and tracing , with Prometheus/Grafana/ELK or equivalent. ...