Role: Java (Low latency patterns) +Springboot+Microservices+ Kafka +Hexagonal Architecture+Github/Claude Must-Have Skills : Java (Low latency patterns) +Springboot+Microservices+ Kafka +Hexagonal Architecture+Github/Claude Java 21 — ideally with experience of high-performance, low-latency patterns: lock-free data structures, primitive collections, allocation minimisation, single-writer principle IBM MQ — point-to-point and pub/sub messaging, persistent/non-persistent delivery, queue manager configuration, dead-letter handling Apache Kafka — producer/consumer patterns, manual offset commit, DLQ handling, at-least-once delivery, idempotent consumers Hexagonal architecture — strict ports & adapters layering, building new modules from scratch following established patterns Spring Boot 3.5 — auto-configuration, profiles, actuator, dependency injection, component testing Testing discipline — JUnit 5 + AssertJ + Mockito + WireMock, 100% line coverage, component test design Agentic coding (Claude / GitHub Copilot) — agentic/vibe coding, prompt engineering, writing AI context files, reviewing AI-generated code against coding standards, test-driven agentic workflows Desired Skills / Experience gRPC / Protobuf — schema design (proto3), Java stub generation, error propagation, intra-service communication CockroachDB or PostgreSQL — multi-region vs single-region replication trade-offs, schema migration tooling (e.g. Liquibase) LMAX Disruptor / ring buffer micro-batching architectures Chronicle Queue — low-latency inter-process messaging, appender/tailer patterns Envoy proxy / xDS — header-based routing, cluster/listener discovery, control plane integration RocksDB — embedded KVP store, point lookups on hot path Rust + WASM (Envoy proxy filter development) Micrometer / Prometheus observability (metrics, custom histograms) Resilience4j (retry with backoff, circuit breakers) Podman / Docker / Docker Compose (containerisation, shared-volume messaging) CI/CD pipeline authoring (Jenkins or equivalent)