Standalone distributed rate limiting microservice. Token Bucket algorithm via atomic Redis Lua script, Resilience4j circuit breaker with fail-open, Micrometer metrics, and a Java SDK for one-dependency integration.
Event-driven fraud detection microservice built with Java 21, Spring Boot 3, Apache Kafka, Redis, and PostgreSQL. Consumes transaction events and evaluates them against a real-time rule engine.
Java 21 | Spring Boot 3 banking API. Double-entry ledger, idempotent transactions, optimistic locking, Redis caching, Kafka event streaming, distributed rate limiting, and async email via Job Queue.
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