Kafka, Spring Boot, Encryption, Rtp, Swift, Microservices, AWS, Sepa, Oauth2, Jwt, Redis, Gcp, Distributed Systems, Rest Apis, Azure, FedNow, Containerized solutions, distributed databases, Streaming platforms, Integration patterns, key management, Agile environments, Caching systems, Regulatory Compliance, Security Architecture, Payment system integration, Event-driven architectures