Branislav Heger

Backend team lead on an event-driven case-management platform: Java 21, Spring Boot 3, Kafka (Avro, Schema Registry), Camunda 7, Oracle, Kubernetes/Helm, OpenTelemetry.

End-to-end delivery of an enterprise fleet-management system in an AI-first engineering environment (Spring Boot 3.5, Java 25, React/TypeScript). Clean architecture and domain-driven design; jOOQ for reads and JPA for writes, Flyway for schema versioning, Testcontainers for integration testing, Error Prone with NullAway for compile-time null safety. Multi-tenancy, OAuth2 SSO, Redis caching, RabbitMQ messaging, ShedLock scheduling, GCP Cloud Storage; containerised services on Kubernetes.

Loan-origination system for Erste Group (Česká spořitelna) in Kotlin, built on a hexagonal architecture that isolates the domain from transport. Legacy core-banking systems are integrated behind adapters; when they later migrated from SOAP to REST, the change stayed contained in the adapter layer with no impact on the domain. Kafka for asynchronous integration with the scoring, approval and fraud-prevention engines; REST API for the React frontend.

Designed and led the rebuild of a trading system from a monolith to an event-driven microservice architecture in Java, with integration flows on Apache Camel and classical Enterprise Integration Patterns. Core guarantee: never lose a trade. State is persisted at every processing step before forwarding (store-and-forward), so any service can crash and recover with no data loss. Services communicate through published events rather than direct calls; delivery is at-least-once with idempotent consumers, so each