iGaming / Sportsbook / Online Casino | Senior Java Backend | Kafka or Rabbit MQ | Hybrid in Madrid. Ideally with experience in payments, iGaming/Gambling or FinTech (integrations and payments gateways) My client in the iGaming industry (online Casino and Sportbooks) is looking for a Senior Java developer , to work hybird from Madrid (3 days in the office, 2 days remote).

Role Overview We are looking for a Senior Java developer to build and scale core platform services in a distributed, event-driven environment. The role focuses on designing reliable, high-performance systems, including APIs, asynchronous workflows, and distributed transactions. You will ensure system resilience, data integrity, and observability while contributing to testing, security, and CI/CD practices.

Collaboration with engineering, DevOps, and compliance teams is key to shaping architecture and maintaining high standards across performance,



scalability, and reliability. 8+ years of experience with Java, 5+ of experience with Spring, Springboot and Microservices ~1+ years of experience within the payments, iGaming or FinTech industry ~2+ years of experience with Kafka or RabbitMQ. Develop and maintain core backend services (identity, transactions, data integrity) within an event-driven architecture. Build reliable, asynchronous workflows and high-performance APIs with proper versioning and consistency guarantees.

Implement distributed transactions, concurrency controls, and resilience patterns to ensure system stability and correctness. Manage database evolution, security (auth/authz), testing, and observability across services.

📌 Senior Software Engineer - C# - (Hybrid Remote) (Madrid)
🏢 Pentasia
📍 Madrid