We're hiring: Senior Java DevelopersiGaming / Sportsbook / Online Casino | Senior Java Backend | Kafka or Rabbit MQ |Hybrid in Madrid.Salary: From €65k to €70k gross/year (DEO) + 10% bonusIdeally 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 OverviewWe 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.Skills & Experience8+ years of experience with Java, 5+ of experience with Spring, Springboot and Microservices1+ years of experience within the payments, iGaming or FinTech industry1+ years of experience with platforms integrations and payments gateway.2+ years of experience with Kafka or RabbitMQ.Key ResponsibilitiesDevelop 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.Contribute to internal tools, CI/CD, infrastructure, and leverage AI tools to enhance development efficiency.

📌 Senior Software Engineer (Madrid)
🏢 Pentasia
📍 Madrid