More in detail, UST is a multinational company based in North America, certified as a Top Employer and Great Place to Work company with over 35,000 employees worldwide and presence in more than 35 countries. We are leaders in digital technology services, providing large-scale technological solutions to some of the world's most renowned organizations. We are seeking a highly skilled Senior Java Developer with extensive experience building scalable, high-performance distributed systems. You will join a talented engineering team responsible for designing, developing, and evolving mission-critical applications using modern Java, cloud-native architectures, and event-driven technologies. ⚙ Design, develop, and maintain robust backend services using Java 17/21 and Spring Boot. Develop and maintain gRPC APIs and Protobuf schemas, ensuring backward compatibility and proper schema evolution. Work with Kafka-based event-driven architectures and production-scale data stores. Create and maintain automated testing suites, including unit, integration, and contract tests.



Participate in troubleshooting, root cause analysis, and postmortem activities. Contribute to CI/CD pipelines, cloud infrastructure, and containerized deployments. 8+ years of professional experience with Java development. ~3+ years of hands-on experience with Java 17 or Java 21, including modern language features such as records, sealed classes, pattern matching, and virtual threads when applicable. ~ Strong expertise in Spring Framework and Spring Boot in production environments. ~ Proven experience with reactive programming using Project Reactor or RxJava (Mono, Flux, backpressure, retry strategies, hot vs. Solid testing practices using JUnit 5, Mockito, and AssertJ. ~ Experience developing integration tests against real dependencies and contract/parity testing. ~ Strong knowledge of Kafka consumer and producer semantics. ~ Redis, PostgreSQL, or MongoDB. ~ Cloud experience with AWS (or equivalent cloud platfor

📌 Senior Java Developer (Pamplona)
🏢 UST España & Latam
📍 Pamplona