OverviewWe are looking for aSenior Java Backend Engineerto join a long-term freelance project in Barcelona (hybrid: 3 days onsite, 2 remote).This role is part of a strategic transformation initiative in the financial sector, modernizing data management systems with cloud-native technologies and agile methodologies.ResponsibilitiesBuild and optimize back-end services with Java 8+/11/21, Spring Boot, and Microservices.Translate complex business needs into scalable solutions.Improve GUI functionality in collaboration with frontend teams.Implement best practices in security, compliance, and governance.Work with Apache Kafka and Apache Spark for real-time data pipelines.Deploy and manage applications in Open Shift and Azure with Kubernetes and Docker.Collaborate in agile cross-functional teams (SCRUM,
SAFe).Provide technical leadership and mentor junior developers.7+ years of Java development (Java 8+, ideally 17/21).Strong expertise in Spring Boot, Microservices, REST APIs.Experience with Kubernetes, Docker, CI/CD pipelines.Cloud knowledge (Open Shift, Azure).Familiarity with Postgre SQL, Hibernate, distributed systems.Proficiency in Kafka and Spark for real-time streaming.Awareness of Angular and testing frameworks (JUnit, Jasmine, Karma).Previous work in financial services / trading platforms is a big plus.Seniority levelMid-Senior levelEmployment typeContractJob functionSoftware Development