Overview We are looking for a Senior Java Backend Engineer to 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. Responsibilities
* Build 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 OpenShift 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 (OpenShift, Azure).
* Familiarity with PostgreSQL, 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 level Mid-Senior level Employment type Contract Job function Software Development

📌 Senior Java Backend Engineer (Barcelona)
🏢 Shakers
📍 Barcelona