Java Backend Engineer — Hybrid, Growth & Impact

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.

• 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 develope...