Backend Engineer

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

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