Java Backend Engineer 100% (f/m/d)

Description

The company is in wealth management, and this role is a Java backend engineer position based in Madrid, working on a business-critical enterprise platform built on Java and Jakarta EE.

You will join a team that includes Technical Leads, Product Owners, QA engineers and other development teams, delivering software across backend and frontend work.

Responsibilities

• Build and maintain backend applications in Java 21 with Jakarta EE, JPA/Hibernate and Maven.
• Design and implement REST APIs, and connect them with internal and external systems.
• Help build enterprise integrations using SOAP, JMS and other messaging technologies.
• Work with Product Owners, Business Analysts and Architects to turn requirements into technical solutions.
• Build database functionality on Oracle, including data modelling and query tuning.
• Write clean, testable code that follows the team's engineering standards.
• Write and maintain automated unit and integration tests.
• Diagnose and fix defects, performance problems and production incidents.
• Help improve monitoring and observability, and take part in continuous improvement work.
• Support deployment, testing and release work across development and test environments.

Requirements

• Strong hands-on Java experience and solid object-oriented programming skills.
• Experience with Java/Jakarta EE, JPA/Hibernate and Maven-based applications.
• Experience building and consuming RESTful APIs.
• Working knowledge of Oracle, SQL and data persistence.
• Understanding of software design principles, design patterns and clean coding.
• Experience with automated testing using JUnit and Mockito, or similar frameworks.
• Familiarity with source control and collaborative development workflows.
• Strong problem-solving skills and the ability to analyze complex technical issues.
• Ability to work effectively in Agile teams.
• Good communication skills and a collaborative attitude.
• Ability to work across backend and frontend in a full-stack role.
• Nice to have: experience with JBoss EAP, WildFly or other enterprise Java application servers.
• Nice to have: familiarity with OpenAPI Generator, REST API design and contract-first development.
• Nice to have: experience with SOAP/JAX-WS, Apache CXF or enterprise integration technologies.
• Nice to have: exposure to messaging platforms and JMS-based solutions.
• Nice to have: experience with Splunk, OpenTelemetry or other application monitoring tools.
• Nice to have: familiarity with integration testing frameworks such as Kotest or Ktor.
• Nice to have: exposure to Docker-based local development environments.

Conditions

This is a 100% position based in Madrid.

Applications are accepted only through the company's online application tool.