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

Bank Julius Bär & Co. Ltd.; Comunidad de Madrid; On-site; EUR 55,000 - 90,000; Full time

Job summary

Bank Julius Bär & Co. Ltd. in Madrid seeks a skilled Java Backend Engineer to develop, enhance, and maintain a critical enterprise platform built on Java/Jakarta EE.

You will work with cross-functional teams to deliver robust backend and frontend solutions and ensure quality through automated testing. The role emphasizes REST API design, Oracle database work, performance tuning, and strong collaboration within Agile squads.

Qualifications

• Strong hands-on Java development experience.
• Experience with Java/Jakarta EE, JPA/Hibernate, and Maven-based apps.
• Experience building and consuming RESTful APIs.
• Working knowledge of Oracle databases, SQL and data persistence concepts.
• Understanding of software design principles and design patterns.
• Experience with automated testing (JUnit, Mockito).
• Familiarity with source control and collaborative workflows.
• Strong problem-solving and collaboration in Agile teams.
• Good communication and team-oriented mindset.
• Ability to work across backend and frontend in a full-stack capacity.

Responsibilities

• Develop and maintain backend applications using Java 21, Jakarta EE, JPA/Hibernate, and Maven.
• Design and implement REST APIs and integrate with internal/external systems.
• Contribute to enterprise integrations using SOAP, JMS, and messaging tech.
• Collaborate with product owners, analysts, and architects to translate requirements into technical solutions.
• Develop Oracle-based data models, queries, and performance improvements.
• Write clean, testable code following engineering standards and best practices.
• Create and maintain unit/integration tests and ensure test coverage.
• Troubleshoot defects, performance issues, and production incidents.
• Contribute to observability, monitoring, and continuous improvement initiatives.
• Support deployment, testing, and release activities across environments.

Skills

Java development

Jakarta EE

JPA/Hibernate

REST APIs

Oracle SQL

Software design principles

Unit testing

Mockito

Source control

Agile

Full-stack

Communication

Tools

JUnit

Mockito (tool)

Job description

At Julius Baer, we celebrate and value the individual qualities you bring, enabling you to be impactful, to be entrepreneurial, to be empowered, and to create value beyond wealth. Let’s shape the future of wealth management together.We are seeking a skilled Java Backend Engineer to join our team in Madrid. In thisrole, you will contribute to the development, enhancement, and maintenance of abusiness-critical enterprise platform built on Java/Jakarta EE technologies.You will work closely with Technical Leads, Product Owners, QA engineers, and other development teams to deliver high-quality software solutions across both backend and frontend domains. The ideal candidate is passionate about softwareengineering, enjoys solving complex problems, and is comfortable working acrossthe full technology stack.YOUR CHALLENGE• Develop and maintain backend applications using Java 21, Jakarta EE, JPA/Hibernate, and Maven.• Design and implement REST APIs and integrate with internal and external systems.• Contribute to enterprise integrations using SOAP, JMS, and messaging technologies.• Collaborate with Product Owners, Business Analysts, and Architects to understand requirements and deliver technical solutions.• Develop database-related functionality using Oracle, including data modelling and query optimization.• Write clean, maintainable, and testable code following established engineering standards and best practices.• Create and maintain automated tests, including unit and integration tests.• Troubleshoot and resolve application defects, performance issues, and production incidents.• Contribute to application monitoring, observability, and continuous improvement initiatives.• Support deployment, testing, and release activities across development and test environments.YOUR PROFILEMust-Have Skills• Strong hands-on experience with Java development and object-oriented programming principles.• Experience with Java/Jakarta EE, JPA/Hibernate, and Maven-based applications.• Experience building and consuming RESTful APIs.• Working knowledge of Oracle databases, SQL, and data persistence concepts.• Understanding of software design principles, design patterns, and clean coding practices.• Experience with automated testing using frameworks such as JUnit and Mockito.• Familiarity with source control systems and collaborative development workflows.• Strong problem-solving skills and ability to analyze complex technical issues.• Ability to work effectively within Agile development teams.• Good communication skills and a collaborative mindset.• Ability to work across both backend and frontend domains in a full-stack capacity.Nice-to-Have Skills• Experience with JBoss EAP, WildFly, or other enterprise Java application servers.• Familiarity with OpenAPI Generator, REST API design, and contract-first development.• Experience working with SOAP/JAX-WS, Apache CXF, or enterprise integration technologies.• Exposure to messaging platforms and JMS-based solutions.• Experience with Splunk, OpenTelemetry, or application monitoring solutions.• Familiarity with integration testing frameworks such as Kotest or Ktor.• Exposure to Docker-based local development environments.We are looking forward to receiving your full job application through our online application tool.