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

Julius Baer; Madrid; On-site; EUR 70,000 - 95,000; Full time

Job summary

Julius Baer in Madrid seeks a skilled Java Backend Engineer to develop, enhance, and maintain our enterprise platform built on Java/Jakarta EE. You will work with leads, product owners, QA, and other teams to deliver robust software across backend and frontend domains.

The ideal candidate has strong Java/Jakarta EE experience, hands-on API design, and a passion for solving complex problems in a full-stack capacity. Madrid office-based role with collaboration across tech teams.

Qualifications

• Strong Java experience with OO programming.
• Proficient in Java/Jakarta EE, JPA/Hibernate, and Maven.
• Experience building/consuming RESTful APIs.
• Working knowledge of Oracle SQL and data persistence.
• Understanding of design patterns and clean code.
• Experience with JUnit and Mockito for tests.
• Familiarity with Git and collaborative workflows.
• Problem solving and analytical skills.
• Ability to work in Agile teams and communicate effectively.
• Full-stack capability across backend/frontend domains.

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 technologies.
• Collaborate with Product Owners, Analysts, and Architects to deliver technical solutions.
• Develop database-related functionality with Oracle, including data modeling and query optimization.
• Write clean, maintainable, testable code following engineering standards.
• Create and maintain automated unit/integration tests.
• Troubleshoot defects, performance issues, and production incidents.
• Contribute to monitoring, observability, and continuous improvement initiatives.
• Support deployment, testing, and release activities.

Skills

Java development

Jakarta EE

JPA/Hibernate

Maven

RESTful APIs

Oracle SQL

Software design principles

Automated testing

Agile development

Collaboration

Full-stack awareness

Tools

None

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 this
role, you will contribute to the development, enhancement, and maintenance of a
business-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 software
engineering, enjoys solving complex problems, and is comfortable working across
the 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 PROFILE

Must-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.