????????:SII Group Spain provides digital, IT, and engineering services and solutions to industries across the world.

It combines IT and software development expertise with manufacturing, systems, mechanical and electrical engineering, and embedded systems capabilities to support digital transformation and innovation.

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Participate in the gradual migration of applications from Java 8 to Java 25

Develop, fix, and refactor code to ensure compatibility with newer JVM versions

Identify and resolve incompatibilities caused by changes to the Java language and platform

Ensure temporary coexistence between Java 8 components and newer versions

Design and maintain the monorepository build architecture using Maven and Gradle

Manage cross-cutting dependencies and compilation scopes, and optimize build processes and pipelines

Lead the technical migration from Tomcat 8 to Tomcat 9 and Tomcat 10

Collaborate with Platform teams to align infrastructure and runtime environments





Support the transition to Jakarta EE and resolve related incompatibilities

Define the validation and regression testing strategy with QA

Participate in test automation and resolve issues during testing campaigns

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Extensive experience as a Java developer and on technology migration projects

Advanced knowledge of Java 8, 17, 21, and 25

Strong experience with Maven, Gradle, and Spring Boot

Excellent understanding of JVM internals and compatibility issues between versions

Experience with multi-module architectures and complex monorepositories

Extensive experience with Tomcat, especially migrations between versions 8, 9, and 10

Experience working in CI/CD environments

Analytical skills, autonomy, and ability to coordinate across technical teams

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Indefinite-term contract Geographic mobility opportunities and participation in large-scale international projects

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📌 Java/Spring Software Engineer (Barcelona)
🏢 Sii Group Spain
📍 Barcelona