Описание: 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.
Задачи:
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
Требования:
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
Условия:
Indefinite-term contract Geographic mobility opportunities and participation in large-scale international projects
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📌 Graduate Developer, Java Developer, Agile (Barcelona)
🏢 Sii Group Spain
📍 Barcelona