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Software Engineer Java Specialist

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Arbeitsbeschreibung - Software Engineer Java Specialist

COSMOTE Global Solutions NV is looking for a skilled Software Engineer Java Specialist to join our dynamic ICT team. As a leading ICT Systems Integrator and a part of the OTE Group, we provide comprehensive ICT solutions and services to help our clients drive digital transformation.

Key Responsibilities:

  • Design, develop, and maintain Java-based software applications and components.
  • Collaborate with cross-functional teams to analyze requirements and translate them into scalable software solutions.
  • Implement best practices in software design, coding standards, and testing methodologies.
  • Contribute to the entire software development lifecycle, including architecture, development, testing, deployment, and maintenance.
  • Troubleshoot and resolve software-related issues and provide timely solutions.
  • Maintain up-to-date technical documentation and support knowledge sharing across the development team.
  • Stay current with emerging technologies and industry trends to recommend process and technology improvements.
  • Bachelor’s or Master’s degree in Computer Science, Software Engineering, or a related field.
  • 11+ years of professional experience as a software engineer working with Java, Jakarta EE / Java EE, and modern Spring Boot applications (Java 17; preferably Java 21 or higher), ideally contributing to migration or modernization scenarios.
  • Solid understanding of modern application architecture, including microservices, clean APIs, modular backend design, and frontend backend integration (React + Spring Boot).
  • Experience with relational databases, including legacy systems such as Sybase and modern targets such as Oracle, or MS SQL Server.
  • Strong knowledge of REST, SOAP web services, JMS, Unix shell scripting, Apache Kafka, and JSON based integration patterns.
  • Working knowledge of DevOps and CI/CD practices, particularly in modernization contexts (pipeline automation, quality gates, artefact promotion, deployment patterns).
  • Hands on experience with enterprise development and integration tooling:
      • Jenkins (build & deploy pipelines),
      • Maven (dependency & build management),
      • SonarQube (code quality & security scanning),
      • Liquibase (database schema migrations),
      • JUnit (backend unit tests),
      • GitHub (version control & pu l request workflows),
      • Azure Cloud & Azure DevOps (pipelines, repos, boards).
  • Understanding of SDLC methodologies, including Agile/Scrum and Waterfall.
  • Ability to work both independently and within a team migrating from legacy to modern stacks.
  • English proficiency at B2 CEFR or equivalent.

Preferred knowledge / experience:

  • Strong ability to analyze and understand complex legacy source code, map dependencies, determine migration paths, and align technical decisions with business objectives.
  • Experience with Spring Framework 6.x and Spring Boot 3.x (microservices, Actuator, Observability, native compilation optional).
  • Experience with JPA / Hibernate and migration of persistence layers to MS SQL Server.
  • Strong knowledge of JUnit/TestNG and mocking frameworks such as Mockito.
  • Familiarity with legacy and modern application platforms, including JBoss, Tomcat, Node.js, and Spring Boot.
  • Experience with integration technologies and event driven microservices, preferably using Apache Camel or Spring Integration.
  • Hands on experience with the Temporal workflow engine, especially for replacing legacy long running workflows or scheduling mechanisms.
  • Exposure to React/TypeScript frontend ecosystems or willingness to collaborate closely with React engineers during the modernization process.
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