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.

Requirements:
• 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.