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.
What We Do
COSMOTE Global Solutions, as a member of OTE Group of Companies, is an ICT Systems Integrator delivering a broad range of ICT Solutions and Services. CGS provides a broad range of ICT Services focusing on: Cloud, Data Centre operations, Networking, Cybersecurity, BI and Data Warehouse, Big Data, Service Desk, Proactive Monitoring, Operations and Support, Service Management, Project and Programme Management, and Professional Services. OTE Group: OTE Group is the largest technology provider in Greece. It is one of the top three listed companies with respect to capitalization, in the Athens Stock Exchange. Deutsche Telekom holds 46.9% of OTE’s share capital and the Greek State holds 5.6%. Find More about OTE Group Our Vision: We digitize societies so that everyone can live and enjoy at the fullest all possibilities offered now while also building on them for a better tomorrow. Our Mission: • We bring the best communication services to our customers • We connect people • We entertain • We help businesses grow. • We are leaders, pioneers, pillar of the economy and society • With passion, faith and commitment • We constantly strive to become better on all fronts • We have a positive impact on society and the environment
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