Backend Developer

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Backend Developer | Quality & Reliability (QnR), the parent company of QnR Group

Role overview

We are looking for a Backend Developer to join Quality & Reliability (QnR) and design, develop and maintain secure applications. As a Mid Back End Developer, you will work on designing, developing, and maintaining high-quality backend services for enterprise projects. You will collaborate with cross-functional teams (e.g., Front-End, BA-QA) and be exposed to modern practices such as AI-driven automation to improve development efficiency and code quality. This position offers a unique opportunity to further develop your backend expertise in a dynamic and innovative environment.

About QnR Group

QnR Group is a technology group with 35 years of experience, 8 companies, 4 delivery centers and 210+ professionals across Greece, Belgium, Cyprus and Poland. Listed on the Athens Stock Exchange since 2000, we deliver mission-critical digital transformation projects for the public and private sector. The Group’s capabilities covers software engineering, enterprise and generative AI, cybersecurity, cloud infrastructure, SAP and ServiceNow solutions, core banking and maritime intelligence.

Requirements

What you'll work on:

• Develop & Maintain Java Services: Implement and optimize Spring Boot-based backend solutions, ensuring clean, secure, and efficient code
• Enhance Code Quality & Performance: Contribute to reusable libraries, peer code reviews, automated quality checks (e.g., SonarQube), and database optimization (Oracle, Postgres)
• Testing & Documentation: Write and maintain unit tests (JUnit, Mockito), follow TDD principles, and document backend development for clarity and maintainability
• Collaboration & Agile Practices: Work closely with Front-End, QA, and senior developers, participate in stand-ups, retrospectives, and knowledge-sharing sessions
• Support & Troubleshooting: Assist in product releases, ensure compliance, and resolve backend issues to maintain smooth system operations

What you bring:

• Bachelor’s degree in Computer Science or a related field (Master’s degree is a plus), or equivalent professional experience
• 4+ years of backend development experience with Java (11, 17+)
• 2+ years of hands-on experience with Spring Boot, SQL (Oracle/PostgreSQL), JPA/Hibernate, Maven, and Git
• Solid understanding of Object-Oriented Design (OOD), Design Patterns, SQL optimization, indexing, and TDD practices
• Familiarity with Agile/Scrum methodologies, CI/CD tools (Jenkins, Bitbucket Pipelines), and security best practices
• Exposure to AI-assisted development tools, LLM technologies, and front-end frameworks such as ReactJS is an advantage
• Strong analytical, problem-solving, communication, and teamwork skills, with an organized, adaptable, and continuous-learning mindset
• Strong English communication skills