Quality & Reliability

End-to-end digital transformation and tech solutions

Backend Developer

Backend EngineeringConfirmed live in the last 24 hours

Full-timeAthens, GreeceNo salary listedHybrid

About the Job

Requirements

A bachelor's degree in Computer Science or a related field, a master's degree as a plus, or equivalent professional experience.
At least 4 years of backend development experience with Java 11 or 17 and later versions.
At least 2 years of hands-on experience with Spring Boot, SQL using Oracle or PostgreSQL, JPA/Hibernate, Maven, and Git.
A solid understanding of object-oriented design, design patterns, SQL optimization, indexing, and test-driven development practices.
Familiarity with Agile/Scrum methodologies, CI/CD tools such as Jenkins and Bitbucket Pipelines, and security best practices.
Strong analytical, problem-solving, communication, and teamwork skills, with an organized, adaptable, and continuous-learning mindset.
Strong English communication skills.

Responsibilities

Design, develop, and maintain secure, high-quality backend services and applications for enterprise projects.
Implement and optimize Spring Boot-based Java backend solutions, ensuring clean, secure, and efficient code.
Contribute to reusable libraries, peer code reviews, automated quality checks such as SonarQube, and database optimization using Oracle or PostgreSQL.
Write and maintain unit tests using JUnit and Mockito, follow test-driven development principles, and document backend development.
Collaborate with front-end, quality assurance, and senior developers, and participate in stand-ups, retrospectives, and knowledge-sharing sessions.
Assist in product releases, ensure compliance, and resolve backend issues to maintain smooth system operations.

Desired Qualifications

Exposure to AI-assisted development tools, large language model technologies, and front-end frameworks such as ReactJS.

Backend Developer

Quality & Reliability S.A. (QnR) · Athens, Greece (Hybrid) · Full-time · Posted 2026-09-29

Workplace: hybrid

Department: Back End Team

Description

Are you a Backend Developer? Think bigger about your next move!

Build your future with QnR Group.
JOIN THE NEXT EUROPEAN TECHNOLOGY POWERHOUSE 🚀

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

Apply

Apply at Quality & Reliability S.A. (QnR)

About the Company

Quality & Reliability

End-to-end digital transformation and tech solutions

Quality & Reliability (QnR) Group is a European technology group delivering mission-critical digital transformation and advanced technology solutions across Greece, Europe and the broader EMEA region. It combines eight specialized companies into an integrated ecosystem to provide end-to-end solutions by coordinating AI, cybersecurity, cloud, ERP, IoT, asset management, maritime and defence tech for governments, financial institutions and other enterprises. It differentiates itself through strategic acquisitions, cross-company collaboration, and a focus on regulated industries that require multi-disciplinary delivery beyond single-vendor offerings. Its goal is to become a leading European technology powerhouse by acquiring, integrating, innovating and scaling to deliver lasting value, resilience and competitive advantage for clients across Europe, the Middle East and Africa.

Company size: 51-200
Company stage: Not listed
Total funding: Not listed
Headquarters: Greece
Founded: 1992

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