Principal Developer

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About Atos Group Atos Group is a global leader in digital transformation with c. 70,000 employees and annual revenue of c. € 10 billion, operating in 67 countries under two brands — Atos for services and Eviden for products. European number one in cybersecurity, cloud and high-performance computing, Atos Group is committed to a secure and decarbonized future and provides tailored AI-powered, end-to-end solutions for all industries. Atos is a SE (Societas Europaea) and listed on Euronext Paris.

The purpose of Atos is to help design the future of the information space. Its expertise and services support the development of knowledge, education and research in a multicultural approach and contribute to the development of scientific and technological excellence. Across the world, the Group enables its customers and employees, and members of societies at large to live, work and develop sustainably, in a safe and secure information space.

Principal Developer Wanted — Join an Aviation Tech Team!

Take your career to new heights — work on impactful solutions for a European client

Are you an experienced Java engineer ready for a new adventure? Do you want to work at the intersection of technology and aviation, developing innovative solutions in a truly international environment? We’re looking for a proactive, independent specialist to join our team supporting a major client from the aerospace industry.

Your Key Responsibilities

• Full-Stack Architecture & Development – Java, React, TypeScript. Lead the design and development of end-to-end solutions with a strong emphasis on Java backend services using Quarkus / Spring, while also developing modern, responsive frontend applications using React, TypeScript, and contemporary UI frameworks. Ensure architectural coherence across the entire stack.
• AI-Assisted Development. Champion the adoption and effective use of Claude Code and other AI-assisted development frameworks. Guide the team in prompt engineering, code review of AI-generated code, and best practices for integrating AI tools into the development workflow while maintaining security and quality standards.
• Backend Excellence. Architect and implement high-performance, scalable microservices and APIs using Java, ensuring code is maintainable, testable, and aligned with industry best practices. Drive technical decisions on backend architecture and patterns.
• Database Architecture. Design and optimize complex database solutions across MongoDB and PostgreSQL, including schema design, query optimization, indexing strategies, data modeling, and migration strategies to achieve exceptional performance and scalability.
• Event-Driven Architecture. Design and implement robust event-driven systems using Kafka, ensuring reliable message processing, event sourcing patterns, and seamless integration with monitoring solutions (ELK stack).
• Performance & Scalability Engineering. Identify, analyze, and resolve performance bottlenecks across the entire stack. Implement comprehensive performance monitoring, profiling, and optimization strategies.
• DevOps & CI / CD Leadership. Design and maintain CI / CD pipelines using Jenkins, integrate security scanning (SonarQube, Snyk, OWASP), manage artifact repositories (Nexus), and ensure deployment automation. Implement infrastructure-as-code and container orchestration strategies.
• Testing Strategy. Establish comprehensive testing strategies including unit, integration, end-to-end, performance, and security testing. Ensure high code coverage and quality gates throughout the pipeline.
• Security & Compliance. Implement and enforce security best practices across the full stack, including secure coding, authentication / authorization mechanisms, vulnerability management, secrets management, and compliance with industry standards.
• Technical Leadership. Provide technical mentorship to development teams, conduct code reviews, establish coding standards, and foster a culture of engineering excellence and continuous learning. Make critical architectural decisions and drive technical strategy.
• AI / ML Integration. Design and implement integrations with AI / ML services, LLM APIs, and intelligent automation features. Understand prompt engineering, model selection, and responsible AI practices.
• Stakeholder Collaboration. Work closely with product owners, architects, security teams, and business stakeholders to translate complex requirements into technical solutions. Communicate technical concepts effectively to both technical and non-technical audiences.
• End-to-End Ownership. Take complete ownership of complex features and systems from conception through design, implementation, testing, deployment, and maintenance. Drive initiatives independently with minimal supervision while ensuring alignment with team goals.

What We’re Looking For

Required Professional Attributes

Preferred Qualifications

What’s in it for you?

What happens next?

Here at Atos, diversity and inclusion are embedded in our DNA. Read more about our commitment to a fair work environment for all. Atos is a recognized leader in ESG criteria. Find out more on our CSR commitment. Choose your future. Choose Atos.

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