Full stack developer

At SII Group Spain, we are looking for an experienced Full Stack Developer (ReactJS & Java) to join our team in Barcelona. Ready to take your development career to the next level in an international environment? You'll definitely want to hear about this opportunity! We are a French multinational company providing IT services and solutions worldwide, with a presence in 21 countries and more than 16,000 professionals. Our mission is to create innovative projects that make our clients’ lives easier, hiring the best professionals and ensuring that they feel fully fulfilled in their work.

• Develop, maintain and enhance full-stack applications using ReactJS, Java 21 and Spring Boot 4.x.
• Contribute to the progressive modernisation and migration of existing applications towards a new architecture based on ReactJS and Spring Boot.
• Analyse existing applications and translate their functional and technical requirements into new solutions.
• Collaborate with business stakeholders and technical teams to clarify requirements and define the best implementation approaches.
• Design, develop and maintain REST APIs and integrations between different systems.
• Work within a team evolving towards Agile methodologies, Software Craftsmanship and DevOps practices.
• Contribute to the implementation of AI tools and AI-assisted development solutions to improve applications and deliver a more personalised customer experience.
• Monitor production environments, ensure application stability and troubleshoot technical issues.
• Apply and promote clean code, TDD and software quality best practices.
• Actively contribute to the team's continuous improvement culture by sharing knowledge, exchanging ideas and challenging existing approaches.
• Participate in technical discussions, provide constructive feedback and help the team continuously improve its development practices.
• Ensure the quality, reliability and maintainability of the applications throughout their lifecycle.

• Higher vocational training (HES, federal diploma, EPF) or a university degree in Computer Science, Software Engineering or a related field, or equivalent qualifications.
• At least 5 years of experience in Full Stack application development using ReactJS and Spring Boot.
• Strong knowledge of ReactJS and modern frontend development.
• Strong knowledge of Java 21 and Spring Boot 4.x.
• Proven experience developing and maintaining REST APIs.
• Extensive experience working with Git.
• Experience with AI-assisted software development and AI-powered development tools.
• Practical knowledge of Kubernetes in a DevOps environment.
• Strong understanding of Software Craftsmanship principles, including clean code, TDD and software quality best practices.
• Excellent analytical and problem-solving skills, particularly when analysing existing applications and translating their functionalities into new architectures.
• Strong communication skills, openness to constructive feedback and a collaborative, team-oriented mindset.
• A proactive attitude, autonomy and a strong willingness to share knowledge and continuously improve.
• Native-level French is required.
• Будет плюсом: Knowledge of Python is a plus

• Permanent contract
• Relocation assistance: we give you full support to move to Barcelona.
• Personalised training for your professional growth 📚: access to Pluralsight and OpenWebinars, as well as Open Sessions to develop soft skills (Mindfulness, coaching, leadership).
• Working model: 60% remote, 40% office.
• Flexible benefits package: health insurance, meal vouchers, childcare support and transport tickets.
• International teams and environment 🌎
• We are a family: after-work events, team dinners and company gatherings 🥂