Middle Fullstack Engineer (Kotlin&React)

Xebia is a global AI-first, digital transformation, and engineering partner. With over 25 years of experience and a team of 5,000 professionals across 16 countries, we help organizations design and build scalable products, platforms, and data-driven solutions.

We specialize in Artificial Intelligence, Data and Cloud, Intelligent Automation, and Digital Products, combining deep technical expertise with a strong focus on engineering excellence and a people-first culture.

You will be:

• developing and enhancing microservices using Java and Kotlin,
• designing, developing, and modifying REST APIs and backend mocks,
• building web components, purchase flows, and registration processes using React,
• working across both backend and frontend areas, adapting to changing project needs,
• integrating solutions with external business partners and supporting partner-facing functionalities,
• collaborating with the team to deliver new features quickly and efficiently,
• contributing to the continuous improvement of the product and technical solutions.

Your profile:

• 3+ years of commercial experience in software development,
• good knowledge of Java and Kotlin,
• practical experience working with microservice architecture,
• hands-on experience with React and modern JavaScript,
• good knowledge of HTML and CSS,
• solid understanding of REST API design and consumption,
• practical experience working with JSON,
• willingness to work across both backend and frontend development,
• practical experience using AI-powered assistants (e.g. Claude Code, GitHub Copilot, Cursor) to improve productivity, quality, or decision-making in software delivery,
• ability to quickly switch between different technological areas and tasks,
• good communication and collaboration skills,
• English at min. B2 level,
• Polish at min. B1 level,
• openness to occasional visits to the Warsaw office (1-2 days per quarter).

• Work from the European Union region and a work permit are required.

Nice to have:

• experience with Docker and CI/CD processes, particularly GitLab CI,
• experience working with cloud environments,
• understanding of UX/UI principles,
• familiarity with Responsive Web Design (RWD),
• experience integrating with external partner systems,
• experience applying GenAI in a more structured way within the SDLC, including defined workflows, prompt patterns, or tool integrations embedded into daily work,
• interest in and familiarity with emerging AI-driven practices (e.g. agent-based workflows, automation patterns, AI-augmented development), with a willingness to explore and experiment beyond standard approaches.

Recruitment Process:

CV review – HR call – Technical Interview – Client Interview – Decision