BE Software Engineer Working Student for Trinity Development & QA team (hybrid)

About IONOS At IONOS, we don't just manage servers – we shape the digital future for more than 6.2 million customers worldwide with our solutions. As Europe's leading hosting provider and a pioneer in independent cloud solutions, we are building next-generation infrastructure – from sovereign cloud architectures and high-performance GPU clusters to integrated AI automation tools. What drives us is digital sovereignty for Europe and real impact for small and medium-sized businesses (SMBs) as well as large enterprises. We work in agile teams, rely on transparent structures, and believe that excellence and innovation only emerge through true team spirit. Ready for your next step? Become part of IONOS and grow with us. About the team: Our department empowers small and medium businesses with AI-powered we.bsite builders and online marketing tools, enabling our customers to create first class websites online. We are customer-centric and design-driven, helping millions achieve their online presence dreams. Our product is built with JavaScript technologies, using TypeScript for both FE & BE development: React & Redux for the FE, NodeJS and Express for the BE and GraphQL to connect them. Our code is organized in monorepos and managed by PNPM. All web applications operate on a Kubernetes-like cluster, structured as microservices. We are looking for a working student to join our backend development team. You will benefit from hands-on guidance from an experienced BE mentor and get up to speed with our technologies and processes. If this resonates with you and you're eager to dive into the backend development world, continually enhance your skills and embrace new challenges, we'd love to meet you. Ready to make a difference and transform your career? Join our team and make an impact! About the Working Student program: This program is intended for students (currently enrolled in a bachelor’s or master’s program) who want to gain hands-on experience in data-driven online marketing and customer analytics. You will have the opportunity to apply what you learn in your studies and work on real-world marketing data and personalization projects that reach millions of users. Main responsibilities: As a BE Software Engineer Working Student, you will: Develop and maintain our backend services and APIs using TypeScript, NodeJS and Express. Implement new and expand existing features with clean, maintainable and high-quality code. Collaborate in an Agile team environment, participating in sprints, code reviews and technical discussions. Write and maintain unit and integration tests to ensure code reliability and performance. Learn how to write and keep technical documentation accurate and up to date with implemented changes. We appreciate: BS degree or currently studying in Computer Science, Engineering or equivalent. Strong knowledge and some experience with JavaScript, TypeScript, NodeJS and REST API design.…