Java Software Developer (f/m/d) Communication Platform in Karlsruhe

Job Description

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.

We build and operate the Hosting Communication Platform (HCP) and are currently developing the new Marketing Hub for the entire IONOS Group. Our microservice-based system enriches, generates, and delivers customer communications across email, SMS, push notifications, and letters. As a product-focused team, we are responsible for the evolution of our platform, the rollout across all IONOS brands, and the delivery of our new Marketing Hub ecosystem.

Tasks

• You will develop robust backend services usingJava with Spring Boot and play a key role in evolving the platform and rolling it out for new brands.
• You will collaborate closely with other development teams and bring new ideas to life with a pragmatic mindset.
• You will contribute to technical design and review processes, helping us keep the platform stable and performant with your experience.
• You have knowledge of frontend technologies likeReact to further develop our Marketing Hub.
• Optional: Do you have experience with PHP? Our communication editor is currently PHP-based. In parallel, we are working on new modules for ourMarketing Hub using React.
• You have solid experience in developing withJava and Spring Boot , and you’re comfortable working with APIs, distributed systems, and microservices.
• You embrace agile methodologies and enjoy collaborating with others. Communicating inEnglish and optionally German is something you’re comfortable with.

Application Note

We value diversity and welcome all applications – regardless of, for example, gender, nationality, ethnic or social origin, religion, disability, age as well as sexual orientation and identity, physical characteristics, marital status or any other irrelevant factor subject to applicable law.

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