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.

Solid understanding of OOP concepts, data structures, and server-side application development.

Experience with Git, basic Linux, and familiarity with the software development lifecycle.

Analytical and problem-solving mindset with attention to detail and a passion for modern backend technologies.

Collaborative, proactive learner with strong communication skills and a drive for continuous improvement.

Proficiency in English (both written and spoken).

Would be a plus:

Hands-on experience with NodeJS, Express or other backend frameworks.

Experience with GraphQL, databases (SQL or NoSQL), or containerisation (Docker/Kubernetes).

Awareness of AI technologies and their applications in backend systems and automation.

Familiarity with Agile methodologies.

What we offer:

The chance to learn and work with experienced professionals across marketing, analytics, and software development.

Guidance and coaching to support your learning journey.

Flexible working hours to fit your academic schedule.

Hands-on experience in real-world projects that impact millions of users.

Hybrid work options.

Potential for future career opportunities within our company.

Substitute days off for public holidays that occur on weekends.

Team events and networking opportunities promoting a creative and diverse culture.

Summerfest and Winterfest parties.

5 vacation days / 6 months.

And of course — coffee, soft drinks, and fresh fruits in the office!

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.