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Software Engineer (f/m/d)

Ionos2

Karlsruhe (IONOS SE) Hybrid permanent

Posted: December 19, 2025

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Job Description

At IONOS, the leading European provider of cloud infrastructure, cloud services and hosting services, you will work together with a wide range of teams. We are characterized by open structures, a friendly working culture and flat hierarchies with a strong team spirit. We firmly believe that work and fun are compatible, and offer you the right environment for this. Our constant growth means that we are always looking for new colleagues. Become part of IONOS and grow with us.

Our team develops the IONOS Control Panel, which is used by thousands of customers every day to manage their products in the areas of email, domains, web hosting, websites, servers, office, and online marketing.

To realize our vision of a modern control panel, we are looking for you! If you are passionate about developing innovative web applications and have experience working with development teams, then you've come to the right place!

Tasks

• Continuous development of our customer platform through the targeted use of your strengths in programming complex web applications.

• Working in an interdisciplinary team to implement technical solutions using the latest technologies. You will support this with your pragmatic approach to finding solutions.

• Collaborating with our development team to develop new features and functions and improve existing applications.

• Participating in code reviews and pair programming to ensure the quality and security of our code base.

• Analyzing and fixing bugs and issues in our applications.

Qualifications

You want to develop software and work on web front ends that are used by thousands of customers worldwide every day, and you are eager to continuously improve them for our customers.

• You have extensive experience in software development with JavaScript, Java, and Spring.

• Ideally, you have already worked with a modern framework such as React or Angular and have experience with build tools such as npm, Webpack, or grunt, as well as Maven in the Java backend.

• You have experience in unit testing and ideally also with Selenium tests, and are confident in using git for version control.

• You also have a good technical understanding of common web technologies such as HTML, XML, (S)CSS, and JavaScript.

• You are open and communicative and want to work in an interdisciplinary team of UX designers, developers, and test engineers in an agile environment.

• Ownership is not a foreign concept to you.

• You can communicate easily in English and German.

Benefits

• Hybrid working model.

• Flexible working hours through trust-based working hours.

• At some locations a subsidized canteen and various free drinks.

• Modern office space with very good transport connections.

• Various employee discounts for activities and products.

• Employee events such as summer and winter parties, as well as workshops.

• Numerous training and development opportunities.

• Various health offers, such as sports and health courses.

About IONOS

IONOS is the leading European digitalization partner for small and medium-sized businesses (SMB). The company serves around six million customers and operates across 18 markets in Europe and North America, with its services being accessible worldwide. With its Web Presence & Productivity portfolio, IONOS acts as a 'one-stop shop' for all digitalization needs: from domains and web hosting to classic website builders and do-it-yourself solutions, from e-commerce to online marketing tools. In addition, the company offers Cloud Solutions to enterprises who are looking to move to the cloud as their businesses evolve.

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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