Our mission:

Are you a motivated Software Developer looking to make an impact by strengthening digital sovereignty in the public sector in Germany?

At Open-Xchange, we develop and deliver open-source communication and collaboration technologies for email and DNS security that connect millions of people worldwide.

Discover what Open-Xchange offers you:

• We work in a non-hierarchical organization that empowers everyone to take responsibility, stay focused, and contribute directly to the company’s success and customer value.
• We value expertise and continuous professional development. Our professionals work closely with experienced colleagues, take ownership of their work, and continuously expand their skills
• Openness and diversity are core to OX. Different perspectives, backgrounds, and ways of thinking strengthen our collaboration and help us see the bigger picture.

Your team:

As part of the cross-functional OX Public Sector team, you will help develop secure email solutions that strengthen digital sovereignty in Germany. As a Java Developer, you will enhance the encryption framework of OX App Suite, including PGP, S/MIME, and end-to-end encryption (E2EE). You will work closely with product, security, and UI colleagues to deliver a robust and user-friendly encryption experience.

Your new job:

• Maintain and improve existing backend and middleware components. 
• Design and develop new services and APIs. 
• Contribute to email encryption features (PGP, S/MIME, and end-to-end encryption). 
• Collaborate with security and product colleagues to deliver reliable, user-friendly solutions. 
• Support CI/CD pipelines, containerized deployments, and system operations. 
• Write tests, review code, and document your work. 

This is the tech stack you'll be working with:

• Programming languages and frameworks: Java, Spring Boot, OSGi
• Containerization and orchestration: Docker, Kubernetes, Helm
• CI/CD: GitLab CI, Jenkins
• Build tools: Gradle
• Databases: MariaDB/MySQL, Redis

Your background:

• Solid hands-on experience in software development, preferably in Java-based systems. 
• Strong motivation and passion for working with the mentioned tech stack.
• Interest or experience in secure communication technologies and cryptographic concepts (e.g. PGP, S/MIME, key handling, certificate chains, message signing). 
• Experience with RESTful APIs, microservices, and distributed systems. 
• Familiarity with end-to-end encryption concepts or architectures is a strong plus. 
• Knowledge of email standards (SMTP, IMAP, MIME) is beneficial. 
• Strong verbal and written communication skills in both German and English. 
• Intrinsic motivation to take ownership and a passion for open-source technologies, thriving in a low-hierarchy environment.
• Comfortable working in a remote-first environment with multicultural teams across different time zones.

This is what you get at Open-Xchange:

• The flexibility to work 100% remotely ensures a work environment that suits you best.
• Flexible working hours that allow you to successfully combine your home and family responsibilities with work. 
• Getting together in-person for workshops and fun team events. 
• Time off to volunteer – and mental health support when you need it.
• We provide financial relief through corporate benefits and a subsidy for ergonomic chairs and desks.
• We can discuss further location-related benefits together in an initial talk.

Join the team:

Join us in our fight for an open internet and deliver added value! Click “Apply now” to submit your application.

Your contact person:

Reach out to Justin (recruiting@open-xchange.com) from the People Team. He will be able to discuss current opportunities and tell you more about our exciting vision and mission @OX.