Our mission:

Are you a motivated experienced person, used to working in an international multi-cultural environment, who really wants to make a difference in the open-source world?At Open-Xchange, we decided to leave dead-end jobs where you don't make an impact and offer passionate experts the opportunity to be part of an agile, international team that connects the world and millions of people by developing and delivering open-source technologies.  We believe it’s crucial to work in an environment where people feel valued, are energized by their work and deliver added value.

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. 
• Stay up to date with latest tech, by working on modern private cloud software in a dynamic, international team.
• Sharing ideas and collaborating with each other to drive the company’s success is part of our DNA.
• 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! All you need to do is get in touch, so click the ‘apply now’ button, fill the form and be in contact.

Discover what Open-Xchange offers you:

• Our non-hierarchical organization not only ensures much better value creation for our customers, it also provides the best possible work environment for every one of us.
• We believe that everyone at OX will always do what is best for the company. We believe that the full potential for high performance is only realized within an organizational structure that enables each individual to work with clear focus and to take full responsibility for their tasks.
• At OX we focus a lot on mastery. It influences our decision-making processes and is a great part of how we look at professional development.
• We believe in openness and diversity, which are crucial to OX’s success. Different opinions, ways of thinking, and cultures enrich us and help us to better understand the bigger picture.
• At OX you'll be working with the whole tech stack, using open source technology, and delivering excellent products to our customers.

Your contact person:

Reach out to Justin ([email protected]) from the People Team. He will be able to discuss current opportunities and tell you more about our exciting vision and mission @OX.

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 Middleware 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 teams 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 teams 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