Fullstack JavaScript Developer (m/f/d)

Our mission: Are you a motivated fullstack developer who wants to make an impact by building and operating modern web applications, owning features from idea to production, and helping shape the future of OX App Suite? At Open-Xchange (OX), we develop open-source communication and collaboration software used by public sector organizations, telcos, and hosting providers to keep data secure and under their control. Our products cover email, collaboration, DNS security, and related services, and are used by millions of people worldwide. Discover what OX 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: You'll join BizDev (Business Development), the team building new products and features on top of OX App Suite. We focus on making onboarding, configuration and maintenance easier for our customers while turning common customizations into reusable, configurable product features. Our flagship product is COP, our onboarding and brand-configuration platform, and we also work directly on the core App Suite. We own our work end-to-end, from the first idea through to production. Your new job: Build and maintain Vue 3 single-page applications for COP and the core OX App Suite. Turn customer- and brand-specific customizations into reusable, configurable and brandable components. Develop the Node.js services behind them, including clean REST APIs and identity integrations. Write and maintain unit and end-to-end tests, and troubleshoot infrastructure issues before blaming the application code. Deliver features across the full lifecycle using GitLab CI/CD, containers and Kubernetes. Work in an issue-driven development process with small merge requests, regular code reviews and lightweight agile practices. This is the tech stack you'll be working with: Languages & frameworks: JavaScript, Vue 3, Node.js Frontend: Pinia, Vue Router, Vite Testing: Vitest, CodeceptJS Containers & CI/CD: Docker, Kubernetes, Harbor, GitLab CI/CD Authentication & tooling: Keycloak, pnpm, Claude Code Your background: Several years of professional experience in fullstack web development. A Master's degree in Computer Science, Software Engineering, or a related field. Strong proficiency in Vue 3 and JavaScript, with a passion for building reusable, configurable and accessible user interfaces. Experience developing Node.js backend services with clean REST APIs and identity integrations. A pragmatic approach to testing, troubleshooting and debugging across the entire stack. Good judgment when using AI coding assistants such as Claude Code, combined with the ability to take ownership of tasks from idea to production and a preference for simple solutions over unnecessary complexity. Strong verbal and written communication skills in English and German. Intrinsic motivation, a collaborative mindset, and a passion for Open Source technologies 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 OX: 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 ([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. Apply To This Job