Open-Xchange Tech Stack

Open Source mail, messaging, and DNS infrastructure for hosters and telecoms

Software Development Köln, Nordrhein-Westfalen 201–500 employees Founded 2005 Privately Held

Open-Xchange operates three production-grade infrastructure products (Dovecot IMAP, PowerDNS, and a collaboration suite) serving 220+ million seats through major hosting and telecom partners. The stack is Java/Spring Boot + Kubernetes + GitLab CI/CD, with active migration and deployment projects pointing to infrastructure modernization work — likely driven by the cited gap between product and infrastructure capabilities and the need to unify multiple billing systems across the customer base.

Tech Stack 12 technologies

Core StackJava Docker Kubernetes Helm GitLab CI/CD Jenkins MySQL Redis Linux Spring Boot OSGi Gradle

What Open-Xchange Is Building

◆Challenges

Migration projects in public sector
Gap between product and infrastructure
Digital infrastructure transition
Platform deployment reliability
Multiple parallel billing systems
Data quality across contract lifecycle

▲Active Projects

Verschlüsselungs-framework der ox app suite
E-mail-verschlüsselungsfunktionen
Backend- und middleware-komponenten
Migration projects
Update and change projects
Kubernetes-based linux environment deployment
Vm-based deployment solutions

Hiring Activity

Accelerating5 roles · 3 in 30d

Department

Engineering

Finance

Seniority

Mid

Senior

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About Open-Xchange

Open-Xchange develops Open Source communication and productivity software, primarily distributed through hosting providers and telecommunications carriers. The company maintains three core offerings: Dovecot (IMAP server), PowerDNS (DNS services), and a messaging/collaboration suite. With 230+ employees split across offices in Germany (Cologne, Hamburg, Nuremberg, Olpe), the USA (Palo Alto, New York), Finland, and The Netherlands, OX operates a B2B2C model where end-user adoption flows through partner infrastructure rather than direct sales. The product roadmap emphasizes encryption, backend components, and deployment modernization.

HeadquartersKöln, Nordrhein-Westfalen

Company Size201–500 employees

Founded2005

Hiring MarketsGermany

Frequently Asked Questions

What is Open-Xchange's main product?

Open-Xchange develops mail, messaging, and DNS infrastructure software. Dovecot is the world's most widely used IMAP server; PowerDNS provides DNS services; and the OX App Suite handles messaging and productivity, deployed across 220+ million seats globally.

What tech stack does Open-Xchange use?

Java, Spring Boot, OSGi, Docker, Kubernetes, Helm, GitLab CI/CD, Jenkins, Gradle, MySQL, Redis, and Linux form the primary stack, with active Kubernetes-based deployment and migration initiatives.