[Hiring] Senior Professional Services Engineer @Open-Xchange

Role Description

Are you an engineer with real technical depth AND do you want to own the relationship with one of our major hosting customers? This combination is rare.

Your new job includes:

• Be present in the customer relationship - regular calls, occasional on-site visits, and persistent continuity that the customer's technical teams know you by name and trust your word.
• Build reference labs and generate reference configurations from them.
• Participate in OX-internal development of those frameworks.
• Analyze and resolve technical issues across the OX App Suite 8 stack.
• Translate customer feature requests and operational requirements into clear input for internal product and development teams.
• Support the customer through upgrades, configuration changes, and new feature rollouts.
• Document solutions, workarounds, and deployment specifics - both for the customer and internally.
• A typical day mixes customer and internal calls, hands-on lab and reference-configuration work, and technical documentation.
• Limited travel is required for customer-facing meetings (~1-2 per quarter) and company-internal meetings (~1 per quarter).

Qualifications

• Proven ability to hold your ground in a technical disagreement with a customer or partner.
• Solid hands-on experience with Linux-based server environments.
• Working knowledge of several core stack components:
• Mail infrastructure (IMAP/SMTP, Dovecot or equivalent).
• Relational databases (MariaDB/MySQL).
• Containerized deployments on Kubernetes.
• Familiarity with monitoring and alerting (Prometheus/Grafana or equivalent).
• Practical experience troubleshooting distributed systems in production.
• Comfortable writing scripts to automate operational tasks or reproduce issues.
• Experience in a customer-facing technical role.
• Familiarity with Helm-based deployments and operational patterns.
• Able to work across teams and communicate technical details to people with different backgrounds.
• Clear written communication is a requirement.
• Good written and spoken English is required; fluency in German is necessary for this customer relationship.

Requirements

• Scale 1-5 where 5 means “hands-on depth expected on day one” and 1 means “we expect nothing and train it on the job”:
• OX App Suite 8 | 1
• Kubernetes (Helm-based deployments) | 5
• Mail infrastructure: Dovecot (CE / Pro), Postfix, IMAP/SMTP) | 2
• Data layer: MariaDB, Redis | 3
• Storage: Object storage (S3-compatible), Rook Ceph | 2
• Identity: Keycloak, LDAP | 2
• Observability: Prometheus, Grafana (or comparable stack) | 3
• Tooling: Linux, Bash/Python, kubectl, Helm | 5
• Networking: Istio (operational awareness, not configuration ownership) | 2

Benefits

• The flexibility to work 100% remotely.
• 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.
• Financial relief through corporate benefits and a subsidy for ergonomic chairs and desks.
• Further location-related benefits can be discussed in an initial talk.

Company Description

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.

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.

Openness and diversity are core to OX. Different perspectives, backgrounds, and ways of thinking strengthen our collaboration and help us see the bigger picture.