ORDIX AG · Paderborn, Germany

• Instructor for Ansible and Puppet automation courses: 14 seminars delivered over the past three years, to groups of between 3 and 24 participants, with audiences from senior Linux engineers to stakeholders with no automation background.
• Sole responsibility for the cooperative degree programme at the local office (German duales Studium, combining paid employment with university study) since 2024: four computer science students to date, with a fifth starting in October. Covers hiring decisions, assignment planning, technical instruction and career development.
• Combined tenure at a German federal financial institution across the engagements below is 36 months as of Feb 2027. German labour law (AÜG) caps continuous external placement at one client at 18 months and requires a break before re-engagement; the gap reflects that.

ORDIX AG — client: a German federal financial institution

• Site reliability and day-to-day operations for a four-figure RHEL estate under central-bank audit and change-control requirements.
• Contributing to the RHEL 8 to RHEL 9 migration programme, with in-place upgrades via Leapp for a minority of the estate and reinstallation for the remainder.
• Replaced the manual rollout of sudoers configuration across the estate with an Ansible-based process; currently extending the same approach to SSH access and Active Directory group management.
• RPM packaging and distribution of internal software and automation content through Red Hat Satellite.
• Malware protection tooling and 24/7 on-call rotation.

ORDIX AG — client: a financial services provider in the banking sector

• PostgreSQL database operations and last-level support for business intelligence systems.
• Owned deployment and release processes; performed technical code review for automation content.
• Automation of permission management and recurring operational tasks.

ORDIX AG — client: a German federal financial institution

• Part of the team that migrated a four-figure RHEL 7 estate to RHEL 8, roughly half of it by in-place upgrade using Leapp and the remainder by reinstallation.
• Acted as technical advisor to internal business units throughout the programme: assessed whether in-place upgrade or reinstallation fit each application, walked service owners through safe shutdown procedures and backup/rollback strategy, and identified which RHEL 8 breaking changes affected their specific workloads.
• Planned and executed upgrades within agreed maintenance windows, coordinating directly with the affected departments.
• Ansible-based automation for RHEL provisioning and configuration management.
• Software packaging and lifecycle management via Red Hat Satellite and fpm; author or maintainer of roughly half the team's internal package catalogue.

dogado GmbH · Dortmund, Germany

• Operated the Kubernetes cluster behind a high-traffic international tourism platform, including rolling node patching without service interruption.
• Managed cloud infrastructure for B2B customers on Puppet and Proxmox, with 24/7 on-call responsibility.

Babiel GmbH · Düsseldorf, Germany

• Operated websites and web applications for German federal and state government bodies and several large industrial groups, with 24/7 on-call responsibility.
• Rebuilt a high-traffic public information portal from a single web server and database host onto a load-balanced web server cluster backed by a Patroni-managed PostgreSQL cluster. The largest project of this role.
• Automated operating system and application patching across the estate with Puppet.
• Contributed to building Hadoop-based big data tooling on Kubernetes.

medienPARK GmbH & Co. KG · Germany

• Introduced Ansible to the organisation and built the automation platform from the ground up: control node, standardised web server provisioning, and templated deployment for around a dozen smaller customer sites.
• Built the GitLab CI/CD pipeline for a large German online retailer and contributed a substantial share of the Ansible provisioning behind it, alongside CDN integration, HAProxy failover and a MariaDB Galera cluster.
• Introduced FreeIPA (upstream of Red Hat Identity Management) to centralise SSH access control for administrators and developers, replacing per-host key distribution.
• Hands-on datacenter operations and direct technical customer support.

medienPARK GmbH & Co. KG

• German dual vocational programme (Fachinformatiker für Systemintegration): two years of paid employment combined with state vocational schooling, concluding in national certification by the German Chamber of Commerce (IHK).