Hi, my name is

Roman.

I'm a Senior DevOps Engineer.

Senior DevOps Engineer specializing in Linux, automation, observability, and CI/CD. Over 20 years of experience designing, operating, and improving reliable infrastructure.

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About Me

Roman Pertl profile picture
Senior DevOps Engineer with more than 20 years of experience in Linux administration, infrastructure automation, monitoring, and CI/CD. Currently working at A1 Telekom Austria AG in Vienna, where I design and operate secure, reliable infrastructure. Core technologies and platforms:
Operating Systems & Virtualization
  • Debian Linux
  • Proxmox
Automation & Infrastructure as Code
  • Ansible
  • Puppet
  • Terraform
Containers & Cloud
  • Docker
  • Kubernetes
  • AWS
  • Google Cloud Platform
CI/CD & Observability
  • GitLab CI/CD
  • GitHub Actions
  • Argo CD
  • Prometheus
  • Grafana
  • CheckMK
Databases & Identity
  • PostgreSQL
  • MySQL
  • Redis
  • OpenSearch
  • Keycloak
Networking & Security
  • Cisco ASA
  • Routing and VPNs
  • SOX Compliance
  • PCI DSS

Experience

Senior Linux and DevOps Engineer - A1 Telekom Austria AG
Oct 2021 - present
  • Delivered end-to-end infrastructure administration for the billing platform, covering networking with Cisco ASA firewalls, NetApp storage, Proxmox virtualization, Python applications, PostgreSQL and Redis databases, and GitLab CI/CD in a SOX-compliant environment.
  • Led the introduction and rollout of Keycloak as the central identity & access management (SSO/IAM) platform, covering user provisioning, authentication, credential lifecycle management and integration of multiple external company directories.
  • Drove infrastructure-as-code and configuration management adoption using Puppet and Ansible, automating server configuration, patching, and repeatable operational tasks across the fleet.
  • Ensured continuous SOX compliance across infrastructure changes, backups, and access management, supporting audit and regulatory requirements.
  • Led Debian OS upgrade cycles across the server fleet as part of ongoing security patching and compliance efforts.
  • Redesigned the monitoring system using Prometheus metrics and Grafana dashboards for improved observability and alerting.
Senior DevOps Engineer - ready2order GmbH

I worked as a Senior DevOps Engineer.

  • Implemented and operated highly available web services in the cloud (AWS, GCP).
  • Administered and performance-tuned SQL databases (MySQL, PostgreSQL).
  • Provided 3rd-level troubleshooting for highly complex web applications.
  • Managed configuration with Terraform and Ansible
  • Automated processes and wrote tooling in Bash and PHP.
  • Implemented and improved CI/CD pipelines in GitLab, including migration from Jenkins.
  • Migrated a legacy deployment to a container-based deployment.
  • Consolidated multiple projects into a single monorepo.
Senior System Administrator - Ixolit GmbH

I was a member of the IT operations department, focusing on Linux.

  • Developed and maintained highly scalable web projects (network design, monitoring, high availability, and load balancing).
  • Administered highly available databases (Percona MySQL, PostgreSQL, Elasticsearch).
  • Planned and performed service migrations with minimal downtime.
  • Automated processes using Bash, PHP, and Python scripts.
  • Managed configuration with Puppet and Ansible.
  • Administered networks (Ethernet, routing, VPNs).
  • Diagnosed and resolved highly complex technical problems.
  • Implemented a PCI-DSS compliant infrastructure (Level 1 Service Provider).
  • Participated in the on-call duty rotation.
  • Served as assistant head of operations.
System Administrator - Xion AG

I was a member of the IT operations department, focusing on Linux.

  • Maintained virtual servers across three datacenters in different countries
  • Performed an upgrade of the distributed Check Point firewall
  • Participated in a project to replace the legacy infrastructure with a VMware setup
  • Participated in the on-call duty rotation.
CTO and Co-founder - ISSP

Co-founder and CTO of an ISP providing the following services to over 500 customers, including many business customers:

  • Domains
  • Email
  • Web hosting
  • Virtual servers

During this time, I developed a customer panel and built a highly available infrastructure. The following software was used:

  • Xen
  • Linux
  • Apache
  • PHP
  • Postfix
  • Dovecot
  • ProFTPd
  • MySQL

Education

2006 - 2008
Master of Science in Secure Information Systems
University of Applied Science Hagenberg

Key aspect:

  • Advanced networking
  • Forensics Master thesis: “Trusted Computing with Solaris”
2003 - 2006
Bachelor of Science in Secure Information Systems
University of Applied Science Hagenberg, Austria
During my studies, I wrote a paper on server virtualization covering different technologies (Microsoft Virtual Server, VMware, Xen)