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$ cat ~/experience/career.log

15+ Years of Professional Experience

Schäfer Shop DigitalCurrent

Freelance Senior DevOps Engineer

  • →Co-developed a private Kubernetes platform in a 9-person DevOps team, enabling the business-critical E-Commerce Shop(s) and its associated Java-based services.
  • →Supported the migration to a self-hosted Kubernetes environment on Hetzner, covering cluster rollout, multi-environment provisioning, and day-2 operations at scale.
  • →Spearheaded efforts that reduced p95 latency for the shop from ~1500ms to 278ms
  • →Directed the migration from an On-Premise Galera Cluster to in-cluster Percona XtraDB Clusters with the development of a comprehensive lifecycle framework and backup structure.
  • →Held primary responsibility for all NGINX and Ingress-related operations.
  • →Held primary responsibility for all Database (SQL & NoSQL) clusters, performance tuning, and high-availability setups.
KubernetesHetznerNGINXPercona XtraDB ClusterMongoDBPythonPerformance Tuning
VW Group / Audi Kubika-O

Freelance Platform Engineer

  • →Co-Development and Operation of the internal and managed OpenShift platform in the Container Competence Center + Platforms (CCCP) Team at Audi.
  • →Implementation of a fully managed WAF based on NGINX Plus Ingress Controller / AppProtect for tenants as an opt-in VW Group service, as main developer.
  • →Introduction of NGINX Plus (IC) as a central load-balancer for Audi's OpenShift tenants, as main developer.
  • →Co-implementation of several K8s security frameworks.
OpenShiftNGINX PlusF5 AppProtectAqua Security
sofort-impfen.de

Lead DevOps Engineer

  • →Responsible for operation, automation, protection, continuous monitoring and scaling of high-available infrastructure designed for a platform written in Go.
  • →Provided more than 1.2 million people (with 3 million registrations) in Germany with a COVID-19 vaccination in their close vicinity.
  • →Managed high-traffic project with HA Sentinel Redis peaking over 2.5Gbit/s and egress HTTPS 850Mbit/s.
HetznerGoPythonRedisHigh AvailabilityPerformance TuningAnsible
Cornelsen Verlags GmbH

Freelance DevOps Engineer

  • →Migration of several IDM/IDP installations from self-hosted infrastructure to AWS, while ensuring cost effectiveness.
  • →Development of AWS CloudFormation Templates.
  • →Maintenance and Development of Jenkins CI/CD pipelines to ensure the full lifecycle of in-house developed services across multiple AWS environments & regions.
AWSCloudFormationJenkinsIDM/IDP
Tom Tailor GmbH

Freelance DevOps Engineer

  • →Supported the migration from a hybrid & managed hosting stack to the AboutYou private cloud.
  • →Development & Maintenance of XL Release & Jenkins CI/CD pipelines.
  • →Maintenance of the existing B2C infrastructure until the migration was finished.
XL ReleaseJenkinsPrivate Cloud Migration
Profiflitzer GmbH

Freelance DevOps Consultant

  • →Implementation of configuration management in Ansible.
  • →Took over the development of GitLab CI/CD pipelines.
  • →Continuous maintenance of the existing infrastructure on Azure.
  • →Providing DevOps consultancy and training on best-practices for the in-house PHP developers.
AzureAnsibleGitLab CI/CDPHP
Berlin Brands Group / Chal-Tec GmbH

Freelance DevOps Architect

  • →Rebuilt the architecture of the infrastructure on AWS and CI/CD pipelines for more than 20 B2C shops and supported the first go-live.
  • →Provided consultancy and execute continuous training on best-practices of the in-house DevOps engineers.
HetznerCI/CDDevOps Training
Shinpuro UG

Freelance Backend Developer & DevOps Engineer

  • →New development of an Instagram-like platform geared towards the fashion sector, called Fashionist.
  • →Developed the backend with heavy use of Node.js & MongoDB.
  • →Optimized the HA infrastructure with a permanent focus on the performance (TTFB) of the responses.
Node.jsMongoDBPerformance OptimizationHigh Availability
ScaleCommerce GmbH

Application & DevOps Engineer GNU/Linux

  • →Operated and maintained a large-scale Docker container platform across multiple customer environments and projects, with configuration management automated via Puppet.
  • →Working closely with customers for the full project lifecycle, from the technical onboarding until the go-live and the ongoing maintenance
  • →Performance optimization & horizontal scaling of E-Commerce applications (e.g. Shopware, Magento, Spryker), where every millisecond time-to-first-byte counts.
DockerPuppetE-CommercePerformance OptimizationShopwareMagento
Native Instruments GmbH

DevOps Engineer GNU/Linux

  • →Operated and stabilized the resulting container platform with standardized automation and configuration management.
  • →Developed internal tools to improve the developer experience and streamline the deployment process of microservices-based applications.
DockerPuppet
SysEleven GmbH

DevOps Engineer GNU/Linux & Mentor

  • →Designed, operated, and automated large-scale Virtuozzo-based container platforms across multi-tenant customer environments, using Puppet for configuration management and standardizing day-2 operations.
  • →Co-development of the automation for upgrading the global infrastructure, including a significant reduction in the time required to roll out new mainline kernels.
  • →Mentored and trained new colleagues in the company, provided technical insight and blog articles.
VirtuozzoPuppetInfrastructure AutomationMentoring
Wavecon GmbH

DevOps & Junior System Engineer GNU/Linux

  • →Operation of XEN containers and the hosting platform, in their respective customer projects.
XENPythonInfrastructure Development