Freelancer profile translated to English.
Back to original languageAbout Jonah
I am a DevOps Engineer from Hamburg and have been a passionate IT professional all my life. I started my career as a software developer and, over the years, with my increasing interest in infrastructure (servers, network, SaaS, IaC) and automation, I found myself in the DevOps field, which for me is a perfect mix of my IT preferences.
German
Native or bilingual
Can work on-site
Hamburg (up to 50km)
Experience
- Große Drogeriemarkt-Kette in DeutschlandGitlab AdministratorRETAIL (SMALL BUSINESS)May 2024 - Today (2 years and 1 month)Migration of an existing GitLab Omnibus installation with around 1,000 active users to a cloud-native hybrid installation in Google Cloud.The new environment was built in Google Cloud using the GitLab Environment Toolkit (Ansible and Terraform).Datadog was used for monitoring. The GitLab Environment Toolkit was adapted to install Datadog as a component on Gitaly, Praefect, and Kubernetes to capture metrics and logs, ensuring complete monitoring of the environment.This approach provided a scalable GitLab environment that meets the performance and transparency requirements for a large number of users.
- PAYONE GmbHSenior DevOps EngineerBANKING AND INSURANCEOctober 2022 - January 2024 (1 year and 3 months)Hamburg, GermanyIn this project, 10 microservices, which communicate directly via HTTP, were transformed into a stream processing architecture with 30 almost independent microservices that exchange data via Kafka. This served to stabilize a critical system for processing payment transactions (with PCI-DSS relevance) for a German financial service provider.My responsibilities in this project included:
- Implementing a development workflow with Git and CI/CD pipeline
- Implementing security requirements (especially PCI DSS requirements).
- Visualizing logs and metrics with Grafana and setting up monitoring.
- On-call duty around the clock (24/7).
- Setting up and configuring Kubernetes clusters on-premise with Kubespray and ensuring production operation.
- Deploying GitLab in a Kubernetes cluster to automate DevOps tasks (executing Ansible Playbooks and Shell scripts) in DEV and TEST environments
- SERGO GmbHSystem Administrator and Software EngineerDIGITAL AND ITSeptember 2022 - October 2023 (1 year and 2 months)Hamburg, GermanyAs part of an internal project, we redeveloped a customer portal to provide business customers with automated billing services for server services, among others. This project also serves as a showcase to demonstrate the work of myself and my partner.Current status: only on demand - ongoing support (updates, maintenance) of the various development systems (Gitlab, Nexus Repo, Octopus, K8S Cluster).My responsibilities in this project included:
- Building Kubernetes clusters with Kubespray for various stages (Dev, Test, Production)
- Implementing monitoring and backup solutions
- Deploying and maintaining development tools such as GitLab, Nexus, SonarQube, and Octopus Deployment
- Setting up a fully automated GitLab pipeline for creating NuGet packages, Docker containers, and Helm charts - including automated versioning according to SemVer schema and deployment with Octopus Deploy
- Deploying Keycloak as an authentication server for customer logins
- Building GitLab Runner infrastructure
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Certifications
- Certified Kubernetes Application Developer (CKAD)Cloud Native Computing Foundation2023