Experienced Freelance DevOps Engineer, Site Reliability Engineer, Cloud and On-premise Specialist

10/2021 – 6/2023

- Developed and managed a GitOps Kubernetes platform, using Argo CD, VMWare Tanzu, and VMWare Carvel (imgpkg, ytt, vendir, kbld). Serving large industrial customers.

- Developed several Kubernetes Operators in Go. Operators were used for infrastructure and in-cluster provisioning, enhancing developer and customer experience by optimizing infrastructure provisioning.

- Developed, tested and maintained Helm charts for dozens of different technologies, including: Kafka, cert-manager, ArgoCD, Postgres-Operator, Prometheus, Redis-Operator, MariaDB-Operator, Thanos, and many more.

- Developed and maintained observability systems using Prometheus, ELK, Grafana, Loki, and the OpenTelemetry framework.

- Developed, managed and improved ArgoCD and GitLab CI pipelines.

- Refactored core Kubernetes architecture to enable a modern platform approach to deploying apps and components.

DevOps, Continuous Integration, Linux Entwicklung, Python, Cloud Computing, Golang, Paas

12/2018 – 7/2022

- Designed and developed a large Kubernetes infrastructure, encompassing dozens of Kubernetes clusters running across different regions and environments, both in AWS and Azure. The total amount of nodes fluctuated between 500-1000 Kubernetes nodes (auto-scaled).

- Provided SRE services to the whole infrastructure. Including defining SLIs, SLOs, and performing on-duty calls.

- Supported various development teams, and scaled the platform to 200+ car technology applications, communicating with more than 3 million vehicles, receiving thousands of requests per second.

- Led and took ownership of every single component of the architecture, debugging, testing, mitigating issues, and preventing potential problems.

- Designed and developed AWS and Azure cloud infrastructure, using Terraform, AWS CDK, AWS Codebuild, and more.

- Built, maintained and deployed dozens of Helm charts, for all kinds of core Kubernetes components.

- Ensured compliance and high security standards using various tools, including kube-bench, KubeSec, Aqua Security and SonarQube.

- Developed and implemented CI/CD pipelines, running in Concourse CI, and created GitOps workflows using Flux.

- Designed and implemented an observability stack, using Prometheus, Grafana, ELK and more.

- Designed, developed and tested system tools written in Go.

Continuous Delivery, Linux Entwicklung, Python, Cloud Computing, Microsoft Azure, Amazon Web Services (AWS), Golang, Kubernetes, DevOps

4/2016 – 7/2018

- Became a key person in the small infrastructure team and directly contributed to the business growth, as the company onboarded thousands of clients at a fast pace. Increasing the infrastructure demand. The business efficiency and growth resulted in a successful acquisition by SAP for 1 billion euros.

- Introduced, developed and operated all Kubernetes clusters of the company, running on top of AWS and Azure across several regions of the globe, including North America, Europe and Asia. 500+ Kubernetes nodes, deployed using Kops, Terraform and self-managed solutions.

- Maintained and performed SRE work on all aspects of the infrastructure, including cloud infrastructure and on-premise datacenter, Databases, Networking, message systems and so on. Including defining SLIs, SLOs, and performing on-duty calls.

Continuous Delivery, DevOps, Continuous Integration, Python, Microsoft Azure, Amazon Web Services (AWS), Golang, Kubernetes