Stefan Büringer
Principal Engineer at VMware
Ulm, Baden-Württemberg, Germany
Summary
🤩
Rockstar🎓
Top SchoolStefan Büringer is a Principal Engineer at VMware with 11 years of experience building cloud-native infrastructure and automation, specializing in Kubernetes Cluster API and controller-runtime maintenance. He pairs deep backend and DevOps expertise with hands-on contributions to high-profile Kubernetes projects—helping shape Cluster API providers for OpenStack and AWS, controller-runtime improvements, and core test-infra tooling. Stefan’s work spans CI/CD, CRD/webhook plumbing, and multi-node control plane automation, reflecting a strong mastery of Kubernetes control-plane mechanics and infrastructure-as-code. Based in Ulm, Germany, he combines enterprise-grade engineering at VMware with active upstream stewardship in kubernetes-sigs, often addressing subtle correctness issues (e.g., config verification and etcd/control-plane handling) that prevent production outages.
11 years of coding experience
10 years of employment as a software developer
Master of Science (M.Sc.), Informatik, Master of Science (M.Sc.), Informatik at Universität Ulm
Stackoverflow
31reputation
0reached
1answer
0questions
Github Skills (39)
kubernetes10
docker10
k3s10
apidoc10
testing10
cloud-infrastructure10
dockers10
cicd10
gcp10
automation10
go10
openstack10
api10
aws10
inf10
Programming languages (18)
Github contributions (5)
kubernetes-sigs/cluster-api
Oct 2019 - Jan 2023
Home for Cluster API, a subproject of sig-cluster-lifecycle
Role in this project:
Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:7075 reviews, 567 commits, 916 PRs in 3 years 3 months
Contributions summary:Stefan's commits primarily focused on enhancements and bug fixes within the Kubernetes-sigs/cluster-api project, specifically concerning the Cluster API management. Their contributions included the migration of webhooks, adjustments to KCP and MD rollout strategies, and improvements in error handling for resource management. They also demonstrated proficiency in CI/CD setup and debugging, alongside a strong understanding of the Kubernetes API, evident in their corrections related to control plane management and etcd member operations.
apilifecyclesubprojectcluster-apisig
kubernetes-sigs/cluster-api-provider-openstack
Jun 2019 - Nov 2021
Cluster API implementation for OpenStack
Role in this project:Backend & DevOps Engineer
Backend & DevOps EngineerContributions:7 releases, 276 reviews, 105 commits in 2 years 6 months
Contributions summary:Stefan contributed significantly to the core functionality of the `kubernetes-sigs/cluster-api-provider-openstack` repository. They addressed crucial aspects of the OpenStack integration, including correcting the usage of verification properties from `clouds.yaml` and refactoring services for improved structure, especially focusing on the upcoming multi-node control plane support. Further, they implemented features such as external router IP configuration and managed API server load balancers. Their work demonstrated a strong understanding of backend systems, infrastructure, and automation for Kubernetes clusters.
k8s-sig-cluster-lifecycle
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