Stefan Schimanski
AI Inference, Principal Engineer at O'Reilly
Frankfurt Rhine-Main Metropolitan Area Germany
Summary
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Rockstar🎓
Top School
Top expert inKubernetes and Cloud-Native Technologies
Stefan Schimanski is a Principal Engineer with a Ph.D. in Mathematical Logic and over 15 years of hands-on experience building large-scale Linux and cloud-native systems, currently at NVIDIA after leading product engineering at Upbound. He blends deep theoretical training with practical expertise in Kubernetes, API servers, and code-generation tooling—evidenced by substantial contributions to core projects like kubernetes/code-generator, client-go and kube-openapi. Stefan has led engineering teams and managed mission-critical 24/7 Linux platforms, driving DevOps, CI, and automated testing practices at scale while mentoring engineers. His work spans both backend and infrastructure, from implementing kubeconfig APIs and CRD schema generators to improving operator bootstrapping and metrics handling. Known for questioning processes and pushing product visions, he repeatedly modernizes legacy systems and build tooling to improve developer velocity. Outside the obvious, he started as a contributor to desktop and scientific tooling (LyX, KDE) and still combines product-minded engineering with formal-methods rigor.
14 years of coding experience
22 years of employment as a software developer
Ludwig Maximilian University of MunichDiploma Mathematics, Diploma Mathematics at Technische Universität Clausthal
German, English, Italian, French
Stackoverflow
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Github Skills (88)
dependency-management10
controller10
package-management10
api-client10
testing10
health-check10
command-line-interface10
authentication10
bash10
file-operations10
zookeeper10
refactor10
automation10
infrastructure10
code-generation10
Programming languages (29)
Github contributions (5)
kubernetes/kube-openapi
Nov 2017 - Nov 2020
Kubernetes OpenAPI spec generation & serving
Role in this project:
Back-end Developer
Back-end DeveloperContributions:73 reviews, 51 commits, 25 PRs in 3 years
Contributions summary:Stefan made significant contributions to the `kubernetes/kube-openapi` repository, focusing on the OpenAPI specification generation and serving functionality. Their work included fixing generator issues related to pre-existing Go files and splitting out the aggregator walker. They implemented testing and benchmarking related to the merging of specs. Further, the user improved the efficiency of the handler by using jsoniter for faster marshalling.
kubernetesopenapi
openshift/cluster-kube-apiserver-operator
Aug 2018 - Oct 2021
The kube-apiserver operator installs and maintains the kube-apiserver on a cluster
Role in this project:Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:165 reviews, 242 commits, 205 PRs in 3 years 2 months
Contributions summary:Stefan's contributions focused on integrating and maintaining the `k8s.io/code-generator` dependency, which likely supports code generation for API clients and related resources. Their work included vendorizing the library and adding generated files to the project. Additionally, they added audit settings and modified the pod configuration, demonstrating involvement in operational aspects such as logging, termination behavior, and system-level resource settings.
kube-apiserveroperator
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