Casey Callendrello

Berlin, Germany

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Summary

🤩

Rockstar

Casey Callendrello is a Principal Software Engineer based in Berlin with 15 years building cloud-native networking and infrastructure, currently at Isovalent and a maintainer of the CNI project. He brings deep expertise from CoreOS and Red Hat, with sustained open-source work across CNI, OVN-Kubernetes, OpenShift installer and cluster-network-operator. Casey focuses on operability and reliability—improving CI/CD, migrating projects to go modules and GitHub Actions, and adding end-to-end metrics like Northbound-to-Southbound sync. His hands-on contributions range from adding DNS support to the host-local IPAM and reordering portmap rules for compatibility to making libovsdb connect to OVSDB leaders with built-in metrics. He blends backend and DevOps engineering to ship pragmatic, production-grade fixes and tooling that make distributed networking systems easier to run and observe.

15 years of coding experience

Github Skills (51)

network-configuration10

kubernetes10

github-ci10

container10

dockerce10

rkt10

docker10

plug-ins10

kubernetes-apiserver10

api-design10

server-client10

testing10

github-actions-workflows10

kubernetes-networking10

cni10

Programming languages (16)

C++CSSRustCMakefileVueGoHTML

Github contributions (5)

containernetworking/plugins

Oct 2016 - Jan 2023

Some reference and example networking plugins, maintained by the CNI team.

Role in this project:

Backend & DevOps Engineer

Contributions:24 releases, 172 reviews, 115 commits in 6 years 4 months

Contributions summary:Casey contributed to the testing and compatibility of the CNI plugins by testing newer plugins with older libcni versions, ensuring backward compatibility. They added a feature to the host-local IPAM plugin to support DNS configuration via the `resolvConf` argument. Additionally, the user made changes to the portmap plugin, altering the order in which portmap rules are added. They also updated the CNI dependencies and made build and test configuration changes.

ospfnetworkingbgpsdnkubernetes

containernetworking/cni

Oct 2016 - Jan 2023

Container Network Interface - networking for Linux containers

Role in this project:

DevOps Engineer

Contributions:8 releases, 91 reviews, 45 commits in 6 years 4 months

Contributions summary:Casey primarily contributed to the improvement of the CI/CD pipeline and build processes. Their work involved migrating from Travis to GitHub Actions, adding go.mod, refining plugin-finding logic, and enhancing the test execution scripts. These changes streamline the testing and build process, supporting the container networking project.

containersnetwork-interfacenetworkinglinuxdocker

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