Justin Cormack
Director at OpenUK
East Suffolk, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolJustin Cormack is a seasoned technology leader and security-focused engineer with 15 years building and hardening container infrastructure, most recently serving as CTO of Docker. He combines hands-on systems and runtime work—contributions to high-profile open-source projects like Docker, containerd, runc and LinuxKit—with strategic leadership across product and governance roles (including CNCF technical oversight and a non-exec director role at OpenUK). Justin’s expertise spans seccomp-based hardening, cross-platform portability, and low-level VM and networking integrations, reflecting deep comfort at the intersection of kernel, runtime and cloud-native tooling. Known for pragmatic modernization (e.g., migrating legacy boot systems to Alpine in LinuxKit) he blends research rigor (MSc Imperial College) with years of shipping production-grade security and runtime fixes at scale.
15 years of coding experience
21 years of employment as a software developer
William Ellis SchoolMSc Computer Science, MSc Computer Science at Imperial College LondonMA Economics, MA Economics at University of Cambridge
Stackoverflow
1,236reputation
173kreached
20answers
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apache
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http
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Github Skills (57)
container10
docker10
security-hardening10
seccomp10
system-programming10
it-security10
linux10
bash10
c1110
containerization10
dockers10
networking10
devtools10
virtio10
c1710
Programming languages (31)
Github contributions (5)
linuxkit/linuxkit
Nov 2015 - Apr 2021
A toolkit for building secure, portable and lean operating systems for containers
Role in this project:
DevOps Engineer
DevOps EngineerContributions:54 reviews, 3023 commits, 685 PRs in 5 years 5 months
Contributions summary:Justin's commits primarily focused on replacing the legacy boot2docker system with a more modern Alpine Linux-based environment. This involved modifying existing scripts and creating new ones to manage the boot process, configure networking, and handle container initialization. Furthermore, the user implemented changes related to the virtual machine's network configuration and incorporated support for Docker daemon restarts upon config updates. Their contributions advanced the project towards a more robust and maintainable container deployment infrastructure.
containerssecureoperating-systemsseccomplinux
notaryproject/notary
Jan 2016 - Oct 2022
Notary is a project that allows anyone to have trust over arbitrary collections of data
Role in this project:Back-end Developer
Back-end DeveloperContributions:29 reviews, 103 commits, 95 PRs in 6 years 11 months
Contributions summary:Justin updated the `jose2go` library, which is used for signing and encryption in the project. This involved updating dependencies, addressing build issues on ARM architecture, and fixing potential security vulnerabilities. The user also updated the Go version and sqlite bindings, and reworked the FIPS mode detection. The commits included code changes related to file structure and build scripts.
notarypythondockertrustarbitrary
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