Justin Chadwell
Software Engineer at Dagger
Birmingham, England, United Kingdom
Summary
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Rockstar🎓
Top SchoolJustin Chadwell is a software engineer and final-year Computer Science student at the University of Birmingham with a decade of hands-on experience building developer tooling, build systems and container infrastructure. Currently at Dagger and formerly at Docker, he contributes to high-profile open-source projects—including BuildKit, containerd, buildx, Syft and Dagger—working on everything from heredoc parser primitives and engine stability to TLS support and SBOM fixes. He blends backend and DevOps expertise with a strong focus on developer experience and CI reliability, even standardising linting and documentation practices in Docker's docs. Earlier roles in security tooling at Pexip (continuous fuzzing and AddressSanitizer integration) and firmware work at Arm give him uncommon breadth from assembly-level boot code to cloud-native build ecosystems.
10 years of coding experience
2 years of employment as a software developer
A levels, Mathematics, Computer Science and English Language, A*A*A, A levels, Mathematics, Computer Science and English Language, A*A*A at Kathmandu International Study CenterBachelor of Science - BSc, Computer Science, Bachelor of Science - BSc, Computer Science at University of BirminghamIGCSEs, 9 A*s, and 1 A, IGCSEs, 9 A*s, and 1 A at Kathmandu Internation Study Center
Stackoverflow
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Github Skills (37)
dockerce10
container10
docker10
parser10
documentations10
buildkite10
testing10
sbom10
build-system10
containerization10
dockers10
containers10
containerd10
go10
ci-cd10
Programming languages (23)
Github contributions (5)
docker/buildx
Apr 2022 - Jan 2023
Docker CLI plugin for extended build capabilities with BuildKit
Role in this project:
Back-end Developer & DevOps Engineer
Back-end Developer & DevOps EngineerContributions:425 reviews, 139 commits, 265 PRs in 9 months
Contributions summary:Justin primarily contributed to the `docker/buildx` repository by addressing build-related issues and enhancing the tool's capabilities. They implemented changes to the imagetools commands, ensuring the correct handling of the `--builder` flag and refactoring combining repository logic. The user also completed the remote driver by adding TLS support and improving the buildx create command. Furthermore, they updated dependencies and fixed code based on the golint results.
buildkitextendeddockercli-plugindocker-cli
dagger/dagger
Mar 2022 - Apr 2025
An open-source runtime for composable workflows. Great for AI agents and CI/CD.
Role in this project:Back-end and DevOps Engineer
Back-end and DevOps EngineerContributions:109 releases, 1582 reviews, 1412 PRs in 3 years
Contributions summary:Justin's commits primarily focus on improvements and maintenance within the Dagger project, specifically related to the engine's core functionality and its interaction with various external systems. The user has demonstrated a proficiency in enhancing the build process by addressing dependency updates and integrating with the BuildKit ecosystem. Furthermore, the user's contributions included fixing bugs that related to integration tests, improving the stability and reliability of the testing infrastructure, and building the foundation for other developers on the team.
containerscontinuous-deploymentcontinuous-testingbuildkitdeployment
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