Jarrett Tierney
Software Engineer at AWS
Seattle, Washington, United States
Summary
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RockstarJarrett Tierney is a software engineer with five years of experience building backend and DevOps tooling, currently contributing as a Software Development Engineer II at AWS in Seattle. He works on Bottlerocket, the container-focused OS, where he’s improved core maintenance tools by migrating them from API-dependent flows to configuration-file driven designs and managing related dependency and migration work. Comfortable across systems and infrastructure, Jarrett focuses on making production automation more reliable and auditable, particularly around bootstrapping and update tooling. His hands-on contributions to a high-profile open-source OS demonstrate both production-scale engineering and thoughtful design for long-term maintainability. He brings a pragmatic approach to complex distributed systems, favoring clear configuration and resilient operational workflows.
5 years of coding experience
Github Skills (10)
configuration-management10
container10
rust10
devops9
linux9
go9
api8
operating-system8
apidoc8
systemd7
Programming languages (5)
Github contributions (5)
bottlerocket-os/bottlerocket
Jan 2024 - Jan 2026
An operating system designed for hosting containers
Role in this project:
Backend & DevOps Engineer
Backend & DevOps EngineerContributions:96 reviews, 54 PRs, 25 pushes in 2 years
Contributions summary:Jarrett primarily focused on updating the `certdog`, `prairiedog`, `thar-be-updates`, `corndog`, and `bootstrap-containers` tools within the repository. Their contributions involved migrating these tools to utilize configuration files for settings retrieval instead of relying on API calls. These changes include modifications to the tools' source code and migrations to accommodate new configuration file structures. Further work involved updating dependencies, adding migrations, and making adjustments related to the use of rendered configuration files.
operating-systemcontainerslinuxrust
jmt-lab/bottlerocket-kernel-kit
Dec 2024 - Jun 2026
Contributions:6 releases, 30 pushes, 8 branches in 1 year 6 months
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