Jonathan Janzen
Staff Software Engineer at Meta
Seattle, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolJonathan Janzen is a Staff Software Engineer in Seattle with 12 years of experience building developer tooling, CI/CD and backend systems at scale, currently at Meta. He specializes in automation, build & release engineering and backend development, with notable open-source contributions that improved PyTorch’s release pipeline and added async-first capabilities to Django. Jonathan’s work spans languages and ecosystems—from enhancing the Relay compiler and Pyre type checker to adapting Folly for Buck2—showing a rare blend of infrastructure, compiler/ tooling, and framework-level fixes. He has a track record of improving developer experience (LSP goto-definition, live queries) and reliability (robust CI cherry-picking, build target pruning) in widely used projects. Practical, detail-oriented, and comfortable working across codebases, he often focuses on the plumbing that makes large-scale projects ship more smoothly.
12 years of coding experience
3 years of employment as a software developer
Bachelor’s Degree Computer Science, Bachelor’s Degree Computer Science at Texas A&M UniversityOakmont High School
Github Skills (51)
asynchronous10
git10
javascript10
static-analysis10
type-check10
python10
async10
django10
build-system10
bash10
wpgraphql10
cicd10
typechecker10
asyncio10
relayer10
Programming languages (27)
Github contributions (5)
django/channels
Apr 2024 - Aug 2025
Developer-friendly asynchrony for Django
Role in this project:
Back-end Developer
Back-end DeveloperContributions:34 reviews, 18 PRs, 11 pushes in 1 year 4 months
Contributions summary:Jonathan contributed to the Django Channels project by addressing bugs related to database connections and session management. They refactored code to use async session APIs when available, and also fixed database connection closing issues during testing. Additionally, the user implemented changes to improve the project's documentation and async support, updating core features and fixing minor bugs.
django
facebook/folly
Aug 2020 - Apr 2022
An open-source C++ library developed and used at Facebook.
Role in this project:DevOps Engineer & Build Engineer
DevOps Engineer & Build EngineerContributions:1 review, 4 commits, 22 PRs in 1 year 8 months
Contributions summary:Jonathan primarily focused on adapting the Facebook Folley library to be compatible with the Buck2 build system. Their contributions involved modifying build scripts and configurations, specifically for enabling and adapting Buck2 for the project. The changes include restricting build targets, fixing dependencies within the new build system, and improving the build process for homebrew packages. These modifications aimed at improving OSS builds, which led to changes in third-party dependencies and the overall build configuration.
cpp
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