Matt Johnson-pint
Principal Systems Engineer at Cloudflare
Woodinville, Washington, United States
Summary
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RockstarMatt Johnson-pint is a Principal Systems Engineer with 15 years of experience building AI-powered runtimes, developer frameworks, and cloud-native infrastructure across startups and large enterprises. He combines hands-on systems work in Go, TypeScript, and C# with leadership roles that shape architecture, developer tooling, and operational reliability. His recent work includes building a WebAssembly-sandboxed runtime and actor-model system for AI agents, plus bringing containers to the Cloudflare Workers platform. A prolific open-source contributor, Matt has improved time and timezone handling across .NET and popular JavaScript libraries (moment, nodatime) and authored utility libraries like TimeZoneConverter. He pairs deep low-level engineering—memory marshaling into WASM, SDK codegen, and runtime performance—with product-focused delivery, having also led SDK efforts at Sentry and large-scale reliability projects at Microsoft. Based in Woodinville, WA, he brings a practical inventor’s streak (patented time-zone automation at Microsoft) to solving messy production problems.
15 years of coding experience
24 years of employment as a software developer
Stackoverflow
236,159reputation
24.5mreached
2,963answers
75questions
azure
top-5%
firefox
top-5%
localization
top-5%
browser
top-1%
xunit
top-5%
serialization
top-5%
Github Skills (133)
nuget10
error-reporting10
datetime10
sentry10
website-development10
testing10
test-framework10
asp-net10
deserialization10
http-client10
entity-framework10
specification10
file-processing10
netcore10
timezone10
Programming languages (25)
Github contributions (5)
mattjohnsonpint/TimeZoneConverter
Jan 2017 - Nov 2022
Lightweight libraries to convert between IANA, Windows, Rails, and POSIX time zones.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:26 releases, 187 commits, 44 PRs in 5 years 10 months
Contributions summary:Matt primarily focused on developing the back-end logic for the time zone converter library. Their contributions included data extraction from XML files, including mappings and aliases, and implementing methods to load and process time zone data. Furthermore, the user updated and refactored code related to overrides, particularly for edge cases in time zone conversions. This involved integrating external data sources and improving the overall accuracy and reliability of the time zone conversion functionality.
posixwindowsrailstime-zoneszones
mspnp/performance-optimization
Feb 2015 - Apr 2015
Guidance on how to observe, measure, and correct common issues in a cloud-based system.
Role in this project:Back-end Developer
Back-end DeveloperContributions:179 commits, 5 PRs, 11 pushes in 2 months
Contributions summary:Matt's contributions focused on updating NuGet packages, refactoring code for readability, and improving the project's structure. They modified .csproj files to update dependencies and used more modern coding patterns, such as using blocks. The commits also included the use of synchronous write methods and refactoring for better readability, showcasing an emphasis on code quality and maintainability.
correctperformance-optimizationcloud-applicationscaleanti-patterns
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