Johnny O'reilly
Software Engineer at Priou
London, England, United Kingdom
Summary
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RockstarJohnny O'reilly is a Software Engineer based in London with 13 years of experience building developer tooling and web applications, with deep expertise in TypeScript, webpack, and OSS ecosystems. He contributes regularly to high-profile projects like webpack, Docusaurus, and ts-loader, improving TypeScript typings, build tooling, and documentation UX to benefit thousands of users. Johnny blends front-end skills (React, UI components, lazy-loading) with build-system and infrastructure work (webpack plugins, TypeScript compilation, Azure/Bicep), making him effective across the full stack. His open-source focus includes enhancing developer experience—refactoring structured data for SEO, adding JSON-LD support for blogs, and fixing complex type-checking and compilation issues. Colleagues know him for shipping practical fixes that ripple across ecosystems (e.g., types and tooling changes in widely used projects) and for communicating through blogs and talks. He balances hands-on engineering with community impact, often tackling subtle build and type-system edge cases that improve reliability for other maintainers.
13 years of coding experience
Stackoverflow
6,001reputation
1.4mreached
51answers
37questions
docker
top-5%
azure
top-5%
Github Skills (49)
javascript10
seo10
website-development10
testing10
open-source10
typescript10
typescript-definitions10
bundle10
webpack10
webpacker10
typescript-types10
loader10
flux10
fluxor10
docusaurus10
Programming languages (21)
Github contributions (5)
TypeStrong/ts-loader
Dec 2015 - Jan 2023
TypeScript loader for webpack
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:135 releases, 87 reviews, 607 commits in 7 years 1 month
Contributions summary:Johnny primarily focused on improving the TypeScript loader for webpack, addressing issues in compiling project references. They were involved in fixing bugs related to incorrect output and adding support for newer TypeScript versions (3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8). They also implemented features like dynamic import code splitting and tested the functionality of allowJs and different compilation errors. The user's contributions span various areas of the project.
resolvecompilationwebpack-loaderhtml-webpack-pluginwebpack
microsoft/TypeScriptSamples
Nov 2015 - Mar 2017
Community Driven Samples for TypeScript
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:15 commits, 15 PRs, 37 comments in 1 year 4 months
Contributions summary:Johnny primarily contributed to the front-end development of the project, focusing on React, TypeScript, and the implementation of UI components. Their work involved integrating with a Flux architecture, as evidenced by modifications to stores, actions, and component interactions. The user also made changes to build processes, including webpack configuration and the upgrade of dependencies and tooling, suggesting some involvement in the overall project structure.
community-driventypescript
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