Stephen Niedzielski
Staff Software Engineer at Reddit, Inc.
Denver, Colorado, United States
Summary
🤩
Rockstar🎓
Top SchoolStephen Niedzielski is a Staff Software Engineer with 14 years of cross-platform experience building web, mobile, and game systems, currently driving engineering at Reddit after senior roles at Meta and Wikimedia. He led the small team reimagining Wikipedia’s desktop experience with Vue.js and shipping measurable improvements like Wikidata-based SEO and server-side A/B tests that boosted traffic, and previously overhauled Wikipedia’s Android app features such as offline mode and the explore feed. Equally comfortable in frontend and backend, he contributes to high-profile open-source projects like mediawiki and DefinitelyTyped, improving TypeScript typings for Jest and front-end UX in MediaWiki. A creator at heart, he builds personal projects—an isometric WebGL game he’s porting to Rust/Wasm—bringing a blend of pragmatic engineering, design sensibility, and attention to long-term maintainability.
14 years of coding experience
13 years of employment as a software developer
BS, BS at DigiPen Institute of Technology
Stackoverflow
2,587reputation
1.2mreached
43answers
6questions
Github Skills (28)
mediawiki10
typesc10
javascript10
css10
typescript10
typescript-definitions10
user-interface10
type-definition10
type-system10
jestjs10
typescript-types10
typescripts10
xamarin-android9
mongoose9
webpacker8
Programming languages (26)
Github contributions (5)
wikimedia/mediawiki
Mar 2018 - Apr 2020
🌻 The collaborative editing software that runs Wikipedia. Mirror from https://gerrit.wikimedia.org/g/mediawiki/core. See https://mediawiki.org/wiki/Developer_access for contributing.
Role in this project:
Front-end Developer
Front-end DeveloperContributions:10 commits in 2 years 1 month
Contributions summary:Stephen primarily contributed to the front-end of the MediaWiki project, specifically focusing on the Special:Preferences page. Their work included enhancing skin preferences, showing/hiding skin sections based on selection, and adding JavaScript utilities for the "checkbox hack". They also addressed UI issues by removing a redundant OOUI override and clarified selectors. Furthermore, the user made minor documentation updates.
wikimediaphpwikipediacollaborative-editingruns
DefinitelyTyped/DefinitelyTyped
Feb 2019 - May 2019
The repository for high quality TypeScript type definitions.
Role in this project:Back-end Developer
Back-end DeveloperContributions:7 commits, 2 PRs, 6 comments in 3 months
Contributions summary:Stephen primarily contributed to improving the type definitions for the Jest testing framework within the definitelytyped repository. They refactored the `.each()` method by introducing template-based solutions, replacing `any` types with more specific templates for enhanced type safety. Additionally, the user integrated the `Merge: upstream/master` changes, incorporating various updates to type definitions for office-js-preview, mongoose, babel-types, lodash/fp, tern/lib/infer, dv, and webpack. These contributions demonstrate a focus on maintaining and improving the quality of TypeScript type definitions.
typescript-definitionstype-definitionshigh-qualitydtsdefinitions
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.