Evan Czaplicki
Software Engineer
Summary
🤩
Rockstar
Top expert inFunctional Programming and Formal Verification Technologies
Evan Czaplicki is a software engineer with 11 years of experience best known as the designer and developer of the Elm language, blending language design, compiler engineering, and front-end craftsmanship. He contributes across the full stack—improving Elm’s compiler type system and error messages, maintaining the Elm website and guide, and evolving example apps like TodoMVC and an Elm architecture tutorial to stay current with new releases. Evan’s work emphasizes developer ergonomics and reliable webapps, including creating an inline REPL and polishing UI details such as focus management and keyed HTML updates. Less obvious is his sustained focus on clear, actionable type errors and modular examples that make functional programming approachable to everyday web developers.
11 years of coding experience
Stackoverflow
31reputation
1kreached
1answer
0questions
Github Skills (32)
textbook10
storybook10
ui-components10
css10
user-manual10
guideline10
elm10
user-guide10
type-system10
docbook10
compiler-design10
front-end-development10
html10
error-handling10
web-development10
Programming languages (12)
Github contributions (5)
evancz/elm-todomvc
Jun 2016 - Dec 2019
The TodoMVC app written in Elm, nice example for beginners.
Role in this project:
Front-end Developer
Front-end DeveloperContributions:25 commits, 24 PRs, 44 pushes in 3 years 5 months
Contributions summary:Evan primarily focused on improving the front-end of the TodoMVC application built in Elm. Their work included updating the UI to use `Html.Keyed`, incorporating the latest CSS styles, and updating the code to align with newer Elm versions. The user also addressed issues related to focus management and initialization within the HTML structure of the application.
elmtodomvcfor-beginners
elm/compiler
Jun 2015 - Sep 2022
Compiler for Elm, a functional language for reliable webapps.
Role in this project:Backend Developer
Backend DeveloperContributions:6 releases, 1 review, 1851 commits in 7 years 4 months
Contributions summary:Evan primarily focused on modifying and refining the type system within the Elm compiler. Their contributions involved refactoring the unification process, improving the presentation of type errors, and refining how type aliases are handled. The work included creating more specialized error messages and ensuring correct handling of various type scenarios, such as records and operators, to improve the debugging and error-reporting capabilities of the compiler.
functional-languageelmreliablecompilerwebapps
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.