Arnar Sveinsson
Co-founder CTO at Upsell
Iceland
Summary
🤩
Rockstar🎓
Top SchoolArnar Sveinsson is a co-founder and CTO with 11 years of full-stack engineering experience building products and teams from Reykjavík, Iceland. He pairs startup leadership at Upsell with deep hands-on development, previously contributing across engineering roles at AviLabs/Plan3, Gangverk, and consumer-facing companies like WOW air and Plain Vanilla Games. An active open-source contributor, Arnar has notably improved ReScript’s standard library—refactoring and extending its Option module—and updated ReScript React Native bindings, showing a focus on language-level ergonomics and cross-platform UI integrations. He brings a pragmatic engineering style that blends low-level performance improvements (uncurried functions) with developer experience enhancements (clearer APIs and examples).
11 years of coding experience
9 years of employment as a software developer
Bachelor of Science (B.Sc.) Computer Science, Bachelor of Science (B.Sc.) Computer Science at Reykjavik University
Swedish, English, Icelandic
Github Skills (12)
android-webview10
compiler10
rescript10
functional-programming10
compiler-compiler10
webview10
react-native10
react10
javascript9
accessibility9
flatlist8
altjs8
Programming languages (14)
Github contributions (5)
rescript-react-native/rescript-react-native
Jul 2017 - Aug 2018
ReScript bindings for React Native
Role in this project:
Front-end Developer
Front-end DeveloperContributions:8 releases, 39 commits, 23 PRs in 1 year 1 month
Contributions summary:Arnar primarily focused on updating ReScript bindings for React Native components. Their work involved renaming accessibility labels across multiple components and adding new webview bindings. They also made adjustments to various components, including FlatList, by reordering props and fixing namespace issues. Additionally, the user provided example implementations for webview.
react-nativerescriptreactrescript-reactrescript-react-native
rescript-lang/rescript
Nov 2017 - Apr 2018
ReScript is a robustly typed language that compiles to efficient and human-readable JavaScript.
Role in this project:Back-end Developer
Back-end DeveloperContributions:15 commits, 5 PRs, 9 comments in 5 months
Contributions summary:Arnar primarily focused on adding and refactoring the `Option` module within the ReScript (formerly BuckleScript) project. Their contributions included implementing core functionalities like `getExn`, `map`, `flatMap`, and related utilities. The user also made improvements by renaming functions for better clarity and added uncurried versions for improved compatibility and performance. Their work primarily involved modifying and enhancing the ReScript language's standard library.
javascriptrescriptcompileraltjs
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