Jaap Frolich
Principal Engineer at Tella
Utrecht, Utrecht, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolJaap Frolich is a Principal Engineer based in Utrecht with 15 years of experience building product-focused web and mobile software and leading engineering teams from startup to acquisition. He combines a strong foundation in econometrics and industrial design with hands-on front-end expertise, contributing to notable open-source projects like ReScript React Native bindings and the rich-markdown-editor to improve component safety, animation behavior, and theme-driven UI. As a serial founder and former CTO, he has repeatedly taken products from concept to exit while later scaling engineering organizations at Walnut and now Tella. Jaap is comfortable shipping pragmatic fixes and architecture changes alike, and he brings a designer’s attention to UX alongside rigorous data-driven decision making. An often-understated strength is his cross-disciplinary fluency—bridging product design, analytics, and engineering—to turn ambiguous problems into shipped features.
15 years of coding experience
15 years of employment as a software developer
MSc Econometrics, MSc Econometrics at Erasmus University RotterdamMSc Strategic Product Design, MSc Strategic Product Design at Delft University of Technology
English, French, German, Chinese
Github Skills (15)
editors10
rescript10
javascript10
react-native10
front-end-development10
editor10
react10
markdown-it9
markdown9
prosemirror9
typescripts8
typescript8
typescript-types8
ui-design8
web-content7
Programming languages (19)
Github contributions (5)
rescript-react-native/rescript-react-native
Oct 2019 - May 2021
ReScript bindings for React Native
Role in this project:
Front-end Developer
Front-end DeveloperContributions:10 commits, 12 PRs, 2 pushes in 1 year 7 months
Contributions summary:Jaap primarily contributed to the development of React Native components within the ReScript ecosystem, focusing on improving the usability and functionality of existing components like `SectionList` and `Animated`. Their work included parameterizing types for enhanced code safety, fixing bugs related to animated components, and adding features such as web-specific properties to touchable elements. They also upgraded the project to a newer version of the reason-react library.
reactreact-nativereason-reactrescript-reactrescript-react-native
outline/rich-markdown-editor
Aug 2018 - Aug 2018
The open source React and Prosemirror based markdown editor that powers Outline. Want to try it out? Create an account:
Role in this project:Front-end Developer
Front-end DeveloperContributions:10 commits, 3 PRs, 10 comments in 1 day
Contributions summary:Jaap focused on enhancing the React-based markdown editor's functionality and theme customization. Their work included removing deprecated lifecycle methods, integrating the ability to selectively hide toolbar buttons based on the theme, and fixing a bug within the formatting toolbar. Furthermore, the user updated the project's dependencies and adjusted the UI to fit the design constraints.
reactreact-sourcewysiwygjavascriptprosemirror
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