Simon Holthausen
Software-Entwickler, Svelte Maintainer at Vercel
Frankfurt Rhine-Main Metropolitan Area Germany
Summary
🤩
Rockstar🎓
Top SchoolSimon Holthausen is a seasoned software engineer with 11 years of experience, currently maintaining Svelte at Vercel and based in the Frankfurt Rhine‑Main area. He specializes in modern web frontends and full‑stack SvelteKit work, having led migrations, TypeScript improvements, and UX enhancements for flagship projects like learn.svelte.dev, svelte, and sveltekit. His contributions span polishing core framework features, tightening type safety, and integrating developer tooling (Prettier, ESLint), demonstrating both deep framework knowledge and practical DX focus. Prior roles at Accso combined consulting and senior engineering, giving him experience in shipping production systems and guiding teams. Simon’s work on high‑visibility open source projects (Svelte, Storybook, ngrx) shows he thrives at the intersection of developer tooling and robust frontend architecture.
11 years of coding experience
4 years of employment as a software developer
Technischen Universität Darmstadt
Github Skills (39)
javascript10
type-inference10
ngrx10
sveltekit10
back-end-development10
storybook10
routers10
ui-components10
component-development10
css10
configuration-management10
typescript10
router10
templater10
template-engine10
Programming languages (11)
Github contributions (5)
sveltejs/prettier-plugin-svelte
Aug 2020 - Dec 2022
Format your svelte components using prettier.
Role in this project:
Front-end Developer
Front-end DeveloperContributions:16 releases, 56 reviews, 104 commits in 2 years 3 months
Contributions summary:Simon primarily contributed to the sveltejs/prettier-plugin-svelte repository by addressing bugs and implementing improvements related to code formatting for Svelte components. They fixed issues related to handling JavaScript expressions within the formatting process, ensuring correct handling of single quotes and long attribute values. The user also introduced support for new features like the `{#key}` block and improved the printing of HTML template tags. Furthermore, the user worked on various code refactoring tasks and adjustments for alignment with Prettier's formatting behaviors.
svelte-componentssvelteprettiersveltejs
sveltejs/kit
Nov 2020 - Jan 2023
web development, streamlined
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:1736 reviews, 264 commits, 1065 PRs in 2 years 2 months
Contributions summary:Simon contributed to the development of the SvelteKit framework, focusing on improvements to the project setup and various core functionalities. They implemented features such as the ability to customize CSS preprocessors, integrated ESLint and Prettier for improved code quality, and added support for route-level configuration. Their work involved modifications to the core framework files, including adding new features and fixing bugs, and ensuring the framework's robustness and usability. They also contributed to the migration of Svelte 4 to Svelte 5.
svelte-kitsveltekit-adapterjavascriptsvelteweb-development
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