Jannis Hessel

Berlin, Germany

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Summary

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Jannis Hessel is a versatile web developer with 12 years of professional experience and a strong foundation in physics from TU Berlin, combining analytical rigor with creative, interdisciplinary thinking. He transitioned into web development via DCI and quickly demonstrated rapid learning and teaching ability—former classmates assumed he was the instructor after mastering HTML/CSS/JavaScript during the course. Jannis contributes to notable open-source projects such as Material-UI and Tabulator, where he has improved accessibility, documentation, and Semantic UI styling, and has refined backend tooling in npm-check-updates. Comfortable presenting complex concepts from his tutoring background, he excels at translating user-facing design details into polished UI behavior while keeping an eye on maintainable code. Based in Berlin, he seeks roles that leverage his fast-learning mindset, interdisciplinary curiosity, and hands-on open-source contributions.

12 years of coding experience

web development, web development at DCI Digital Career Institute gGmbH

Masters study, Physics, Masters study, Physics at Technische Universität Berlin

Stackoverflow

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1reputation

0reached

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Github Skills (21)

javascript10

react-components10

npm10

css10

material-ui10

datatable10

react-component10

datatables10

semantic-ui10

html-table10

tabulator10

react10

widgets9

ui-design9

typescript9

Programming languages (17)

MDXPowerShellCSSRustVueGoHTMLKotlin

Github contributions (5)

raineorshine/npm-check-updates

Mar 2019 - Mar 2022

Find newer versions of package dependencies than what your package.json allows

Role in this project:

Back-end Developer

Contributions:2 reviews, 11 commits, 5 PRs in 3 years

Contributions summary:Jannis primarily contributed to the back-end logic of the `npm-check-updates` project, focusing on refining and extending the core functionality. Their contributions involved updating and fixing the underlying JavaScript code, modifying parameters, and adding additional details to the documentation. The user also worked on adjusting the overall structure and the behavior of the application by adding filtering features.

dependenciesnpm-check-updatespackage-jsonnpm-clinodejs

mui/material-ui

Nov 2017 - Aug 2020

Material UI: Comprehensive React component library that implements Google's Material Design. Free forever.

Role in this project:

Front-end Developer

Contributions:7 commits, 8 PRs, 53 comments in 2 years 9 months

Contributions summary:Jannis contributed to the Material UI component library by updating and modifying UI components, primarily focusing on documentation and prop types. The user updated existing component documentation, such as TextField and SpeedDialAction, and corrected how various components use aria attributes, such as aria-owns. They also switched the order of buttons in the snackbar demo. The changes involved working with React, TypeScript, and Material UI components.

reactmuimaterialjavascriptmaterial-design

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