Jos De Jong
Senior Software Engineer at Jos de Jong Software Ontwikkeling
Randstad, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolJos De Jong is a Senior Software Engineer with over 14 years of professional experience and two decades of programming practice, blending pragmatic engineering with a strong attention to detail. He builds developer-focused web tools and libraries, contributing significantly to well-known open-source projects like vis.js and mathjs and creating utilities such as a Svelte-based JSON editor. Comfortable across front-end and back-end work, he has implemented core worker-pool logic, performance-focused timeline refactors, and user-facing features like find/replace and context menus. Based in the Randstad, Netherlands, he designs iterative, user-involved applications and enjoys exploring JavaScript, Python, and Kotlin to keep tooling fun and efficient. His background in systems and control (M.Sc., TU Delft) informs a methodical approach to problem solving, and he routinely surfaces creative ideas at unpredictable moments—often in the shower.
14 years of coding experience
13 years of employment as a software developer
TU Delft
English, Dutch
Stackoverflow
6,711reputation
654kreached
144answers
29questions
javascript
top-5%
math
top-5%
Github Skills (28)
javascript10
json-editor10
webworker10
es6-promise10
css10
browser10
ui-design10
refactor10
uid10
commonjs10
front-end-development10
html10
nodejs10
svelte10
refactoring10
Programming languages (20)
Github contributions (5)
josdejong/svelte-jsoneditor
Jan 2021 - Jan 2023
A web-based tool to view, edit, format, repair, query, transform, and validate JSON
Role in this project:
Front-end Developer
Front-end DeveloperContributions:29 reviews, 799 commits, 154 PRs in 2 years
Contributions summary:Jos primarily contributed to the user interface and functionality of the JSON editor. They fixed linting issues, unified methods for content handling, corrected styling problems, renamed components, and implemented core features like expanding/collapsing, the context menu, and the find/replace feature. Their work involved modifying Svelte components and the underlying JavaScript logic of the editor.
queryvalidate-jsontransformjavascriptsvelte
josdejong/workerpool
May 2014 - Jan 2023
Offload tasks to a pool of workers on node.js and in the browser
Role in this project:Back-end Developer
Back-end DeveloperContributions:61 reviews, 238 commits, 173 PRs in 8 years 9 months
Contributions summary:Jos implemented the core functionality of a worker pool for Node.js and the browser, including offloading tasks to workers and managing their execution. They created classes for managing a pool of workers, as well as a separate worker handler to manage individual workers. They also added functionality for managing errors and promise based results.
nodejs
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