Author of the ARION running app. A comprehensive app with extensive Google/Apple maps usage and background Bluetooth  communication and geo-tracking.

Some notable achievements: 
- Custom native bluetooth communication and geo-tracking (background)
- 60 fps animations using web-gl
- various native contributions (react-native-map, react-native-tts, gl-react-native, react-native-device-info, react-native-background-timer) 
- Comprehensive text-to-speech system
- Advanced animations & interactions
- Author of react-native-bundle-visualiser
- Author of react-native-magic-move

I'm a full-time JavaScript developer, which means it is my language of choice and I tend to use it for nearly everything these days. Everything from developing react-native apps (my main focus), React-js websites, Node-js automations and Firebase Lambda Functions. I've authored many closed source libraries and occasional have time for open-source libs. I believe in automating as much as possible and properly documenting libs/apps as much as possible. I have become a true believer of unit tests and prettier-js.

Some notable open source projects I've authored:
- AutoLayout.js (Apple's auto-layout for JavaScript)
- Firestorter (firestore/react bridge using Mob-X)
- Kiwi.js (mathematical constraint solver)
- react-tag-cloud (animatable word clouds for React/DOM)
- react-native-bundle-visualiser (see what is increasing your react-native bundle size)
- node-web-bluetooth (interactive device picker and web-bluetooth API for node.js)
- famous-flex (layouts & animations)

Similar to Java, I only tend to write Objective-C when I need to write/fix native code for React-native. In the past I have authored the Flow-Xpert App, written entirely in Objective-C and C++. 

Some notable experiences:
- Flow-Xpert Native App
- Extended react-native-maps with snapshot & gradient polylines support
- Various native contributions to react-native-device-info
- Fixes and enhancements to react-native-tts
- Wrote new API for react-native-background-timer
- I'm quite knowledgable about X-code

I'm not a Java developer but I know my way around it when I need to (I find it a horrible language to be honest, yay for Kotlin ;). I only code in Java when I need to write/fix Native code for react-native.

Some notable work:
- Custom native Background Bluetooth stack for react-native (Arion Run app)
- Fixed some complex crashes in gl-react-native due to multi-threading issues
- Added snapshot support for react-native-map
- Various native contributions to react-native-device-info
- Fixes and enhancements to react-native-tts
and more..

I was a hardcore C++ dev for a large part of my carreer. I don't do any C or C++ anymore these days, but I could if needed.
I've worked on various industrial automation products (WinCE & desktop) written in C++, as lead/core developer and software architect. I designed and built everything from hot-swappable redundancy solutions, to custom UI's using GDI+. These products were built using Visual Studio (6 - 2008), using STL and MFC. 

I've authored various libraries and apps for famo.us, amongst: TalentDater, Firstrade, famous-flex, famous-map (google-maps integration), and various smaller projects and libraries.  Famo.us is new, it's bouncy, it's fun, and it's conquering the world. I believe in this technology as a great solution for writing cross-platform apps, and I'd like to contribute my part.

React-native specialist,  Javascript pro, Tech-Lead, Open-source contributor, React / Node-js / Full-stack (serverless) developer

Hein Rutjes

Author of the ARION Running App which connects to Bluetooth smart insoles and provides live coaching feedback. A comprehensive mobile App for which I also authored many internal libs such as the data-format and open-gl shaders. During this project many contributions to react-native libraries were made to achieve the project goals.

ARION Run

Apple's Auto Layout and Visual Format Language for javascript (using cassowary constraints)

I initially build this library to solve layouting for the famo.us framework. This was very time consuming for complex layouts. I created the famous-autolayout integration and a visual format editor to address these issues. As I realized that the autolayout and visual format language would also be usefull for other frameworks, I decided to release this as a standalone library. Later on I also added better performing constraint-solver called kiwi.js

Autolayout.js

Authored the StageHound Mobile App & Website using famo.us technology and JavaScript. Unfortunately the start-up did not make it and the app and web-site are no longer live.

During this project and in my free time I built the Autolayout.js library to solve a complex and time consuming problem with famo.us. Layouting was very difficult and a new approach was created using EVFL (extended visual format language) to express layout in an efficient and mathematical manner. I also built a Visual format Editor to help building responsive layouts.

StageHound App

iPad App built using JavaScript, famo.us and Cordova to view rouw-collecties. For this app, I also built a tool to export Adobe InDesign files to pixel perfect HTML files.

RouwCollectie iPad App

Flow-Xpert is a comprehensive library of certified flow and fluid property calculations used in flow and level measurement systems.

My first mobile App. Available for both iOS and Android, supporting both phone and tablet resolutions.

Personal details

Hein R.

Summary

Technical skills

Personal Projects