Mark is a professional software engineer with 16+ years experience, recently branching into mobile development (iOS, Android, and React Native/Mobile).
He works with Ruby, Rails (and other Ruby frameworks), Python (Django since pre-1.0), JavaScript, Node.js, React, Redux, C#, Java, C++, C, Objective-C, Swift, Angular--and don't forget Unity3D. What he does not know, he learns quickly and implements even quicker.
His favorite part of the job is the constant learning and he loves to contribute to open source projects. He is the author of several RubyGems (Taggregator and Clortho being the most popular) and submitted a bug fix that was patched into Rails core.