I have been in the field of GIS for 15 years and using ArcGIS products for just as long. I have been building custom ArcGIS applications for the desktop and browsers for 10 years. I am currently a software engineer at Esri working on the ArcGIS API for JavaScript, and before that worked in local government and freelance work. I keep current on almost all mapping technologies, from web based mapping tools to desktop data creation tools. I am also a huge fan of functional languages such as Haskell, Elm and PureScript. I have experience in .NET using C#. Python, and some C++. I know web technology, such as CSS, HTML5, plenty of JavaScript, multiple JavaScript frameworks, libraries and Node.