Rene Rubalcava has been working in the field of GIS about 15 years now and has been developing custom applications for most of that time. He managed custom GIS development for the LA County Sanitation Districts, has done some consulting and freelancing over the years, and has been working for Esri since 2015. He works on the ArcGIS API for JavaScript and other projects. He maintains a blog, ODE.net, on spatial development, particularly focused on the ArcGIS API for JavaScript, and he runs an active YouTube channel. He also wrote a book on the previous version of the API, ArcGIS Web Development (Manning, 2014).