Tango improved test coverage, migrated functionality to AngularJS, and created custom add-ons for ExpressionEngine.  

Tango improved test coverage from 0 to 80% while reducing technical debt applying SOLID principles.Migrated current Javascript functionality to AngularJS.

Created custom add-ons for ExpressionEngine then updated it from version 2 to version 3.5.4. Improved server side architecture by splitting responsibilities into standalone servers.