I can hack together a prototype and bring designs to life using JS/CSS/HTML (web) or Swift (iOS). I may not know how to do something right away, but you can bet I'll have a good time diving into Stack Overflow until I figure it out. If there is a need to test something faster, I'm also comfortable using paper prototypes, InVision, and Axure. 

 
 
iOS Prototype for a lottery app concept

iOS Prototype for a lottery app concept

iOS Prototype of a cards-based navigation

iOS Prototype of a cards-based navigation