Senior iOS Engineer @ From March 2015 to Present (10 months) iOS Engineer @ From July 2014 to Present (1 year 6 months) Mobile Engineer @ • Overhauled iPhone app's codebase for improved performance, reliability, and reduced complexity. • Reduced app crashes from >50% of app launches and normal use to close to 0%. • Improved App Store rating from 2.5 stars to 3.5 stars and rising. • Developed heavily trafficked features of the app • Improved accuracy and robustness of back-end iTunes payment processing. • Designed REST APIs for mobile consumption • Developed on-demand iOS push notification system From February 2012 to January 2013 (1 year) Software Developer @ • Designed and implemented Ubiquitous Biology, a series of four games for mobile web. • Developed back-end logic and REST APIs with Ruby on Rails. • Implemented front-end using Sencha Touch and Flash. • Ported entire Rails back-end to Django. • Experimented with WebSockets for real-time multiplayer component. From June 2010 to December 2011 (1 year 7 months)

M.Eng, Computer Science @ Massachusetts Institute of Technology From 2013 to 2014 Bachelor of Science (B.S.), Computer Science @ MIT From 2007 to 2011 Fidel Sosa is skilled in: Software Engineering, iOS development, Objective-C, Cocoa Touch, Java, Ruby, Ruby on Rails, Python, User Interface Design, JavaScript, User Experience, REST, Agile Methodologies, Git, JSON