Fidel Sosa's Email Addresses & Phone Numbers

Software Engineer, iOS @ Instagram San FranciscoMobile Engineer @ eHarmony.com • 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...

Software Engineer, iOS @ Instagram San FranciscoMobile Engineer @ eHarmony.com • 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 @ MIT Scheller Teacher Education Program • 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) Principal iOS Engineer @ OpenTable • Led the Guest Center iOS team as lead developer.• Built and grew a team of 6 experienced and junior iOS developers.• Implemented a robust continuous integration (CI) and testing environment to ensure app stability and speed up development.• Drove the expansion of unit, integration, and acceptance testing in the team and stressed the business impact to ensure organizational buy-in.• Architected and developed the reference iOS implementation of the core OpenTable reservation availability engine.• Instituted popular weekly developer knowledge-shares to enhance team communication and promote learning.• Mentored developers in topics in iOS (e.g. Objective-C, Swift, Core Data) and general engineering (e.g. system design, best practices).• Worked closely and collaboratively with developers to design team development standards and best practices. From July 2016 to August 2018 (2 years 2 months) San Francisco Bay AreaSenior iOS Engineer @ OpenTable • Designed core Guest Center system APIs for use by all client applications.• Instituted code review process and defined documentation standards to improve robustness and clarity of the codebase.• Re-architected the networking, synchronization, and authentication systems to greatly simplify the codebase and and expand functionality.• Managed and mentored engineering interns in product design and software engineering.• Drove and led the adoption of Swift in production for the team. From March 2015 to July 2016 (1 year 5 months) San Francisco, CAiOS Engineer @ OpenTable • Developed impactful, large-scale, and profit-driving features for restaurants, such as waitlist quote time estimation and shift timeline.• Implemented iOS real-time synchronization system and defined the API.• Worked closely with product managers and designers to design, develop, and iterate on product features and user experience.• Automated key parts of our deployment pipeline to speed up the app submission process. From July 2014 to March 2015 (9 months)