Ravi Shankar is a multi-skilled software consultant with over 15 years of experience in the IT industry. He has good all-around ability in different technologies and extensive experience in product development, system maintenance, and support. He is a polyglot and self-taught programmer with hands-on experience in Swift, Objective-C, and Java. Ravi believes in gaining knowledge through sharing and helping others learn.

Tatsuya Tobioka is a software engineer familiar with Ruby, JavaScript, Objective-C, and Swift. He lives happily with his beloved wife and children in Tokyo, Japan.

He started iOS development in 2010, and then released a number of apps for developers, such as JavaScript Anywhere, Edhita, and CoffeeScript At Once.

Currently, Tatsuya spends much of his time learning tvOS.

You can check out his open source projects on GitHub at https://github.com/tnantoka and tweets at @tnantoka.

Ye Xiaodong is a full-stack software engineer and technical director of zai360.com (http://www.zai360.com/), an O2O company that provides recyclable collection services for Chinese family customers on a periodical basis. He has 7 years of application development experience working for start-ups and leading companies across the world with iOS, Android, Windows Phone, Symbian, and Meego. He has developed lots of iOS applications; designed, created, and maintained iOS libraries and Xcode plugins; and contributed to open source projects. Ye is passionate about bringing the latest features into applications. He was a technical reviewer for Mastering Swift and Swift Design Patterns, Packt Publishing.