Shahin Katebi is a software architect and developer with 10 years of experience in creating apps for various platforms (Mac, iOS, Windows, and the Web). He works as a mobile solutions consultant with different companies in the business, marketing, and technical fields and also works with a few start-up teams worldwide. He teaches iOS/Mac OS development and as a mentor at Startup Weekend events, he helps start-up teams grow their own business. He is the founder and team leader at Seeb Co. (http://seeb.co/), a creative mobile app development organization that creates apps for customers around the world. He also runs and accelerates multiple start-up businesses in various fields worldwide.

Shahin has also helped with fact checking and technical editing for books such as iOS and OS X Network Programming Cookbook, Jon Hoffman, Packt Publishing.

Kirill Roskolii is a passionate open source PHP/Drupal backend developer. He started his programming career as a freelance web developer in 2006. Afterwards, he created a small web studio with a couple of schoolmates and worked in ShvetsGroup, Kiev. Currently, he works as a lead Drupal backend developer in Trellon, LLC, maintaining CRM Core and a few other projects on Drupal.org.

Shuvankar Sarkar is senior software engineer experienced in C#, .NET, PHP, and web development. He maintains his blog at http://shuvankar.com. Apart from official work, he is involved with several hobby projects (for example, http://tencovid.com). He is a member of Teamencoder (http://teamencoder.com). You can follow him on Twitter at @sonu041. Shuvankar is interested in computer security and Rubik's Cube.