BJ Peter DeLaCruz graduated with a master's degree in computer science from the University of Hawaii at Manoa. In 2011, he began his career as a software developer at Referentia Systems Inc. in Honolulu, Hawaii. At Referentia, he assisted in the development of the LiveAction product. After working at Referentia for 2.5 years, he was hired as a Java web developer by the University of Hawaii. Between fall 2014 and spring 2015 semesters, he upgraded Laulima (http://laulima.hawaii.edu), the learning management system that the university uses for traditional face-to-face, online, and hybrid classes.

BJ holds three Java certifications, including the Oracle Certified Master, Java SE 6 Developer certification.

He is a successful Android developer. As of January 2015, he has published seven Android apps on Google Play. His latest app, Chamorro Dictionary, is an excellent learning tool for the Chamorro language. You can check out his apps at http://tinyurl.com/google-play-bpd.

BJ really likes Gradle because it makes building applications very easy. He was a reviewer for Gradle in Action.

His hobbies include learning the Japanese language, reading books about Japanese culture, and making YouTube videos. You can contact him at <[email protected]>. You can also visit his website at http://www.bjpeter.com.

Noureddine Dimachk is a passionate video gamer since birth. Noureddine started building games using The Games Factory when he was just 10 years old.

Today, he leads a multinational team of 17 enthusiastic developers spread across Lebanon, Argentina, and India to build cutting-edge applications that serve millions of concurrent GSM subscribers, in addition to mobile applications.

A geek by nature, Noureddine likes to experiment with new technologies in his spare time, and he's a passionate Dota 2 player.

Miguel L Gonzalez is a Spanish software engineer working in the United Kingdom since 2010. He took his first programming course at the early age of eight, and it has been his main passion and hobby since then. He soon became attracted to the Web and Internet, which lead him to study telecommunications engineering.

He has worked as a researcher in the university, designing accessible hardware and wireless sensor networks, teaching web development, developing a mixture of Java hardware, desktops, and web apps, and is the head of development in an agency. Since the time he arrived in the UK, he has mainly focused on web and native development for mobiles, and he developed a few Android and iOS apps in coANDcoUK. In 2013, he joined BBC to work on iPlayer, BBC's catch-up service. It was here that he became more serious about unit testing, behavioral testing, and how to drive success via continuous integration.

He tries to keep improving his projects, which can be found at http://github.com/ktzar and maintain his personal website, http://mentadreams.com. Since his son Alex was born, the spare time for side projects has been reduced, but his wife, Dalia, helps him to find time for them. Nevertheless, he's looking forward to playing Monkey Island, designing games, playing the guitar, and traveling the world with his offspring in a few years time.

Henrik Kirk holds a master's degree in computer science from Aarhus University and has over 5 years of experience in Android application development. He is curious about new technologies and has been using Scala as well as Java for Android development. He also enjoys optimizing the user experience through speed and responsive design. He is currently employed as the lead developer at Lapio, creating an awesome timing and race experience for athletes in the US and Europe. In his spare time, he races his mountain bike.

Sérgio Lima is a software engineer and an airplane pilot. It's easy to see that he's a very ambitious person with broad and, at the same time, specific interests. He currently works at a Portuguese company that aims to revolutionize the world with telecom and mobile applications. His curriculum started with a master's degree in electronics and telecommunications and he specialized in computer programming and computer vision. After working at some institutions in Portugal, he worked at CERN in Switzerland, before returning to his home country.

He also loves to fly small planes, such as the Piper "Cherokee" and "Tomahawk", from the nearby aerodrome, to see Portugal from above, admire the radiant sceneries of the country, and experience the freedom of flying.

João Trindade is a software developer who specializes in developing Android apps.

Currently, he is part of a startup in Milan that tracks your mobile phone usage and suggests the best tariff plan for your needs.

He completed his PhD in computer engineering at Lisbon Tech and is interested in everything related to mobile development, software testing, docker containers, or cloud computing.

For 6 years he was a researcher involved in multiple international research projects and has published 18 peer reviewed articles.

His twitter handler is @joaotrindade and his personal web page is http://joaoptrindade.com.

He contributes to various open source products on GitHub. You can see his profile at http://github.com/joninvski.