Javier Gamarra is a developer who's always eager to learn and improve.

He currently works as an Android developer at Liferay, and he has worked with many development stacks: JS (Angular, Node…), Java EE, Scala, and Python. He loves challenges and learning about data visualization.

In his spare time, he organizes conferences and meetups in @cylicon_valley, a tech meetup in Castilla y Leon to help spread better technical practices in other companies, and he's a member of the board of @agilespain, the Spanish Agile national association.

He is available everywhere on the Internet under the @nhpatt handle.

SeongUg Jung has been developing Android applications for consumers and enterprises since 2010. He started his career working at Daou Tech, developing various applications such as messenger, calendar, e-mail, and Mobile Application Management services (including web). In December 2014, he became the lead Android Developer at Toss Lab, Inc., an enterprise communications startup focused on the Asian market.

He has contributed to Android libraries such as Robolectric-Gradle and Engine-io-java-client, and given lectures on development, especially Agile.

His specialities include Android TDD, good architectures, Agile, XP, Cl and so on. He enjoys helping others, so feel free to ask for help.