I can't believe how fortunate I was to work on this book with so many great people. I would like to say thank you to Ellen Bishop, who gave me the opportunity to write it, and Owen Roberts and Shubhangi Dhamgaye, who have led me in my first adventure as a writer. Also to Christian Droulers, I have learned very much with his reviews.

Firstly, I would like to say thank you to my family; they have always supported my dreams and have given me the freedom to fail and succeed by myself, and they have always been by my side taking care of me.

To my girlfriend, Teresa, who supported me in those hard days when I thought all is going to fall because I had work all around and just 24 hours in a day. She is my stone and my stability.

I would like to extend my gratitude to all the people I have learned something from: Manuel Ciges, who gave me the responsibility of making a full production application, and Marcos Fernández, my partner through that trip at Vigilant. Rafael Crisanto from Rc Informática, who gave me my first opportunity as a web developer. Pedro García, Pablo Deeleman, Javier Gómez, Fran Iruela, and Alfonso Fernández, my partners at Dreamstar Cash. Guys you made that time the best of my life and you have made me a better developer.