I would personally like to thank my girlfriend Elina who has turned my life around in the last two years and encouraged me to take up the task of reviewing this book.

Joel Purra started toying around with computers even before he was in his teens, seeing them as another kind of a video game device. It was not long before he took apart (sometimes broke and subsequently fixed) any computer he came across while playing the latest games on them. It was gaming that led him to discover programming in his early teens when modifying a Lunar Lander game triggered an interest in creating digital tools. Soon after getting an Internet connection at home, he developed his first e-commerce website, and thus his business started; it launched his career at an early age. At the age of 17, Joel started studying computer programming and an energy science program at a nuclear power plant's school. After graduation, he studied to become a second lieutenant telecommunications specialist in the Swedish Army before moving on to study for his master's of science degree in information technology and engineering at Link?ping University. He has been involved in start-ups and other companies—both successful and unsuccessful—since 1998, and he has been a consultant since 2007. Born, raised, and educated in Sweden, Joel also enjoys the flexible lifestyle of a freelance developer, having traveled through five continents with his backpack and lived abroad for several years. A learner constantly looking for challenges, one of his goals is to build and evolve software for broad public use. You can visit his website at http://joelpurra.com/.