Krzysztof NiksiĹ„ski is a Ruby On Rails developer from Warsaw, Poland. He has been a Ruby On Rails freelancer since 2003 and regrets that he started using HAML only four years ago in his projects, because it would have saved his lot of time and efforts. He loves to create web applications, which use multiple technologies in synergy, as well as configure all the underlying layers of the application servers, databases, and operating systems. Playing with all the systems that make Internet work is his daily bread and butter. He grew up in Warsaw, where he attended the Warsaw University of Technology. Later, he started to work as an Internet Systems administrator in a bank, where he learned all the details of Internet services and protocols. He later fell in love with Ruby and started his own Ruby On Rails development company. At the time of this writing he also works as a Middleware Infrastructure Administrator for Acxiom, a marketing technology and services company. Krzysztof spends his free time creating electronic music, playing basketball with his friends, or training his dog, Goofy.