This presentation was recorded at Voxxed Days Belgrade 2016 - https://belgrade.voxxeddays.com/ After 10 years of hard work experience in Java Enterprise applications, I started several years ago teaching various topics that I mastered (www.victorrentea.ro). Among all these topics, by far the most important topic, that I always include in all my training sessions is 'Clean Code'. It's essential to be able to keep 'alive' 100k-2M lines of code. And I was told that this module has the biggest impact in day-to-day life of the dev. Also, this talk will also show how a professional developer should behave in code, the 'ethics code' that ough to be followed by everyone. We will go from the most basic concerns like how should we choose our names, how should we write our functions, format and (not) comment them, to more advanced topics of true Objects. The entire presentation is spiced with numerous esay to understand examples and code snippets.