Clean and SOLID code is sustainable code. It’s readable, it’s testable, and it’s a joy to maintain. Sounds great. But no matter how hard we try, too often our projects end up with code that somehow works, but is not very well tested, and cannot be modified easily. So is "clean and SOLID" just a fake promise, or maybe an appealing idea that is not economically feasible? In this session, we will discover what really makes the difference between sustainable code and more expensive code. You will also learn how to sell sustainability and code quality to your customer, your boss, and your colleagues.