Michael Feathers

Michael Feathers is a software consultant, author, and Chief Architect at Globant whose 2004 book 'Working Effectively with Legacy Code' redefined how developers think about untested code - coining the now-universal definition that legacy code is simply code without tests. With over 25 years consulting hundreds of organizations, he pioneered dependency-breaking techniques that gave teams a way into codebases they feared. Today he explores how AI reshapes programming, writes the 'mechanisms' newsletter on Substack, and continues speaking at conferences worldwide.