Sandi Metz

"Practical Object-Oriented Design in Ruby"

Sandi Metz is a programmer, author, and trainer who teaches object-oriented design through her consultancy. She wrote 'Practical Object-Oriented Design in Ruby' (POODR) and co-authored '99 Bottles of OOP', both widely used in software curricula. Her work distils decades of programming experience into actionable design rules, most famously the 'Sandi Metz Rules' for class and method size.