Simon is an independent software development consultant specializing in software architecture; specifically technical leadership, communication, and lightweight, pragmatic approaches to software architecture. Simon is the author of "Software Architecture for Developers", a developer-friendly guide to software architecture, technical leadership, the balance with agility and communicating software architecture with sketches, diagrams, and models. He is also the creator of the C4 model and the founder of Structurizr, a collection of tooling to help teams visualise, document and explore their software architecture.