Mario Casciaro is a software architect, technology leader, and entrepreneur with a long career in building and scaling software products for mission-critical industries. Throughout his career, he has held roles ranging from software engineer to team leader to CTO. His passion for software and technology has led him to develop multiple side projects, launch a startup, and, of course, write the bestselling book Node.js Design Patterns. His proudest moment was seeing his software being used for astronaut rescue operations.