There are a number of aspects of team management that can change significantly as the team grows: people management, organization structure, communication, hiring, and culture. This book describes the critical inflection points in each area, and provides specific guidance on how to navigate these areas and ensure that teams remain effective and successful as they grow.
Scaling Teams is ideal for engineering managers who are building engineering teams/departments, from roughly 5 to 150 engineers. Although the emphasis is on organizations that span more than one team, (first time) managers who lead one team should find value in this book.