The Growing System: Design Patterns, SOLID, and System Design in Modern .NET

he Growing System takes you through the evolution of Cadence, a fictional appointment-booking platform. Through real-world requirements and forced architectural decisions, you will learn to navigate the complexities of:

• SOLID principles and design patterns.

• Modern .NET 10 and C# 14 best practices.

• Clean Architecture, CQRS, and Domain-Driven Design.

• System design fundamentals, including caching, scaling, and the CAP theorem.

• Critical production concerns: microservices, observability, security, and resilience.

By building one system from a messy controller to a scalable, testable architecture, you will gain the practical tools needed to design software that grows with your business.