Bob’s Used Books: Build a .NET Serverless Application on AWS – Part 3: Infrastructure as Code and Development Patterns

This article demonstrates building maintainable .NET serverless applications using AWS CDK, Lambda Annotations Framework, and Lambda Powertools through the Bob's Used Books example application.

• AWS CDK enables infrastructure definition in C# with type safety and IntelliSense support
• Separate authentication and business logic stacks enable independent deployment and reduce conflicts
• Shared constructs pattern promotes consistency and eliminates infrastructure code duplication
• Fluent API interface simplifies API Gateway endpoint configuration with method chaining
• Developer-specific postfix pattern creates isolated environments without complex tooling
• Parameter Store enables loose coupling between stacks with dynamic resource names
• Lambda Annotations Framework reduces boilerplate with declarative attributes for HTTP mapping
• Lambda Powertools provides structured logging, metrics, and tracing without manual setup
• Cognito and Verified Permissions integrate for authentication and fine-grained authorization
• Cedar policy language enables human-readable, auditable authorization rules

These patterns address serverless development challenges including infrastructure complexity, environment isolation, and observability, providing a production-ready foundation for .NET serverless applications.