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Claude Code for .NET Developers

Definitive Guide

Michel Banagouro

A production-tested guide for senior .NET developers, tech leads, and architects who want real AI productivity gains - not another tutorial that breaks down the moment you leave the demo.

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About

About

About the Book

Most .NET Developers Are Using AI Wrong.

You've tried GitHub Copilot. Maybe Cursor. Probably ChatGPT.

And you've seen the pattern:

  • Works great for autocomplete.
  • Falls apart when your codebase has 200 files, real business rules, and architectural constraints that matter.

That's because most AI coding tools are designed for demos.
Claude Code is built differently. And most .NET developers haven't figured out how to use it correctly yet.

The problem isn't the AI. It's the workflow.

Without the right setup, Claude Code gives you:

  • Code that doesn't compile because it doesn't understand your project structure
  • Suggestions that ignore your existing patterns
  • Refactors that break things three layers away
  • A false sense of speed that turns into a debugging marathon

And the tutorials that exist? They're either too shallow ("just ask Claude to write your controller") or written for JavaScript developers who've never touched Entity Framework.

Claude Code for .NET Developers is a production-tested manual.

Not a course. Not a YouTube tutorial. A manual - the kind you reference while you work.

Written by Michel Banagouro, CTO with 20+ years of production .NET, React, and Azure. This is the guide built from real shipping experience, not conference demos.

No fluff. No toy examples. Just what works.

After reading this book, you will:

  • Set up Claude Code to actually understand your .NET codebase - structure, patterns, existing conventions
  • Use it for Entity Framework Core migrations without hallucinations
  • Build full-stack features (C# API + React/TypeScript) with AI that makes the right calls
  • Write and review tests the way senior engineers do - not just "generate tests and pray"
  • Integrate Claude Code into your Azure DevOps CI/CD pipeline without breaking your build
  • Build custom MCP Servers to extend Claude Code for your specific workflow
  • Cut time on boilerplate in half - without introducing new bugs

The book covers the complete Claude Code workflow - from installation through advanced usage:

Foundations

How Claude Code works and why it's fundamentally different from chat-based AI tools

Prompt Engineering for .NET

The patterns that work in real codebases - not just isolated files

Requirements & Prototyping

Use Claude Code from the start of a feature, not just the end

Architecture & Design

Let AI help you think through decisions, not just generate code

Backend Development

APIs, Entity Framework Core, business logic that holds up in production

Frontend Development

React/TypeScript — integrated with your .NET backend the way it works in the real world

Testing & Code Review

Real testing strategies, not test generation theater

CI/CD with Azure DevOps

Automation that actually ships

Infrastructure & Observability

Production-grade setup, not tutorial-grade

MCP Servers

The advanced capability most developers don't know exists - and the one that makes Claude Code genuinely powerful

This book is for you if:

  • You're a senior .NET developer, tech lead, or software architect
  • You've tried AI coding tools and found them disappointing on real projects
  • You read O'Reilly and Manning - you expect depth, not surface-level content
  • You want to actually ship faster, not just feel like you're moving faster

This book is not for you if:

  • You're looking for a beginner's guide to C#
  • You want theory about how large language models work
  • You need basic programming concepts explained

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Author

About the Author

Michel Banagouro

Michel Banagouro is the CTO and partner at Leanwork Group, a software company delivering enterprise .NET solutions. Has more than 20 years of experience with .NET, React, and Azure, leading outsourcing squads, large-scale e-commerce platforms, and SaaS products. Currently driving Leanwork's repositioning as an AI-first company, building teams proficient in Claude Code and producing technical content on AI applied to software development.

Contents

Table of Contents

Notices and Disclaimer

  1. AI-generated code disclaimer
  2. Trademarks and brand attribution
  3. Library licensing — verify before adopting in commercial software

What Claude Code Is and Why It Changes Everything

  1. What this chapter does for you
  2. 1.1 What Is Claude Code
  3. 1.2 Claude Code vs. Claude Chat vs. the API
  4. 1.3 Why Claude Code Changes Everything
  5. 1.4 Installation and Setup
  6. 1.5 Where to Use Claude Code
  7. 1.6 Essential Commands
  8. 1.7 The CLAUDE.md File: Your Project’s Memory
  9. 1.8 Hands-On Exercise: Your First Project with Claude Code
  10. 1.9 Chapter Summary

The Mental Model: Prompt Engineering for .NET Developers

  1. What this chapter does for you
  2. 2.1 Why Prompt Engineering Matters for .NET Developers
  3. 2.2 The Anatomy of a Good .NET Prompt
  4. 2.3 Bad Prompts vs. Production Prompts
  5. 2.4 Advanced Prompt Engineering Techniques
  6. 2.5 Context Management: What Separates Pros from Amateurs
  7. 2.6 Anti-Patterns: What NOT to Do
  8. 2.7 Prompt Templates for .NET Day-to-Day
  9. 2.8 Hands-On Exercise: Your First Feature with Production Prompts
  10. 2.9 Chapter Summary

Requirements Gathering with Claude Code

  1. What this chapter does for you
  2. 3.1 The PO and AI: a Powerful Partnership
  3. 3.2 From Vague Idea to Structured Requirements
  4. 3.3 Generating Professional User Stories
  5. 3.4 Technique: Finding Gaps in the Specification
  6. 3.5 Prioritizing the Backlog
  7. 3.6 Generating the PRD (Product Requirements Document)
  8. 3.7 Advanced Techniques for the PO
  9. 3.8 Hands-On Exercise: TaskManager Full Backlog
  10. 3.9 Chapter Summary

Rapid Prototyping and Validation

  1. What this chapter does for you
  2. 4.1 Why Prototype Before You Build
  3. 4.2 Prototyping Fidelity Levels with Claude Code
  4. 4.3 Level 1: Descriptive Wireframes
  5. 4.4 Level 2: Static HTML Prototypes
  6. 4.5 Level 3: Interactive React Prototypes
  7. 4.6 Navigation Flows
  8. 4.7 Spec Review: Claude Code as Your Relentless Critic
  9. 4.8 Stakeholder Validation
  10. 4.9 Custom Commands for the PO
  11. 4.10 Hands-On Exercise: TaskManager Prototypes
  12. 4.11 Chapter Summary

Defining Architecture with Claude Code

  1. What this chapter does for you
  2. 5.1 The Architect and AI: Better Decisions, Faster
  3. 5.2 Evaluating Architectural Styles
  4. 5.3 Architecture Decision Records (ADRs)
  5. 5.4 The Complete Technical Stack
  6. 5.5 C4 Diagrams with Claude Code
  7. 5.6 Modular Monolith Structure
  8. 5.7 Cross-Cutting Concerns
  9. 5.8 Architecture Validation
  10. 5.9 Hands-On Exercise: Full TaskManager Architecture
  11. 5.10 Chapter Summary

Project Structure and Code Patterns

  1. What this chapter does for you
  2. 6.1 The Definitive CLAUDE.md
  3. 6.2 The Project’s Core Patterns
  4. 6.3 Automated Scaffolding with Claude Code
  5. 6.4 Detailed Naming Conventions
  6. 6.5 Global Usings and Project Configuration
  7. 6.6 Module Registration in Program.cs
  8. 6.7 Test Patterns
  9. 6.8 Hands-On Exercise: Full TaskManager Setup
  10. 6.9 Chapter Summary

Feature-by-Feature Development

  1. What this chapter does for you
  2. 7.1 The Explore → Plan → Code → Commit Flow
  3. 7.2 Implementing US-001: Create Task
  4. 7.3 Implementing US-002: List and Filter Tasks
  5. 7.4 Implementing US-003 through US-005
  6. 7.5 Working with Multiple Files
  7. 7.6 Progressive Iteration and Refinement
  8. 7.7 Session Management During Development
  9. 7.8 Custom Commands for the Developer
  10. 7.9 Hands-On Exercise: Implement US-001 through US-005
  11. 7.10 Chapter Summary

Backend: APIs, Databases, and Integrations

  1. What this chapter does for you
  2. 8.1 Authentication and Authorization
  3. 8.2 Migrating to Azure SQL
  4. 8.3 Messaging with Azure Service Bus
  5. 8.4 HttpClientFactory and External Integrations
  6. 8.5 Rate Limiting and API Protections
  7. 8.6 Caching with Redis
  8. 8.7 API Versioning and OpenAPI
  9. 8.8 Configuration and Secrets
  10. 8.9 Practical Exercise: Full TaskManager Backend
  11. 8.10 Chapter Summary

Frontend: Interfaces That Work

  1. What this chapter does for you
  2. 9.1 React Project Setup
  3. 9.2 TypeScript Types from the API
  4. 9.3 Axios with JWT Authentication
  5. 9.4 TanStack Query: Server State
  6. 9.5 Layout and Base Components
  7. 9.6 Frontend Authentication
  8. 9.7 Kanban Board with Drag and Drop
  9. 9.8 Forms and Validation
  10. 9.9 Error Handling and Loading States
  11. 9.10 Hands-On Exercise: Full TaskManager Frontend
  12. 9.11 Chapter Summary

Refactoring and Code Review with AI

  1. What this chapter does for you
  2. 10.1 Code Review with Claude Code: The Systematic Approach
  3. 10.2 Applying Fixes Systematically
  4. 10.3 Guided Refactoring: .NET Code Smells
  5. 10.4 Legacy Code Migration
  6. 10.5 Frontend Review
  7. 10.6 When NOT to Use AI for Refactoring
  8. 10.7 Custom Commands for Review and Refactoring
  9. 10.8 Hands-On Exercise: TaskManager Review and Refactoring
  10. 10.9 Chapter Summary

Testing Strategy with Claude Code

  1. What this chapter does for you
  2. 11.1 The TaskManager Test Pyramid
  3. 11.2 Unit Tests with Claude Code
  4. 11.3 Integration Tests with WebApplicationFactory
  5. 11.4 Testcontainers: Real Database in Tests
  6. 11.5 AI-Assisted TDD
  7. 11.6 Finding Coverage Gaps
  8. 11.7 Mocks, Fixtures, and Test Data Builders
  9. 11.8 Hands-On Exercise: Complete Test Suite
  10. 11.9 Chapter Summary

Quality Beyond Testing

  1. What this chapter does for you
  2. 12.1 Static Analysis with .NET Analyzers
  3. 12.2 Technical API Documentation
  4. 12.3 OWASP Security Audit
  5. 12.4 Load Testing with k6
  6. 12.5 Code Coverage with Coverlet
  7. 12.6 The Definitive Pre-Release Checklist
  8. 12.7 Hands-On Exercise: Full Quality Pass on TaskManager
  9. 12.8 Chapter Summary

CI/CD with Claude Code and Azure DevOps

  1. What this chapter does for you
  2. 13.1 Optimized Multi-Stage Dockerfile
  3. 13.2 CI/CD Pipeline with Azure DevOps
  4. 13.3 Environments and Per-Environment Configuration
  5. 13.4 Azure Container Registry and Images
  6. 13.5 Deploy to Azure Container Apps
  7. 13.6 Migrations in CI/CD
  8. 13.7 Alternative Pipeline: GitHub Actions
  9. 13.8 Custom Commands for DevOps
  10. 13.9 Hands-On Exercise: Full TaskManager Pipeline
  11. 13.10 Chapter Summary

Infrastructure and Observability

  1. What this chapter does for you
  2. 14.1 The Three Pillars of Observability
  3. 14.2 Structured Logging with Serilog
  4. 14.3 OpenTelemetry: Metrics and Tracing
  5. 14.4 Application Insights and Dashboards
  6. 14.5 Automated Alerts
  7. 14.6 Complete Infrastructure with Bicep
  8. 14.7 Troubleshooting with Claude Code
  9. 14.8 Hands-On Exercise: Full Observability Pass
  10. 14.9 Chapter Summary

Orchestrating the Full Cycle

  1. What this chapter does for you
  2. 15.1 The end-to-end cycle: from idea to deploy
  3. 15.2 CLAUDE.md as institutional memory
  4. 15.3 Parallel team: everyone with their own Claude Code
  5. 15.4 Productivity metrics: before and after
  6. 15.5 The complete custom command catalog
  7. 15.6 Gradual adoption: how to roll it out
  8. 15.7 Hands-on: Full end-to-end sprint
  9. 15.8 Chapter Summary

Advanced Patterns and the Future

  1. What this chapter does for you
  2. 16.1 MCP Servers: extending Claude Code
  3. 16.2 Claude Code CLI automations
  4. 16.3 Custom .NET CLI tools
  5. 16.4 When NOT to use AI
  6. 16.5 The future of .NET development with AI
  7. 16.6 Final words
  8. 16.7 Chapter Summary

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