Learn how to refactor an existing e-commerce codebase with the help of GitHub Copilot. In this video, we’ll walk through a FastAPI + Cosmos DB inventory project, identify code smells, and craft effective Copilot instructions to guide the refactor. You’ll see how to build prompts, run them with Agent Mode, and review the generated code step by step. Finally, we’ll wrap up with key best practices to make AI-assisted refactoring faster, cleaner, and more reliable.

🔎 Chapters:
00:00 Intro
00:36 Getting Started
02:25 Choosing our directory - product_crud_batch.py
03:50 Custom Instructions
05:25 Creating our prompt
09:58 Running our prompt with agent mode
19:11 Testing Changes
23:39 In Summary
24:14 Wrap

🔗 Link:
Repo: https://github.com/madebygps/cosmosdb-fastapi-functions

🎙️ Featuring: Gwyneth Peña-Siguenza (@madebygps)

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A practical demonstration of using GitHub Copilot and prompt-driven development to refactor an existing Python inventory API. The tutorial shows how to separate business logic from database operations by moving code from CRUD layers to service layers, using structured prompts and copilot instructions to guide the AI through the refactoring process. The example includes setting up copilot instructions, creating prompt files, and validating the refactored code through manual testing.

Refactor an Existing Codebase using Prompt Driven Development