Explore a live coding demonstration that showcases the application of Test-Driven Development (TDD) and Domain-Driven Design (DDD) principles from project inception. Learn how to start with a simple CRUD system for university student enrollments and progressively incorporate more complex requirements. Witness the evolution of the codebase as it transforms to handle course enrollment limits, prompting refactoring that introduces DDD tactical patterns such as repositories, aggregates, and domain services. Discover how this approach enhances maintainability and flexibility, allowing for significant model changes like shifting to a resource allocation system based on course popularity. Experience firsthand how TDD and DDD techniques can be applied to projects of varying complexity, with the programming language chosen by audience vote between C# and Java.