Modern .NET Core framework, Onion Architecture, layered structure, clean code, dependency injection, abstraction, encapsulation, modular design, scalable system, microservices, APIs, databases, repositories, services, interfaces, entities, business logic, data access, presentation layer, application core, infrastructure, testing frameworks, C# code, Visual Studio, coding environment, futuristic neon lights, digital circuit boards, minimalist desk, ergonomic chair, developer workspace, morning sunlight, coffee cup.