TeamBuilder Architecture: API-First, Frontend-Agnostic, Azure SQL Ready

[RocketDelivery2]

TeamBuilder is being designed as an API-first full-stack platform.

The ASP.NET Core Web API is the middle layer between any client-side interface and the backend data platform.

Architecture direction

The current architecture direction is:

• any client frontend
• TeamBuilder ASP.NET Core Web API
• application services and domain logic
• EF Core Code First
• Azure SQL Server

Why API-first?

An API-first approach allows TeamBuilder to support many clients without locking the project into one frontend technology.

TeamBuilder should work with:

• React
• Angular
• Vue
• Blazor WebAssembly
• Android
• iOS
• desktop clients
• static HTML and JavaScript
• third-party applications
• future official TeamBuilder clients
• external roster systems

Backend technology direction

The backend direction is:

• C#
• ASP.NET Core Web API
• Entity Framework Core Code First
• Azure SQL Server
• clean architecture
• dependency injection
• DTO-based API contracts
• unit tests
• Swagger and OpenAPI
• environment-based configuration
• Octopus Deploy-ready configuration

Proposed solution structure

The project is moving toward a structure like:

• TeamBuilder.Api
• TeamBuilder.Application
• TeamBuilder.Domain
• TeamBuilder.Infrastructure
• TeamBuilder.Tests

Scalability goals

TeamBuilder should be designed for future large-scale worldwide use.

That means:

• stateless API design
• async database access
• pagination for list endpoints
• filtering and search
• DTO projections
• database indexes
• health checks
• structured logging
• safe CORS configuration
• no hardcoded secrets
• no frontend lock-in
• no unbounded API responses

Discussion topics

Use this thread to discuss:

• API boundaries
• endpoint naming
• DTO design
• domain model design
• EF Core modeling
• Azure SQL readiness
• client integration
• performance
• deployment architecture
• future authentication
• scaling to large user volume

If you have experience with .NET, APIs, Azure, SQL Server, distributed systems, frontend clients, mobile apps, DevOps, testing, or open-source architecture, your input is welcome.