Building an e-commerce site is common, but building an Enterprise-Grade E-Commerce Framework requires a 12-year architect's mindset. We will build a scalable, secure, and high-performance system from scratch.
We are not building a simple monolith. We are building a modular monolith that can easily transition to microservices in the future.
Entities: Product, Category, Brand, Specification. Using EF Core Fluent API for precise mapping.
Entities: Order, OrderItem, ShippingAddress, PaymentStatus. Implementing **Optimistic Concurrency** via RowVersion for inventory management.
When a user hits "Place Order", the system must perform a Distributed Transaction (if using microservices) or a Unit of Work (in our case).
// Expert Implementation: Placing the Order using Unit of Work
public async Task PlaceOrder(OrderRequest request) {
using (var transaction = await _unitOfWork.BeginTransactionAsync()) {
try {
// Check inventory (using RowVersion to avoid over-selling)
var product = await _unitOfWork.Products.GetByIdAsync(request.ProductId);
if (product.Stock < request.Quantity) throw new InsufficientStockException();
// Create Order
var order = new Order { ... };
_unitOfWork.Orders.Add(order);
// Commit!
await _unitOfWork.SaveChangesAsync();
await transaction.CommitAsync();
return order.Id;
} catch (Exception) {
await transaction.RollbackAsync(); // Atomic!
throw;
}
}
}
An architect's job is to ensure the app stays up during a "Black Friday" sale.
Never store raw Credit Card numbers. Always use Tokenization. Implement Idempotency Keys in your API to ensure that if a user clicks "Buy" twice due to a slow connection, they are only charged once. This is the difference between a Junior and a 12-year Architect.