Interface-Driven Design for C# Trading Systems

A poorly architected c# trading bot becomes impossible to maintain after a few hundred lines. The key to a system you can extend and test is rigorous interface design combined with dependency injection.

The IExchangeClient Interface

public interface IExchangeClient\n{\n    Task<OrderResult> PlaceOrderAsync(Order order, CancellationToken ct);\n    Task<IEnumerable<Position>> GetPositionsAsync(CancellationToken ct);\n    IAsyncEnumerable<Tick> SubscribeTicksAsync(string symbol, CancellationToken ct);\n}

The Strategy Pattern

Define an ITradingStrategy interface with a GenerateSignal(MarketData data) method. Your execution engine only knows about this interface. This means you can swap from an SMA strategy to an ML-based strategy without changing a single line of execution code in your algorithmic trading with c# project.

Dependency Injection

Register your implementations in the .NET DI container. Your bot's entry point just requests the interfaces it needs. This makes testing trivial—inject mocks during tests and real implementations in production. It is the cornerstone of professional build trading bot with .net development.