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Emanuele Longo

Emanuele Longo

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21h ago

Model Port in .NET C#: From vendor SDKs to a port for the language model (2026)

Imagine your e-commerce wants its first AI feature: a product description written from the supplier’s notes. Nobody wants to call the HTTP…

Cover of the AI in Software Architecture series: the title Model Port, with a socket in the middle and three different plugs approaching it, and the labels IChatClient, Adapters, Middleware, Business port, Testing and Best practices

In

Level Up Coding

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Emanuele Longo

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1d ago

Memento Pattern in .NET C#: From private snapshots to immutable records and versioned JSON (2026)

Imagine developing the back-office of an e-commerce, and in particular the editor of the product sheets: title, description, price, and…

Memento cover in the style of the Design Patterns series: MEMENTO in green, with the .NET and C# badges and the topics Evolution, Originator, Caretaker, Undo/Redo, Records, with, System.Text.Json, Schema versioning, Best practices

In

Level Up Coding

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Emanuele Longo

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1d ago

TimeProvider in .NET 8+: From DateTime.UtcNow to deterministic tests with FakeTimeProvider

Time is the one dependency every business application has and almost nobody injects. If you’ve ever written C# code for a shop, you’ve…

In

Level Up Coding

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Emanuele Longo

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1d ago

Observer Pattern in .NET C#: From Subject and Update to events and Reactive Extensions (2026)

Imagine developing an e-commerce site whose best-selling running shoes have just sold out. Customers click “Notify me when it’s back in…

Observer cover in the style of the Design Patterns series: OBSERVER in green, with the .NET and C# badges and the topics Evolution, Subject & Observer, Events, Weak events, IObservable, Reactive Extensions, Data binding, Best practices

Emanuele Longo

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2d ago

AI in Software Architecture in .NET C#: Where language models belong in your application (2026)

Imagine the e-commerce of the previous series: the order flow works, from the cart to the “Your order has been confirmed!” email. Now the…

Cover of the AI in Software Architecture series: a blueprint with the title Where the Model Belongs, a request passing through three boxes towards a dashed circle, and the labels Model Port, Gateway, Routing, Semantic Cache, RAG, Guardrails, Observability, Prompts and Multi-tenant

In

Level Up Coding

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Emanuele Longo

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3d ago

Frozen Collections and SearchValues in .NET

Lookup tables are one of the quiet pillars of every business application. If you’ve ever written C# code for a shop, you’ve found a product…

In

Level Up Coding

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Emanuele Longo

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3d ago

State Pattern in .NET C#: From scattered switches to exhaustive state machines (2026)

Imagine developing the order management of an e-commerce. An order is born Pending, becomes Paid, then Shipped and Delivered. It can be…

State cover in the style of the Design Patterns series: STATE in green, with the .NET and C# badges and the topics Evolution, Context, Concrete States, Transition table, Pattern matching, EF Core, Concurrency, Stateless, Best practices

In

Level Up Coding

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Emanuele Longo

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3d ago

Mediator Pattern in .NET C#: From dialog boxes to in-process request handlers (2026)

Imagine developing the checkout page of an e-commerce site. Four components share the screen: the cart with its quantities, a box for…

Mediator cover in the style of the Design Patterns series: MEDIATOR in green, with the .NET and C# badges and the topics Evolution, Colleagues, Blazor, Requests & Handlers, Pipeline behaviors, MediatR, Source generators, Best practices

Emanuele Longo

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3d ago

Choosing an Architecture in .NET C#: From fashion to a decision you can defend (2026)

Imagine you are starting the new version of your online shop on Monday morning. The team of four meets to decide the architecture, and the…

Cover of the Modern Software Architecture series: Choosing an Architecture, with one circle fanning out three lines on the left, three stacked boxes on the right, and the labels Forces, Trade-offs, Decision ladder, One style per module, Seams, ADR, Testing and Best practices

Emanuele Longo

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4d ago

Architecture Tests and ADRs in .NET

Imagine your shop is six months old and the team has doubled. The order feature works, the rules live in Shop.Core, and the project…

Cover of the Modern Software Architecture series: Architecture Tests and ADRs, with a box with a cross on the left, three stacked records on the right, and the labels Fitness functions, Nygard 2011, NetArchTest, ArchUnitNET, Dependency Rule, ADR log, Testing and Best practices

Emanuele Longo

Emanuele Longo

.NET Software Developer driven by clean architecture and purposeful design.

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