Medium

Emanuele Longo

Emanuele Longo

·

1h ago

Microkernel (Plugin) Architecture in .NET

Imagine your e-commerce is open in one country, with one payment provider. Then marketing launches a new coupon every month, a second…

Cover of the Modern Software Architecture series: Microkernel, with a core box and three small boxes joined by lines on each side, and the labels POSA 1996, Core and plug-ins, Strategy, MEF, AssemblyLoadContext, Contracts, Isolation and Testing

Emanuele Longo

·

1d ago

Pipes and Filters in .NET C#: From Unix pipes to Channels and async streams (2026)

Imagine your e-commerce is doing well. Orders arrive from your own checkout, and now also from a marketplace that sends a file every night…

Cover of the Modern Software Architecture series: Pipes and Filters, with a row of circles joined by a line with arrows, and the labels Unix pipes, LINQ, Async streams, Channels, Backpressure, Middleware, Testing and Best practices

Emanuele Longo

·

2d ago

Event-Driven Architecture in .NET C#: From the Observer pattern to the transactional outbox (2026)

Imagine your e-commerce is growing. When an order is placed, the shop must reserve the stock, prepare the shipment, send the confirmation…

Cover of the Modern Software Architecture series: Event-Driven, with a circle on the left fanning out three lines and a dashed circle on the right where three lines converge, and the labels Events vs commands, In-process, Channels, Message broker, Outbox, Idempotency, Testing and Best practices

In

Level Up Coding

by

Emanuele Longo

·

2d ago

Behavioral Patterns in .NET C#: Coordinating objects and responsibilities in modern applications

Creating objects and connecting them is only half of the story. Once an application is running, its objects have to collaborate: decide who…

Behavioral Patterns cover in the style of the Design Patterns series: BEHAVIORAL PATTERNS in green, with the .NET and C# badges and the topics Strategy, Observer, Command, Iterator, Chain of Responsibility, State, Visitor, Mediator, Delegates, Async

In

Level Up Coding

by

Emanuele Longo

·

2d ago

Extension Object Pattern in .NET C#: From GetExtension to feature collections (2026)

Imagine developing the order module of an e-commerce site. The Order class lives in the core of the system, and checkout, warehouse and…

Extension Object cover in the style of the Design Patterns series: EXTENSION OBJECT in green, with the .NET and C# badges and the topics Evolution, GetExtension, QueryInterface, Feature collections, IChatClient, ConditionalWeakTable, Extension members, Best practices

In

Level Up Coding

by

Emanuele Longo

·

2d ago

Nullable Reference Types and Null-Conditional Assignment in C# 14: From NullReferenceException to…

Null is one of the oldest companions of every C# developer. If you’ve ever written C# code, you’ve met it, usually in a stack trace and at…

Emanuele Longo

·

3d ago

Event Sourcing in .NET C#: From the accountant’s ledger to an event store (2026)

Imagine your e-commerce is online, and support writes to you about one order. Why was the total 36 and not 40? When was the coupon applied…

Cover of the Modern Software Architecture series: Event Sourcing, with a row of boxes on each side of a dashed line in the background and the labels Fowler 2005, Event store, Append-only, Rebuild state, Projections, Snapshots, Testing and Best practices

Emanuele Longo

·

4d ago

CQRS in .NET C#: From Meyer’s rule to separate read models (2026)

Imagine your e-commerce has been online for a while. The Order aggregate of the Domain Logic article is a good one: it guards the stock…

Cover of the Modern Software Architecture series: CQRS, with two pairs of boxes on each side of a dashed line in the background and the labels Meyer CQS, Greg Young, Commands, Queries, Read models, Projections, Testing and Best practices

In

Level Up Coding

by

Emanuele Longo

·

5d ago

Mixin Pattern in .NET C#: From Lisp flavors to extension members and source generators (2026)

Imagine developing the back office of an e-commerce site. Products, orders, coupons and assistance plans share some capabilities, but not…

Mixin cover in the style of the Design Patterns series: MIXIN in green, with the .NET and C# badges and the topics Evolution, Extension methods, Default interface methods, Diamond problem, Extension members, Static abstract, Source generators, Composition, Best practices

In

Level Up Coding

by

Emanuele Longo

·

5d ago

Module Pattern in .NET C#: From information hiding to modular monoliths (2026)

Imagine joining the team of an e-commerce site that has been growing for five years. There’s one web project, one ShopDbContext with eighty…

Module cover in the style of the Design Patterns series: MODULE in green, with the .NET and C# badges and the topics Evolution, Information hiding, internal, InternalsVisibleTo, Module initializers, Feature modules, Architecture tests, Best practices

Emanuele Longo

Emanuele Longo

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

Following

Help

Status

About

Careers

Press

Blog

Store

Privacy

Rules

Terms

Text to speech