Lately, things are getting confusing. There’s .NET Framework, there’s .NET Core, and there’s .NET. They’re all pretty much the same, but they are very much different. It all began with the .NET Framework in 2002. In the past twenty years software changed our society. Individuals and businesses rely on software…

CQRS is an abbreviation for Command and Query Responsibility Segregation. It means every single endpoint of an application either executes a command or retrieves data. Never both. Many people refer to Greg Young when they talk about CQRS. He published this pdf which describes the concepts in depth. Greg Young…

In 2017 Uncle Bob wrote a great book about clean architecture. It explains the principles of a good software architecture. The book contains lots of information about the SOLID principles, about boundaries in the application, about screaming architecture, and so forth. What’s great about the book, is that it isn’t…

Estimating a story in hours is common practice. But often, estimations in hours prove not to be accurate. How much time it takes to complete a task depends on a lot of variables. There’s a better way. …

Applications automate processes. Somebody explains the process and someone else builds the application. Seems straight forward, right? Or is it? Perhaps this video changes your mind: Describing a task as simple as making a sandwich seems simple, but as you can see, plenty of things that can go wrong…

Canary-releasing or zero-downtime/blue-green deployments are made easy by the tools and techniques we have today. Running a second instance of a service is a piece of cake. Especially in the cloud. But aren’t we forgetting something? Canary-releasing and blue-green deployments have something in common: They require two versions of the…

Domain-Driven Design, that’s what you use when you’re building Microservices. It’s a technique that can be used to cut monoliths into small bits, and it’s about Aggregates and Event-Sourcing. Or is it? The book Domain-Driven Design by Eric Evans first appeared in 2004. It’s a book about communication, language, context…

An application that has a dependency on a SQL database needs to connect to an instance of a database that has a compatible schema. Otherwise, the application breaks. Changing the database means lots of work. Not to mention the risk associated with changing the schema itself. Plenty of reason not…