Blog

Mert Özen's blog posts on software development, backend, frontend, and DevOps.

Series

.NET Core Web API 36 Angular 31 JavaScript Basics 19 JavaScript Intermediate 18 JavaScript Advanced 16 TypeScript Basics 14 TypeScript Intermediate 14 TypeScript Advanced 12 Entity Framework Core 28 Dapper 16 Git & GitHub 29 Web Security (OWASP Top 10) 21 LLM Fundamentals 20 C# Fundamentals 20 Object-Oriented Programming in C# 16 C# Collections and Generics 11 LINQ 17 Asynchronous Programming in C# 17 Advanced C# 14 C# Versions 6 Solution Patterns 22 SOLID and Design Principles 12 Clean Code 13 Design Patterns 23 UML and Modeling 18 Introduction to Software Architecture 9 Clean, Onion and Hexagonal Architecture 8 Vertical Slice Architecture 6 Domain-Driven Design 12 CQRS and Event Sourcing 10 Messaging and Event-Driven Architecture 9 Microservices 10

14 posts found #ddd

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Software Architecture PART 02

Ubiquitous Language: Code That Speaks the Domain Expert's Language

Ubiquitous language is the one precise language that domain experts and developers speak inside a bounded context and that maps directly to class and method names: order.Cancel(reason) and RequestReturn instead of Status = 4. Separating ambiguous words (product, status, return versus refund), a glossary with a translation column for a team that speaks Turkish and writes English code, a reflection-based glossary check, and how HttpStatusCode followed RFC 9110's renaming.

7 Nov 2026 12 min 6

Software Architecture PART 01

What Is Domain-Driven Design? When It Pays Off and When It Doesn't

DDD accepts that complexity lives in the business rules rather than the technology and brings the model into code together with domain experts; it pays off in a core domain whose rules change often and is unnecessary for CRUD screens and short-lived MVPs. A campaign discount bug that shows the difference between a CRUD model and a domain model, strategic versus tactical design, eShop's Ordering.Domain, and the series roadmap.

7 Nov 2026 12 min 6