KHALIL STEMMLER

Currently

Spinning "Virgo's Maze" by Part Time

Reading "Patterns of Enterprise Application Architecture" by Martin Fowler

My book on Node.js / TypeScript software design and architecture just pre-launched 📕 (%33 off)!

SOLID: The Software Design & Architecture Handbook

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Advanced TypeScript & Node.js best practices for large-scale applications. Learn to write flexible, maintainable software.

I create courses, books, and articles for aspiring developers on Enterprise Node.js, Domain-Driven Design and writing testable, flexible JavaScript.

recent articles

The 6 Most Common Types of Logic in Large Applications [with Examples]Software Design

Sep 16th, 2019 / 12 min read

In this article, you'll learn about the Clean Architecture, why we should separate the concerns of large applications into layers,...

by Khalil Stemmler

Why I Don't Use a DI Container | Node.js w/ TypeScript Software Design

Sep 16th, 2019 / 11 min read

ioc containers dependency injection inversion of control

Instead of a DI Container, I just package features by component and use logical naming conventions.

by Khalil Stemmler

Dependency Injection & Inversion Explained | Node.js w/ TypeScript Software Design

Sep 11th, 2019 / 10 min read

dependency injection dependency inversion inversion of control ioc containers

Dependency Injection and Depedency Inversion are two related but commonly misused terms in software development. In this article, ...

by Khalil Stemmler

Command Query Segregation | Object-Oriented Design Principles w/ TypeScript Software Design

Aug 29th, 2019 / 11 min read

command query segregation object-oriented programming

CQS (Command-Query Segregation) is a design principle that states that a method is either a COMMAND that performs an action OR a Q...

by Khalil Stemmler

How to Setup a TypeScript + Node.js Project TypeScript

Aug 29th, 2019 / 10 min read

guides typescript starters

In this guide, we walk through the process of creating a TypeScript project from scratch with cold-reloading, and scripts for buil...

by Khalil Stemmler

Functional Error Handling with Express.js and DDD | Enterprise Node.js + TypeScript Enterprise Node + TypeScript

Aug 14th, 2019 / 16 min read

node.js typescript functional programming ddd express.js enterprise software

How to expressively represent (database, validation and unexpected) errors as domain concepts using functional programming concept...

by Khalil Stemmler

An Introduction to Domain-Driven Design - DDD w/ TypeScript Domain-Driven Design

Jul 30th, 2019 / 12 min read

ddd typescript software design

Domain-Driven Design is the approach to software development which enables us to translate complex problem domains into rich, expr...

by Khalil Stemmler

Where Do Domain Events Get Created? | Domain Driven Design w/ TypeScript Domain-Driven Design

Jul 4th, 2019 / 5 min read

ddd domain entities software design

In this post, I explain how good ol' fashioned encapsulation + TypeScript getters and setters enable us to effectively create Doma...

by Khalil Stemmler

My book on Node.js / TypeScript software design and architecture just pre-launched 📕 (%33 off)!

SOLID: The Software Design & Architecture Handbook

Presale $24.99

recently edited wikis

The Dependency Rule

Updated Sep 17th, 2019 / 4 min read

solid architecture design principles

A software architecture rule that specifies the relationship between layers, namely that an inner layer should never rely on anything from an outer layer.

Stable Abstraction Principle (SAP)

Updated Sep 15th, 2019 / 1 min read

component principles

The more stable a component is, the more abstract it should be