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

Presale $24.99

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

Why Event-Based Systems? | Enterprise Node.js + TypeScript Enterprise Node + TypeScript

Dec 27th, 2019 / 3 min read

There are so many reasons why event-based systems are the standard for large-scale enterprise applications like GitHub, Facebook, ...

by Khalil Stemmler

How Apollo REST Data Source Deduplicates and Caches API calls [Deep Dive]GraphQL

Dec 14th, 2019 / 10 min read

apollo server graphql

Apollo's REST Data Source does a lot more than you'd think behind the scenes, and that's why it's recommended instead of using a w...

by Khalil Stemmler

Books that Junior Developers Should Read in 2020 [List]Software Professionalism

Nov 22nd, 2019 / 12 min read

software design javascript books

These books “are basically cheat codes” for leveling up your skills and knowledge as a developer.

by Khalil Stemmler

Make Illegal States Unrepresentable! - Domain-Driven Design w/ TypeScript Domain-Driven Design

Nov 21st, 2019 / 14 min read

ddd typescript functional programming

By using TypeScript's static type system, not only can we enforce (typically challenging things like) business rules and error sta...

by Khalil Stemmler

I'm Learning Everything GraphQL in 2020 GraphQL

Nov 19th, 2019 / 5 min read

gatsbyjs seo

GraphQL is the latest API style on the block. It's a modern way for us to pull data out of your system (queries) and make changes ...

by Khalil Stemmler

How to Handle Updates on Aggregates - Domain-Driven Design w/ TypeScript Domain-Driven Design

Nov 18th, 2019 / 20 min read

ddd typescript software design aggregate root aggregate sequelize

In this article, you'll learn approaches for handling aggregates on Aggregates in Domain-Driven Design.

by Khalil Stemmler

Comparison of Domain-Driven Design and Clean Architecture Concepts Software Design

Nov 5th, 2019 / 8 min read

domain-driven design clean architecture

Eric Evans' "Domain-Driven Design" and Uncle Bob's "Clean Architecture" are books that have introduced tactical approaches towards...

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

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 domain events

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

recent blogs

Decade in Review | 2010-2020

Jan 2nd, 2020 / 23 min read

At the time of writing this, I've been on Earth for about ~2.4 decades. That means that ten years ago, I was the very tender age of fourteen…

How Apollo REST Data Source Deduplicates and Caches API calls [Deep Dive]

Dec 14th, 2019 / 10 min read

Quite honestly, I don't know if I really enjoy writing optimization code. I'm not saying that I don't like optimized code- I'm saying that…

Static Factory Methods | Object-Oriented Programming w/ TypeScript

Nov 21st, 2019 / 1 min read

Go read "When to Use a Private Constructor | Object-Oriented Programming w/ TypeScript". You'll use static factory methods for the same…

When to Use a Private Constructor | TypeScript OOP

Nov 21st, 2019 / 3 min read

One of the first things we learn when we start out is how to create instances of objects. Typically, we do this with the keyword. The…

recently edited wikis

Monolithic Application

Updated Dec 2nd, 2019 / 2 min read

architecture deployments software architecture

An application where all the essential components are self-contained and deployed within a single process.

Anemic Domain Model

Updated Sep 24th, 2019 / 6 min read

domain-driven design

When the classes that describe the model and the classes that perform operations on the model are separate. The services contain all the domain logic while the the domain objects themselves contain practically none.