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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I'm Khalil. I teach advanced TypeScript & Node.js best practices for large-scale applications. Learn to write testable, flexible, and maintainable software.


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


Recent Articles

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How to Test Code Coupled to APIs or Databases
In the real-world, there's more to test than pure functions and React components. We have entire bodies of code that rely on datab...
How to Mock without Providing an Implementation in TypeScript
Having to provide an implementation everytime you create a test double leads to brittle tests. In this post, we learn how to creat...
When to Use Mocks: Use Case Tests
Mocking gets a pretty bad rap. However, if you're building an application using object-oriented programming and you're making use ...
Why I Recommend a Feature-Driven Approach to Software Design
Features represent the essential complexity of software design. It's the complexity that can't be avoided. Everything else — the l...
Introduction to Test-Driven Development (TDD) with Classic TDD Example
The best thing tests give us is "feedback". Feedback as to if our designs are good, if there are bugs, and if we're making progres...
GraphQL Schemas vs. RESTful DTOs
GraphQL schemas serve a similar purpose to RESTful DTOs. One of the main differences is tooling. In this post, I aim to strengthen...
Enforcing Coding Conventions with Husky Pre-commit Hooks
In this guide, we'll learn how to setup Husky to prevent bad git commits and enforce code standards in your project.
Domain-Driven GraphQL Schema Design | Enterprise GraphQL
A GraphQL schema is a declarative, self-documenting, organization-wide API. It's pretty important to spend a little bit of time on...
How Apollo REST Data Source Deduplicates and Caches API calls [Deep Dive]
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...
How to Setup a TypeScript + Node.js Project
In this guide, we walk through the process of creating a TypeScript project from scratch with cold-reloading, and scripts for buil...
Where Do Domain Events Get Created? | Domain Driven Design w/ TypeScript
In this post, I explain how good ol' fashioned encapsulation + TypeScript getters and setters enable us to effectively create Doma...

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

SOLID: The Software Design & Architecture Handbook

Presale $29.99



Recent Blogs

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Existential State Machines
May 24th, 2021

Originally published in volvox vault's issue on metamorphosis. Someone said I was a writer the other day. When the hell did that happen…

What Would Albert Camus Think About Software Development?
Apr 26th, 2021

Albert Camus was a French philosopher most well known for his ideas about absurdism. Sometimes regarded as an existentialist philosopher…

Transcribing Video With DDD Discussion | Domain Driven Design w/ TypeScript
Feb 22nd, 2021

I'm always interested in what blog readers are building using Domain-Driven Design and Clean Architecture practices. In this post, I'd like…

5 Ways to Manage Lambda Cold Starts
Jun 27th, 2020

In this article, you will learn how cold start issues occur, what factors contribute to cold starts, and how to manage Lambda cold starts…



Recently Edited Wikis

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Coupling, Cohesion & Connascence
Last updated Sep 8th, 2021
The foundational measurements of structural software quality
Test Doubles
Last updated Sep 7th, 2021
A test double is a generic term to refer to any object that stands in for a production one during testing