Khalil Stemmler | Advanced TypeScript & Node.js best practices for large-scale applications

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

Why I Recommend a Feature-Driven Approach to Software Design 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 Test-Driven Development

tdd test-driven development software craftsmanship agile technical practice classic tdd

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

graphql architecture software design restful apis dto

GraphQL schemas serve a similar purpose to RESTful DTOs. One of the main differences is tooling. In this post, I aim to strengthen...

Use DTOs to Enforce a Layer of Indirection | Node.js w/ TypeScript Enterprise Node + TypeScript

node.js typescript express.js enterprise software dto

DTOs help you create a more stable RESTful API; they protect your API clients from changes made on the server.

Maintain a Single Layer of Abstraction at a Time | Object-Oriented Design Principles w/ TypeScript Design Principles

leaky abstraction abstraction layer object-oriented programming

The more complex your system gets, the more we need to lean on the correct abstractions to keep things maintainable. This principl...

Client-Side Architecture Basics [Guide]Client-Side Architecture

architecture frontend development model-view-presenter observer pattern react software design

Though the tools we use to build client-side web apps have changed substantially over the years, the fundamental principles behind...

Enforcing Coding Conventions with Husky Pre-commit Hooks Tooling

guides typescript prettier formatting

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 GraphQL

domain-driven design professionalism project planning

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]GraphQL

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...

How to Setup a TypeScript + Node.js Project TypeScript

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...

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

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...

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

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

Coupling, Cohesion & Connascence

Last updated Feb 9th, 2021

object-oriented design software design

The foundational measurements of structural software quality

Leaky Abstraction

Last updated Feb 9th, 2021

object-oriented design code smells

An abstraction that leaks details that it is supposed to abstract away