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

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

Aug 14th, 2019 / 14 min read

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

Handling Collections in Aggregates (0-to-Many, Many-to-Many) - Domain-Driven Design w/ TypeScript Domain-Driven Design

Jul 25th, 2019 / 10 min read

ddd typescript software design aggregate one-to-many many-to-many

In this article, we discuss how we can use a few CQS principles to handle unbounded 0-to-many or many-to-many collections in aggre...

by Khalil Stemmler

Challenges in Aggregate Design #1 - Domain-Driven Design w/ TypeScript Domain-Driven Design

Jul 25th, 2019 / 5 min read

ddd typescript software design aggregate

In this series, we answer common questions in aggregate design. Here's an article orignating from the question, "How can a domain ...

by Khalil Stemmler

How to Design & Persist Aggregates - Domain-Driven Design w/ TypeScript Domain-Driven Design

Jul 24th, 2019 / 28 min read

ddd typescript software design aggregate root aggregate sequelize

In this article, you'll learn how identify the aggregate root and encapsulate a boundary around related entities. You'll also lear...

by Khalil Stemmler

There Is No Dominant Paradigm | Software Professionalism Software Professionalism

Jul 11th, 2019 / 9 min read

node.js software design javascript

Functional programming is not the end to all of our problems. Quality software is all three paradigms.

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 Jul 30th, 2019 / 1 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.

Conway's Law

Updated Jul 3rd, 2019 / 3 min read

architecture software design software architecture

Any organization that designs a system (defined more broadly here than just information systems) will inevitably produce a design whose structure is a copy of the organization's communication structure.