David Nguyen's Personal Blog

Event Modeling: When a Distinction Stops Being True

If a system sends three kinds of email, does it need three kinds of delivered? Why a distinction that is real when something is created is often not real later in its life, and what splitting it anyway costs you.

Jul 22, 2026 6 min

event-modeling architecture eda

Event Sourcing: External Systems and Commands

What Counts as a Command When You Call an External System

Jun 28, 2026 5 min

event-sourcing architecture eda

Event Sourcing: When to Centralise a Reactor

When to create a new reactor and when to extend an existing one

Jun 13, 2026 8 min

event-sourcing architecture eda

Testing interface contracts

Apr 26, 2026 6 min

programming unit-testing

Using CUE to Manage Build Pipelines at Scale

How to use CUE configuration language to manage build pipelines at scale and avoid YAML drift.

Mar 8, 2026 12 min

infrastructure deployment cue

Event Sourcing: Event Versioning

How to version events in event-sourced systems where events must remain compatible forever.

Mar 7, 2026 8 min

event-sourcing architecture eda

Building a Quality Pipeline for AI-Assisted Development

Experimental multi-agent workflow that turns a feature request into reviewed, tested, committed code

Mar 1, 2026 6 min

programming ai

Independent Verification in Tests

Different degrees of independence when writing tests

Feb 17, 2026 5 min

programming golang unit-testing

Event Sourcing: Aggregates

My thoughts on event sourcing aggregate design

Dec 3, 2025 6 min

event-sourcing architecture eda

Event Sourcing: Model External Interactions

My experience with modelling external interactions in an event-sourced system

Oct 28, 2025 8 min

event-sourcing architecture eda