TAG: ddd

Designing with Types: Conclusion

A before-and-after look at the Contact model, what its types now prevent, and where type-driven design is worth the extra code.

Geometric concrete arches beneath a patterned ceiling

Aug 26, 2026

Designing with Types: Non-String Types

How to constrain numbers, timestamps, and units with Effect so arithmetic and date parsing cannot quietly violate domain rules.

Aug 23, 2026

Designing with Types: Constrained Strings

How to use Effect Schema to normalize and constrain strings when they enter the domain, so formatting and length rules travel with the type.

Row of green industrial machines with control levers in different positions

Aug 15, 2026

Designing with Types: Making state explicit

How to model lifecycle rules as tagged states and events with Effect, making every transition and failure explicit.

Pixel art illustration representing AI-generated code quality problems

Feb 12, 2026

The Slop Coding Era

The hype around AI-generated code is creating a culture where quantity trumps quality. Strategic Domain-Driven Design shows us when LLM can take the lead and when it should stay in a supporting role.

llm ddd

Four garbage bins beneath pipes and air-conditioning units

Dec 8, 2025

Designing with Types: Making illegal states unrepresentable

How to use union types and Effect Schema to encode business rules directly into your domain model, making invalid states impossible at compile time.

Pixel art cover illustration about wrapper types in type-driven design

Nov 18, 2025

Designing with Types: Wrapper Types

How to use TypeScript branded types and Effect to eliminate primitive obsession, validate values at domain boundaries, and make illegal states unrepresentable.