📰 Dev.to · Pablo Ifrán

The honest finale to the Hexagonal Architecture series. Real costs, common pitfalls, when the pattern is overkill, and a practical decision framework for Python

How to wire domain objects, ports, and adapters into a real FastAPI app using dependency injection. Covers the application layer, adapter swapping for tests, an

Anemic domain models put business rules everywhere except where they belong. Here's how to build domain objects with real behavior, value objects with self-vali

Your domain shouldn't reach out to your database. Here's the pattern that enforces that boundary — with a full before/after refactor using Python, FastAPI, and

Most backend code conflates what your software does with how it does it. That confusion has a cost — and it compounds over time.

Complete optimization guide for PostgreSQL vector databases: memory tuning, index strategies, query optimization, and troubleshooting for production scale.

Step-by-step guide to building RAG systems that actually work in production, with working code and performance optimization

Real cost comparisons and performance benchmarks show PostgreSQL beats specialized vector databases for most AI use cases