Large language models don’t actually follow a format. They generate text by sampling probabilities, one token at a time. You can write the best prompt imaginable—« Respond only with valid JSON. This is extremely important. »—and the model will still occasionally get it wrong. Not every time, but often enough to break a production application. As long…
« I don’t write prompts anymore. I build loops. » Several major figures in AI have been repeating some version of this sentence for a few months now, and it’s worth pausing on. Boris Cherny, the creator of Claude Code, explained in an interview that he barely writes prompts himself anymore. His work now consists of building…
RAGAS and DeepEval both score RAG systems: faithfulness, context precision, contextual relevancy. The metrics overlap 80%. What separates them is where and how you use them. RAGAS was born from a research paper. DeepEval was born from a CI/CD need. It shows in both APIs, and it determines which one you should install first. On…
You want to fine-tune an LLM. Chances are, you don’t need to. There’s a trap that almost every developer falls into the first time they explore fine-tuning. They see an LLM that doesn’t know their product, their terminology, or their brand voice. So they start looking for ways to adapt it. They come across fine-tuning….
I used to think vector search was enough.
It isn’t.
Embeddings capture the overall meaning of a text, not its fine-grained requirements.
And when you search for ** »React Senior Paris »** and get ** »React Junior Lyon »** as the top result, that’s exactly the problem: a search engine that understands the domain, but not the actual query.
I wrote a deep dive on the **Retrieve → Re-rank** pipeline: why Dense Retrieval alone eventually hits its limits, how Cross-Encoders fix the problem, and how the two work together in modern RAG architectures.
Introduction Auth0 is a very powerful solution to manage the authentication of your applications.Even if its documentation is very well done, it is not immediate to understand how to use it.The PHP SDKs allow you to do many things and today I would like to show how I use them to authenticate a user in a Symfony…
Introduction I will soon be changing jobs and the clean architecture is used in the new company. So I decided to experiment with it by making a POC.Maybe it can inspire someone. Or could someone help me to correct any errors in my approach. As far as I could understand there are two main approaches…
In my latest article I showed my implementation of the Pattern Builder with support of Symfony’s Service Tag.I love this Symfony service, and this time I would like to show you how to use it to implement another design pattern: The Visitor pattern, less known than the Builder pattern but also very nice and useful. To do this we…
I would like to show you my implementation of the very popular Pattern Builder in PHP using the Symfony framework I will not dwell on this pattern, because there are hundreds of articles that already do this. We can simply say that: Builder is a creational design pattern that lets you construct complex objects step by step….
Example of a Symfony application using Domain-Driven Design (DDD) and Command Query Responsibility Segregation (CQRS) principles keeping the code as simple as possible. The whole code can be found here. Environment Setup Needed tools Install Docker Clone this project: git clone https://github.com/salletti/symfony-ddd-example.git Move to the project folder: $ cd symfony-ddd-example Application execution If not already done, install Docker Compose Run docker-compose…