@leonardo1903

Leonardo Fernandes

@leonardo1903Joined July 2023

Web & app dev enthusiast exploring blockchain and agentic AI. Building, breaking, learning—one project at a time.

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Leonardo Fernandes's blogs

Leonardo Fernandes's Blogblog.leonardo1903.me10 posts

PWA vs React Native: How to Make the Right Choice

Your startup just closed its seed round. The investors are happy, the product roadmap is locked, and everyone agrees: you need a mobile app — fast. Your CTO wants to go with React Native. "Native perf

Mar 28 · 16 min readblog.leonardo1903.me

Unlocking the Power of MongoDB Aggregation Pipelines

Picture this: you're building an analytics dashboard. You need the top 10 products by revenue for last month, grouped by category, with each product's percentage contribution to its category total, fi

Jun 20, 2025 · 19 min readblog.leonardo1903.me

A Guide to Query Translation in RAG Systems: Key Methods and Examples

Here's a scenario that should feel familiar. Your RAG system retrieves beautifully on test queries. You've tuned chunk sizes, experimented with embedding models, added a reranker. The eval numbers loo

Jun 7, 2025 · 19 min readblog.leonardo1903.me

How Retrieval-Augmented Generation Boosts AI Results: An In-Depth Look

You built a RAG chatbot. You chunked your documents, embedded them, shoved them into a vector store, and wired it to an LLM. It works — mostly. But it hallucinates on questions it should know, misses

Jun 6, 2025 · 19 min readblog.leonardo1903.me

Understanding the Inner Workings of React Native

For three years, the React Native community waited for "the new architecture." JSI, Fabric, TurboModules — names that appeared in GitHub issues and conference talks while most production apps were sti

Jun 1, 2025 · 16 min readblog.leonardo1903.me

Leonardo Fernandes

About

Available for

Leonardo Fernandes's blogs

PWA vs React Native: How to Make the Right Choice

Unlocking the Power of MongoDB Aggregation Pipelines

A Guide to Query Translation in RAG Systems: Key Methods and Examples

How Retrieval-Augmented Generation Boosts AI Results: An In-Depth Look

Understanding the Inner Workings of React Native

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Leonardo Fernandes

About

Available for

Leonardo Fernandes's blogs

PWA vs React Native: How to Make the Right Choice

Unlocking the Power of MongoDB Aggregation Pipelines

A Guide to Query Translation in RAG Systems: Key Methods and Examples

How Retrieval-Augmented Generation Boosts AI Results: An In-Depth Look

Understanding the Inner Workings of React Native