The Dev World – Sergio Lema

Granular Authorization in Spring Boot: Beyond Role Checks

Making Testcontainers Work with Lima on macOS

Event-Driven Architecture with Spring Boot and AWS EventBridge: Escaping the Distributed Monolith

Google Cloud Run Limitations: When Serverless Complexity Outweighs the Cost Savings

The Command Pattern in Java: Eliminating Fat Service Classes with Commands and Handlers

Spring Security 6 OAuth 2.1: Replacing Implicit Grant and ROPC with PKCE

Why JavaScript Floating Point Math Breaks Your App (And How to Fix It)

Fullstack 2026: Building the Modern Spring Boot 3.4 and React 19 Architecture

The JVM Stack: A Developer’s Quick Guide

Choosing a Deployment Strategy: A Developer’s Guide to Canary, Blue-Green, and Rolling Updates

Google Sign-In for React Native: The Complete Setup Guide That Actually Works

Spring @Transactional is Not Magic: The Proxy Trap and Why Your Data Isn’t Safe

The Microservices Tax: Why Your Distributed Architecture is Failing You

The Singleton Delusion: Why Your Implementation is Probably Broken

How to Use System Design in Your React Project

“AWS EC2: Unable to Connect,” a Security Group Checklist for Developers

Why Your Team Needs a Leader, Not Just More Developers

SLF4J, Logback, and Log4j: A Straightforward Guide to Java Logging

Flyway vs. Liquibase: Which Database Migration Tool is Right for You?

VM or Container? The Developer’s Guide to Choosing the Right Isolation

A Three-Step Framework for Launching Your Project

Centralized Error Handling with React useContext

The Art of Prompting for a Developer

The No-Code Backend