The Dev World – Sergio Lema

Software Architect

Latest on AWS

“AWS EC2: Unable to Connect,” a Security Group Checklist for Developers2025-09-08
AWS API Gateway With A Proxy Lambda and Binary Content2024-10-14
Authenticate Your Spring Application With AWS Cognito2024-10-07
Custom domain For Backend And Frontend In AWS2024-08-26
Router and React Application in AWS S32024-08-12

Latest on CI/CD

Publish a Python Wheel to GCP Artifact Registry with Poetry2025-06-09
Create a GCP Instance Group using Docker2025-01-13
What Does My CI/CD Pipelines Look Like?2024-05-13
How I use Gitflow in real-life projects with GitlabCI2024-05-06
Gitflow Auto-merge Back Script2023-04-24

Latest on Microservices

How Not To Create An Application2024-04-08
How to Calculate the Servers Sizes for my Microservices2023-12-26
Microservices Communications2023-12-11
Microservices vs Serverless2023-11-27
Problems I’ve Learned After Using Microservices Architecture for 10 Years2023-06-26

Latest on Quickies

How to Handle AttributeError: ‘NoneType’ Object Has No Attribute X’ Like a Pro2025-02-03
Optional vs Null2024-12-30
How to Create a Singleton with Java Enums2024-12-09
Estimate a Task in Points or Time2024-10-28
5 Tips to Maintain a Code Clean2024-09-30

Latest on Spring Boot

SLF4J, Logback, and Log4j: A Straightforward Guide to Java Logging2025-08-25
Flyway vs. Liquibase: Which Database Migration Tool is Right for You?2025-08-18
Mastering Data Validation in Java Applications2025-06-02
Multi-Environment Configuration in Spring Boot2025-04-07
Optimize Your API Using Memoization2024-06-03