Author: Sergio Lema
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Multi-Environment Configuration in Spring Boot
In this article, I talk about the importance of proper configuration in Spring Boot applications across multiple environments. By using Maven profiles, environment variables, and CI/CD pipelines, developers can maintain clean and flexible configurations. The goal is to ensure a seamless application experience whether running locally or in production, without the risk of misconfigurations.
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React Performance Tips and Tools
In this article, I discuss the importance of optimizing React app performance, placing the responsibility on developers rather than blaming users. I highlights common issues, such as unnecessary re-renders, inefficient state management, and large bundle sizes. Solutions include memoization, flattening component trees, state centralization, code splitting, and using appropriate tools for diagnosis and improvement.
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I’ve Created a RAG in Two Days
In the AI era, web developers must integrate AI into projects to stay relevant. I’ve built a Retrieval-Augmented Generation (RAG) system in two days, combining a knowledge database with an LLM. Key components included data chunking and retrieval. The project showcased AI’s ability to provide specific responses, using creative datasets for testing.
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Forms in React, with or without React Forms
Forms in web development are essential for user interaction, yet often frustrating. This content compares traditional HTML forms with React Form Components, discussing their pros and cons. Basic forms are simplistic but limited in validation, while React libraries enhance user experience with advanced features. Choose based on form complexity and validation needs.
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Stop & Start GCP SQL Instances at Nights
One of the great things about Google Cloud SQL instances is that they let me shut them down at night. The data sticks around (hopefully), but I can’t access it, which is exactly what I want. Since my backend servers are already tucked in for the night (explained in another article), keeping the database running…
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SQLAlchemy and JSON values
Storing JSON in a relational database? Sounds like a contradiction, but sometimes, it’s the best solution. SQLAlchemy makes it easy to use a JSON column in Postgres—until you try to update a single value inside it. Turns out, SQLAlchemy doesn’t track those changes by default, leading to silent failures. The fix? Marking the column as…
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GCP Cloud Functions with SQL Access
I’ve created a Google Cloud Function for a weekly task to streamline backend dependencies but faced complications with database connectivity. GCP requires a proxy, which undermines the initial goal of simplicity. Ultimately, I’ve moving all back into an existing backend to save extra fees from having a proxy up and running.
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Deploying a Spring Boot Application to AWS ECS Fargate
Why AWS ECS is Your New Best Friend for Microservices So, you’ve built a shiny new Spring Boot application, and now you’re wondering how to deploy it without losing your sanity. Enter AWS ECS (Elastic Container Service), the managed container orchestration service that lets you run Docker containers without having to babysit a Kubernetes cluster.…
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Handle The Errors with Flask Correctly
Effective error management in Flask applications is crucial for security, usability, and debugging. Implement custom exceptions to centralize handling and use blueprints for clean error responses. Additionally, log useful details while avoiding exposing sensitive information. This strategy ensures a better user experience and maintains application integrity.
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How to Center Content into a DIV with CSS
It’s always hard to centering content in a div using CSS, particularly for backend developers. I advocate for the use of Flexbox, explaining properties like display, justify-content, and align-items to achieve perfect central alignment. Understanding these concepts eases the frustration of frontend tasks.
The Dev World - Sergio Lema 