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"https://sergiolema.dev/2025/02/03/how-to-handle-attributeerror-nonetype-object-has-no-attribute-x-like-a-pro/", "published_at": "2025-02-03T06:00:00+00:00" }, { "id": "01a0caf5-9b65-729b-9872-0a221515d601", "title": "Forgot Password Feature with Python and Flask", "url": "https://sergiolema.dev/2025/01/27/forgot-password-feature-with-python-and-flask/", "published_at": "2025-01-27T06:00:00+00:00" }, { "id": "01a0caf5-9b65-729b-9872-0a2215fac823", "title": "Shut Down GCP Instance Groups at Nights", "url": "https://sergiolema.dev/2025/01/20/shut-down-gcp-instance-groups-at-nights/", "published_at": "2025-01-20T06:00:00+00:00" }, { "id": "01a0caf5-9b65-729b-9872-0a22169b81bd", "title": "Create a GCP Instance Group using Docker", "url": "https://sergiolema.dev/2025/01/13/create-a-gcp-instance-group-using-docker/", "published_at": "2025-01-13T06:00:00+00:00" }, { "id": "01a0caf5-9b65-729b-9872-0a2217241aa0", "title": "How to Create A GCP Instance Group Easily", "url": "https://sergiolema.dev/2025/01/06/how-to-create-a-gcp-instance-group-easily/", "published_at": "2025-01-06T06:30:30+00:00" }, { "id": "01a0caf5-9b65-729b-9872-0a221794a161", "title": "Optional vs Null", "url": "https://sergiolema.dev/2024/12/30/optional-vs-null/", "published_at": "2024-12-30T06:00:00+00:00" }, { "id": "01a0caf5-9b65-729b-9872-0a2218188901", "title": "Create a GCP Bucket with a Custom Domain", "url": "https://sergiolema.dev/2024/12/23/create-a-gcp-bucket-with-a-custom-domain/", "published_at": "2024-12-23T06:00:00+00:00" }, { "id": "01a0caf5-9b65-729b-9872-0a22184186b4", "title": "3 Steps to Estimate a Task with Precision", "url": "https://sergiolema.dev/2024/12/16/3-steps-to-estimate-a-task-with-precision/", "published_at": "2024-12-16T06:00:00+00:00" }, { "id": "01a0caf5-9b65-729b-9872-0a221930239c", "title": "How to Create a Singleton with Java Enums", "url": "https://sergiolema.dev/2024/12/09/how-to-create-a-singleton-with-java-enums/", "published_at": "2024-12-09T06:00:00+00:00" }, { "id": "01a0caf5-c099-7325-8c3f-5352022392e2", "title": "How to Solve the CORS error with Flask", "url": "https://sergiolema.dev/2024/12/02/how-to-solve-the-cors-error-with-flask/", "published_at": "2024-12-02T06:00:00+00:00" }, { "id": "01a0caf5-c099-7325-8c3f-5352022d77af", "title": "How to Organize the Packages of your Project?", "url": "https://sergiolema.dev/2024/11/25/how-to-organize-the-packages-of-your-project/", "published_at": "2024-11-25T06:00:00+00:00" }, { "id": "01a0caf5-c099-7325-8c3f-535202f67db9", "title": "Git Reset", "url": "https://sergiolema.dev/2024/11/18/git-reset/", "published_at": "2024-11-18T06:00:00+00:00" }, { "id": "01a0caf5-c099-7325-8c3f-5352034dd2eb", "title": "OAuth2, Which Workflow to Choose?", "url": "https://sergiolema.dev/2024/11/11/oauth2-which-workflow-to-choose/", "published_at": "2024-11-11T06:00:00+00:00" }, { "id": "01a0caf5-c099-7325-8c3f-535203701cd9", "title": "5 Essential Tips for Securing Your Spring Application", "url": "https://sergiolema.dev/2024/11/04/5-essential-tips-for-securing-your-spring-application/", "published_at": "2024-11-04T06:00:00+00:00" }, { "id": "01a0caf5-c099-7325-8c3f-535203e69a83", "title": "Estimate a Task in Points or Time", "url": "https://sergiolema.dev/2024/10/28/estimate-a-task-in-points-or-time/", "published_at": "2024-10-28T06:00:00+00:00" }, { "id": "01a0caf5-c099-7325-8c3f-535204ceb056", "title": "Understand the Most Important DNS Records", "url": "https://sergiolema.dev/2024/10/21/understand-the-most-important-dns-records/", "published_at": "2024-10-21T05:00:00+00:00" }, { "id": "01a0caf5-c099-7325-8c3f-5352051ffc9e", "title": "AWS API Gateway With A Proxy Lambda and Binary Content", "url": "https://sergiolema.dev/2024/10/14/aws-api-gateway-with-a-proxy-lambda-and-binary-content/", "published_at": "2024-10-14T05:00:00+00:00" }, { "id": "01a0caf5-c099-7325-8c3f-5352058a2c81", "title": "Authenticate Your Spring Application With AWS Cognito", "url": 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"title": "When It’s Time To Refactor", "url": "https://sergiolema.dev/2024/09/02/when-its-time-to-refactor/", "published_at": "2024-09-02T05:00:00+00:00" }, { "id": "01a0caf5-dfa2-7330-94b4-567cf2962bc2", "title": "Custom domain For Backend And Frontend In AWS", "url": "https://sergiolema.dev/2024/08/26/custom-domain-for-backend-and-frontend-in-aws/", "published_at": "2024-08-26T05:00:00+00:00" }, { "id": "01a0caf5-dfa2-7330-94b4-567cf3797f8c", "title": "The 5 Keys to Effective RESTful API Design", "url": "https://sergiolema.dev/2024/08/19/the-5-keys-to-effective-restful-api-design/", "published_at": "2024-08-19T05:00:00+00:00" }, { "id": "01a0caf5-dfa2-7330-94b4-567cf468468b", "title": "Router and React Application in AWS S3", "url": "https://sergiolema.dev/2024/08/12/router-and-react-application-in-aws-s3/", "published_at": "2024-08-12T05:00:00+00:00" }, { "id": "01a0caf5-dfa2-7330-94b4-567cf50cfa64", "title": "Which HTTP Response Code to Use?", "url": "https://sergiolema.dev/2024/07/29/which-http-response-code-to-use/", "published_at": "2024-07-29T05:00:00+00:00" }, { "id": "01a0caf5-dfa2-7330-94b4-567cf60119e9", "title": "OAuth2 With Google, Spring Boot And Angular", "url": "https://sergiolema.dev/2024/07/22/oauth2-with-google-spring-boot-and-angular/", "published_at": "2024-07-22T05:00:00+00:00" }, { "id": "01a0caf5-dfa2-7330-94b4-567cf684da59", "title": "Which HTTP Verb to Use?", "url": "https://sergiolema.dev/2024/07/15/which-http-verb-to-use/", "published_at": "2024-07-15T05:00:00+00:00" }, { "id": "01a0caf5-fc29-723e-9e52-b90f12b92bbd", "title": "3 Ways To Store Passwords Securely", "url": "https://sergiolema.dev/2024/07/08/3-ways-to-store-passwords-securely/", "published_at": "2024-07-08T05:00:00+00:00" }, { "id": "01a0caf5-fc29-723e-9e52-b90f130c96ea", "title": "Use Pagination to Speed Up Your API", "url": "https://sergiolema.dev/2024/07/01/use-pagination-to-speed-up-your-api/", "published_at": "2024-07-01T05:00:00+00:00" }, { "id": "01a0caf5-fc29-723e-9e52-b90f1331fd8f", "title": "6 Tips To Keep Your Code Clean", "url": "https://sergiolema.dev/2024/06/24/6-tips-to-keep-your-code-clean/", "published_at": "2024-06-24T05:00:00+00:00" }, { "id": "01a0caf5-fc29-723e-9e52-b90f13ba62d9", "title": "5 Productivity Tips To Work From Home", "url": "https://sergiolema.dev/2024/06/17/5-productivity-tips-to-work-from-home/", "published_at": "2024-06-17T05:00:00+00:00" }, { "id": "01a0caf5-fc29-723e-9e52-b90f13fbb34c", "title": "Feature Flags: Deploy Unstable Features", "url": "https://sergiolema.dev/2024/06/10/feature-flags-deploy-unstable-features/", "published_at": "2024-06-10T05:00:00+00:00" }, { "id": "01a0caf5-fc29-723e-9e52-b90f147733fa", "title": "Optimize Your API Using Memoization", "url": "https://sergiolema.dev/2024/06/03/optimize-your-api-using-memoization/", "published_at": "2024-06-03T05:00:00+00:00" }, { "id": "01a0caf5-fc29-723e-9e52-b90f148c74b0", "title": "Security In The Cloud: 7 AWS Best Practices", "url": "https://sergiolema.dev/2024/05/27/security-in-the-cloud-7-aws-best-practices/", "published_at": "2024-05-27T05:00:00+00:00" }, { "id": "01a0caf5-fc29-723e-9e52-b90f154cb1f1", "title": "Deploy A Spring Boot Application in AWS Lambda", "url": "https://sergiolema.dev/2024/05/20/deploy-a-spring-boot-application-in-aws-lambda/", "published_at": "2024-05-20T05:00:00+00:00" }, { "id": "01a0caf5-fc29-723e-9e52-b90f15b4dc4b", "title": "What Does My CI/CD Pipelines Look Like?", "url": "https://sergiolema.dev/2024/05/13/what-does-my-ci-cd-pipelines-look-like/", "published_at": "2024-05-13T05:00:00+00:00" }, { "id": "01a0caf5-fc29-723e-9e52-b90f15f67515", "title": "How I use Gitflow in real-life projects with GitlabCI", "url": "https://sergiolema.dev/2024/05/06/how-i-use-gitflow-in-real-life-projects-with-gitlabci/", "published_at": "2024-05-06T05:00:00+00:00" } ] posts Claim your blog

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2026

Optimizing Frontend Tables: Why Client-Side Processing Is Not a Strategy – Part 1 original ↗

21 Sept 2026

Optimizing Your Context Window: How to Stop Burning Tokens in Python Projects original ↗

14 Sept 2026

How to Synchronize Read and Write Databases in a CQRS Architecture original ↗

7 Sept 2026

Stop Being an AI Babysitter: How to Use LLMs Without Losing Code Ownership original ↗

3 Aug 2026

Centralizing Pricing Logic: Stop Scattering Your Business Rules original ↗

27 Jul 2026

Why AI Won’t Replace Developers Who Lead the Tool original ↗

20 Jul 2026

Modern State Management in React: Stop Using Redux for Server Data original ↗

13 Jul 2026

Structured Logging in Java Microservices: SLF4J, MDC, and Distributed Tracing in Practice original ↗

6 Jul 2026

Why I Stopped Calling Myself a Full-Stack Developer original ↗

29 Jun 2026

The Saga Pattern: Managing Distributed Transactions Without Losing Your Mind original ↗

22 Jun 2026

Why AI is Replacing Junior Developers and How Mid-Level Engineers Can Survive original ↗

15 Jun 2026

Choosing the Right AI Coding Agent: Claude Code vs. GitHub Copilot vs. Gemini Code Assist original ↗

8 Jun 2026

Why You Should Never Use Floating Point for Money original ↗

1 Jun 2026

Optimizing Search Performance with CQRS: Relational Writes and NoSQL Reads original ↗

25 May 2026

Granular Authorization in Spring Boot: Beyond Role Checks original ↗

18 May 2026

Making Testcontainers Work with Lima on macOS original ↗

11 May 2026

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

4 May 2026

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

27 Apr 2026

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

20 Apr 2026

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

13 Apr 2026

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

6 Apr 2026

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

30 Mar 2026

The JVM Stack: A Developer’s Quick Guide original ↗

23 Mar 2026

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

16 Mar 2026

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

9 Mar 2026

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

2 Mar 2026

The Microservices Tax: Why Your Distributed Architecture is Failing You original ↗

23 Feb 2026

The Singleton Delusion: Why Your Implementation is Probably Broken original ↗

16 Feb 2026

2025

How to Use System Design in Your React Project original ↗

15 Sept 2025

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

8 Sept 2025

Why Your Team Needs a Leader, Not Just More Developers original ↗

1 Sept 2025

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

25 Aug 2025

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

18 Aug 2025

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

11 Aug 2025

A Three-Step Framework for Launching Your Project original ↗

4 Aug 2025

Centralized Error Handling with React useContext original ↗

28 Jul 2025

The Art of Prompting for a Developer original ↗

21 Jul 2025

The No-Code Backend original ↗

14 Jul 2025

MagicMock with Python original ↗

8 Jul 2025

Layered Architecture in Java: A Practical Guide to Keeping Your Code Clean original ↗

30 Jun 2025

3 JVM Parameters You Must Know original ↗

23 Jun 2025

The CEO’s Guide to Choosing the Right Tech Stack original ↗

16 Jun 2025

Publish a Python Wheel to GCP Artifact Registry with Poetry original ↗

9 Jun 2025

Mastering Data Validation in Java Applications original ↗

2 Jun 2025

3 Signs Your Website Is Slowing Down Your Company’s Growth original ↗

26 May 2025

Architecture, DevOps and Security: The 3 Pillars to Grow A Product original ↗

19 May 2025

Python Unittest Mocking Constructors original ↗

12 May 2025

Debug Server Performance original ↗

5 May 2025

Architecture for my Generative AI Application original ↗

28 Apr 2025

Advantages and Disadvantages of Alembic original ↗

21 Apr 2025

Mastering Docker Compose for Local Development and Testing original ↗

14 Apr 2025

Multi-Environment Configuration in Spring Boot original ↗

7 Apr 2025

React Performance Tips and Tools original ↗

31 Mar 2025

I’ve Created a RAG in Two Days original ↗

24 Mar 2025

Forms in React, with or without React Forms original ↗

17 Mar 2025

Stop & Start GCP SQL Instances at Nights original ↗

10 Mar 2025

SQLAlchemy and JSON values original ↗

3 Mar 2025

GCP Cloud Functions with SQL Access original ↗

24 Feb 2025

Deploying a Spring Boot Application to AWS ECS Fargate original ↗

17 Feb 2025

Handle The Errors with Flask Correctly original ↗

17 Feb 2025

How to Center Content into a DIV with CSS original ↗

10 Feb 2025

How to Handle AttributeError: ‘NoneType’ Object Has No Attribute X’ Like a Pro original ↗

3 Feb 2025

Forgot Password Feature with Python and Flask original ↗

27 Jan 2025

Shut Down GCP Instance Groups at Nights original ↗

20 Jan 2025

Create a GCP Instance Group using Docker original ↗

13 Jan 2025

How to Create A GCP Instance Group Easily original ↗

6 Jan 2025

2024

Optional vs Null original ↗

30 Dec 2024

Create a GCP Bucket with a Custom Domain original ↗

23 Dec 2024

3 Steps to Estimate a Task with Precision original ↗

16 Dec 2024

How to Create a Singleton with Java Enums original ↗

9 Dec 2024

How to Solve the CORS error with Flask original ↗

2 Dec 2024

How to Organize the Packages of your Project?original ↗

25 Nov 2024

Git Reset original ↗

18 Nov 2024

OAuth2, Which Workflow to Choose?original ↗

11 Nov 2024

5 Essential Tips for Securing Your Spring Application original ↗

4 Nov 2024

Estimate a Task in Points or Time original ↗

28 Oct 2024

Understand the Most Important DNS Records original ↗

21 Oct 2024

AWS API Gateway With A Proxy Lambda and Binary Content original ↗

14 Oct 2024

Authenticate Your Spring Application With AWS Cognito original ↗

7 Oct 2024

5 Tips to Maintain a Code Clean original ↗

30 Sept 2024

How To Create SSH Keys original ↗

23 Sept 2024

Code Review Tips original ↗

16 Sept 2024

Where To Write Documentation original ↗

9 Sept 2024

When It’s Time To Refactor original ↗

2 Sept 2024

Custom domain For Backend And Frontend In AWS original ↗

26 Aug 2024

The 5 Keys to Effective RESTful API Design original ↗

19 Aug 2024

Router and React Application in AWS S3 original ↗

12 Aug 2024

Which HTTP Response Code to Use?original ↗

29 Jul 2024

OAuth2 With Google, Spring Boot And Angular original ↗

22 Jul 2024

Which HTTP Verb to Use?original ↗

15 Jul 2024

3 Ways To Store Passwords Securely original ↗

8 Jul 2024

Use Pagination to Speed Up Your API original ↗

1 Jul 2024

6 Tips To Keep Your Code Clean original ↗

24 Jun 2024

5 Productivity Tips To Work From Home original ↗

17 Jun 2024

Feature Flags: Deploy Unstable Features original ↗

10 Jun 2024

Optimize Your API Using Memoization original ↗

3 Jun 2024

Security In The Cloud: 7 AWS Best Practices original ↗

27 May 2024

Deploy A Spring Boot Application in AWS Lambda original ↗

20 May 2024

What Does My CI/CD Pipelines Look Like?original ↗

13 May 2024

How I use Gitflow in real-life projects with GitlabCI original ↗

6 May 2024