Engineers' blog

This article is targeted at web developers new to HTTP/2 design in overall, and mainly discusses the way HTTP/2 addressed the HOL blocking problem.

1. Isolate Tests to Avoid Shared StateFlaky tests often arise when tests rely on shared state, meaning the state of one test can affect the outcome of another. This can happen when objects or variables are not reset between tests.Solution:Use let and let! for lazy and eager loading to ensure fresh objects are created for each test.Use before(:each) and after(:each) to reset shared state and prepare the environment for each test.describe User do let(:user) { create(:user) } it 'is valid with a name and email' do expect(user).to be_valid end endAvoid using global variables or objects that persist between tests. Each test should be independent of others to avoid flaky behavior.2. Ens

This guide introduces unit testing in Kotlin, with a focus on Java developers transitioning to Kotlin for backend development. Kotlin, being interoperable with Java, allows developers to leverage familiar tools while benefiting from its concise syntax and modern features. This document covers essential testing frameworks, mocking libraries, and assertion tools tailored for Kotlin, helping you write robust and readable tests.

Writing efficient SQL queries is crucial for database performance, especially when dealing with large datasets. Poorly optimized queries can lead to slow response times, high CPU usage, and excessive memory consumption. Fortunately, by following a few key principles, you can significantly improve query performance. In this guide, we’ll explore seven essential techniques to optimize your SQL queries, from avoiding SELECT * to optimizing JOINs and subqueries. Each technique includes a detailed explanation, performance issues, and improved approaches to help you write faster and more efficient queries.

Feature-Sliced Design (FSD) is an architectural methodology for scaffolding front-end applications. Simply put, it's a compilation of rules and conventions on organizing code. The main purpose of this methodology is to make the project more understandable and stable in the face of ever-changing business requirements.

Exploring CI/CD Tools when deployment

Thinking about earning the PSM I certification? In this article, I share my journey, tips, and resources that helped me pass the exam. From understanding the Scrum Guide to acing the assessment, learn how you can achieve this globally recognized credential and advance your Agile career.

Performance issues can significantly impact user experience, scalability, and operational costs. This article explores common performance problems, their causes, and practical strategies for detecting and resolving them effectively.

This article is targeted at web developers new to Head-of-Line Blocking problem in general, and mainly discusses the form of it in HTTP/1.1.