#backend-development

I Moved a Folder, 12 Million Files Disappeared. Then I Learned What “Sync” Really Means

A few days ago, I learned an important engineering lesson the hard way.

Understanding Latency and Throughput: The Twin Pillars of System Performance

In our increasingly connected digital world, performance matters more than ever. Whether you’re building web applications, distributed…

#7: Your QuerySet Runs the Same Query Four Times

Django QuerySets are lazy and re-run the database every time you touch them fresh. Here’s why one endpoint quietly queries four times, and…

#6: null=True on a Text Field Gives You Two Kinds of Empty

The one-word model choice that quietly splits your “empty” into "" and None — and poisons every query that touches it

When Live Location Tracking Starts Crushing Your Database

WebSockets for live delivery. Kafka for decoupling. Same event, two responsibilities.

The Foundations of Backend Engineering — Understanding Databases

The Warehouse of Your Data

Polling vs WebSockets: How Does the Server Talk Back to You?

You click Submit on LeetCode.

One Food Delivery App, Two Architectures: Monolith vs Microservices

You’re hungry, open your favorite food delivery app, find a restaurant, add a pizza to your cart, and hit Place Order.

Top 5 PHP Frameworks for Web Development in 2025

Originally published on the Innostax Engineering Blog

System Requirements দেখে সঠিক Database কীভাবে বেছে নেবেন?

Software Engineer হিসেবে আমরা অনেকেই PostgreSQL, MySQL, MongoDB, Redis — এগুলোর নাম খুব সহজেই বলতে পারি।

9 Django ORM Features That Feel Like Superpowers

The Django ORM looks simple when you first meet it.

Optimistic Concurrency in EF Core

Preventing Lost Updates in Modern .NET Applications

Your AI Built the App. Here’s Everything Else You Still Need

Everything feels automated these days. Doesn’t matter if you’re a software engineer, a doctor, a teacher, or someone who’s never written a…

Java 17 vs Java 25: Is It Finally Time to Upgrade Your Spring Boot App?

Most Java teams think Java 17 is still the safe, current choice for a Spring Boot service.

break vs return in Java: What's the Difference?

One of the most common sources of confusion for beginners is understanding when to use break and when to use return. They both stop…

A GOOD RETRY LOGIC SAVES NINE.

Yes, indeed, “a good retry logic saves nine.”

PostgreSQL 學習筆記：認識資料庫索引與 EXPLAIN ANALYZE

本篇為六角學院2026年node.js直播班中，關於資料庫索引的學習筆記整理，課中使用的資料庫為PostgreSQL，筆記內容來自課程、PostgreSQL官方文件整合而來。

#1: Django’s .update() Skips Your save() and Nobody Warns You

The one-line ORM call that changes your database but silently ignores your signals, validation, and timestamps

Milestone 01 — Backend: parte 01: SDUI e configurações

Contract-first no backend do Pix — fronteiras que escalam

Implementando Pix JSR — Roadmap

Do backend à observabilidade: o roadmap técnico da temporada

Idempotency Keys in Payment APIs: The Small Header That Prevents Double Charges

Introduction: Why retries are dangerous in payment systems

Scaling PostgreSQL to 10 Million+ Records: How PostgreSQL, TimescaleDB, and PgBouncer Helped Us…

As developers, we often hear that once your application reaches millions of records, you’ll eventually need to move away from PostgreSQL.

What Is Swagger? Every Node.js Backend Developer Should Know

When I first started building REST APIs with Node.js and Express.js, my workflow looked something like this:

Data Post 27: Revisit Mary’s IT Application — The Full Circle Moment

It has been a while since we checked in on Sally and Mary.

Expecting Speed, Getting Latency: The Reality of Misusing Async/Await

When I first learned async/await, it felt like best shortcut. I was finally free from the callback hell and the endless .then() chains that…

How .NET Became a Modern Development Platform

Cracking the LLD Interview: Designing an Inventory Management System with Domain-Driven Design

Why “just track a count” is the wrong mental model — and how aggregate boundaries protect you from negative stock.

Why Are You Still Relying on External Cron Jobs?

Introduction

Building a Production-Grade Backup Automation & Disaster Recovery System

One of the most overlooked parts of software engineering is preparing for the day something goes wrong.

After 3 Years and 200M Rows, I Finally Stopped Using UUIDs as Primary Keys

The alert hit my phone while I was mid bite into a sandwich, and my first thought was that someone had restarted the wrong service again.

Java ve Spring Boot ile Modern Backend Geliştirme

Java, yıllardır kurumsal yazılım geliştirme dünyasının en çok tercih edilen programlama dillerinden biri olmaya devam ediyor. Özellikle…

Database Normalization: A Complete Guide to Organizing Databases Efficiently

Every modern application relies on well-organized data. Whether you’re building an e-commerce platform, banking system, or student portal…

Techvibe Gujrat — Where Tech Meets the Future

Best Web Development Course in Gujrat — Build In-Demand Skills at ADAN IT Center

Session Hijacking & Injection

Not every security vulnerability requires advanced hacking skills.

My Microsoft MVP Desk Ring Accidentally Became a Lesson in Distributed Systems

A few days ago, Microsoft renewed my MVP award for another year.

Pain point #3: Django’s Missing Battery: Background Tasks

Django finally shipped a task framework in 2026 and left out the one part that actually runs the tasks

Our Rate Limit Said 100 a Minute. Behind 50 Gateways, It Was 5,000.

The token bucket took an afternoon. Getting fifty machines to agree on one count took three rebuilds.

Pain point #2: Django’s ORM Performance Problem

The abstraction that makes Django a joy is the same one that quietly wrecks your database

REST API Fundamentals: The Internet’s Common Language Every AI Engineer Must Speak

AI Agent Engineer Roadmap Series: Foundations

🚨 It Worked in Postman… Why Is the Browser Blocking It?

Understanding the CORS error that confuses every developer

The Civil War: CommonJS vs. ESM

This has been a hot topic for debate for a while now. I think it’s time for us to settle the debate and choose the one which is best suited…

8 API Helper Functions I Never Build Without

No matter what kind of application I’m building — whether it’s a React dashboard, a Next.js project, or a simple JavaScript app — I always…

Building a Social Media: Backend Router Programming

Welcome back to the journey! I left off in the last article by talking about the backend services that I was planning to use and the…

I Ignored Backpressure in My Go Worker and the Queue Became a Memory Problem

The worker looked reliable while traffic was calm, but once jobs arrived faster than they could be processed, the queue quietly started…

2026 상반기 회고 — 개발자로 보낸 첫 6개월

작년 겨울, 백엔드 개발자로 첫 출근을 했다. 6개월이 지난 지금 기록을 뒤져보니 생각보다 많은 일이 있었다. 카테고리별로 하나씩 정리하고 가려 한다.

I Spent 8 Hours Debugging a Spring Boot Bug That Only Happened in Production

Timezone. UTF-8. Connection pool. Race condition.

Day 8 — Serving Static Files in Flask

Learn how to add CSS, JavaScript, images, and other static assets to your Flask applications

The Mistake That Made Server and Client Logic Fight Each Other

The bug did not come from the server or the client alone. It came from letting both sides believe they owned the same decision.

Better Auth with Express, Prisma & Next.js: Build a Secure Production Authentication System

Master Better Auth from the ground up with a real-world Express and Next.js architecture. Explore authentication, authorization, OAuth…

Harnessing the Power of Laravel Queues for Performance Boost

Why Queues Are the Unsung Heroes of Performance Optimization