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Dev.to·Saturday, January 17, 2026

Dev.to - Saturday, January 17, 2026

10 stories~15 min

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Stories Covered

01

🚨 One filename change. Zero errors. Production broken.

A small Git detail taught me a production-level lesson the hard way.** I recently ran into a subtle issue while working with Git on Windows. It looked harmless at first — until it showed up in production. I had a file named DEV.html. Later, I renamed it locally to dev.html (just a case change) and pushed again. But in production, links like <a href="dev.html"> started returning 404 – Page Not Found. After some digging, I realized GitHub still had the file named DEV.html. 🔍 What was happening? W

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03

What No One Tells You About Building an AI SaaS Business

Building an AI SaaS business looks straightforward right now. Pick a model. From the outside, it feels like the easiest era in history to launch software. But the reality is harsher and more interesting. Because what most people call “AI SaaS” is not SaaS in the traditional sense. It’s a different business shape with different constraints. And if you treat it like ordinary SaaS, you’ll build something that looks good in a demo and struggles everywhere else. Here’s what no one tells you, until yo

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04

Backend Transitioning to AI Dev

After working with LLMs, I believe the hardest part of the transition for backend engineers isn't the math—it's unlearning determinism. In traditional distributed systems, Input A always yields Output B. If it doesn't, it’s a bug. With GenAI, Input A might yield Output B today, and a completely different structure tomorrow. This breaks everything we know about stability at scale. You can't write a standard unit test for a "vibe check." You can't rely on a model to output valid JSON 100% of the t

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05

Did you know?

The cloud isn’t just about technology, it’s changing how businesses operate. Companies can now launch products faster, scale services instantly, and reach global customers without huge upfront costs. This flexibility allows new business models like subscription services, pay-as-you-go apps, and digital marketplaces to thrive. It’s like moving from owning DVDs to streaming movies, simple, affordable, and accessible anywhere.

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06

Building a Smart Inbox: AI-Powered Message Routing on AWS EKS

Real-time sentiment analysis and intelligent message prioritization using Kubernetes, AWS Bedrock, and React In this comprehensive guide, I'll walk you through building a production-ready, AI-powered message routing system using AWS services. This project demonstrates how to leverage modern cloud-native technologies to create an intelligent application that automatically analyzes message sentiment and routes them accordingly. What We Built: A sentiment analysis API using AWS Bedrock (Claude 3 H

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07

Why Array Index Starts from 0: The Real Reason Behind the Scenes

If you’ve ever written code, you’ve probably asked this question at least once: “Why do arrays start from index 0 instead of 1?” At first glance, starting from 1 feels more natural. Humans count 1, 2, 3…, not 0, 1, 2…. Yet almost every major programming language—C, C++, Java, Python, JavaScript—uses zero-based indexing. This is not a random decision. Let’s break down the real reasons, from hardware memory to compiler design, and see why index 0 is actually the most efficient choice. Behind the s

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08

Universal Agent + Skills Tutorial: Build Your 10-Person Team from Scratch

Universal Agent + Skills Tutorial: Build Your 10-Person Team from Scratch Imagine this: You tell your AI Agent: "Write me technical documentation." It instantly loads technical-writer.skill and transforms into a tech writer. Next moment: "Analyze our competitors' ad strategies." It swaps in marketing-analyst.skill and starts crawling data. Even better: Need an expert in a niche domain—say, "SQL performance tuning"—but can't find one? Let the Agent write a skill for itself. This isn't sci-fi. A

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09

Laravel API Inspector - Auto Generate API Documentation

Laravel API Inspector automatically generates API documentation from your Laravel routes, FormRequest validation rules, and API Resources. It's like Postman + Swagger combined, but deeply integrated with Laravel. This is the git repository https://github.com/irabbi360/laravel-api-inspector Features ✨ Auto-Parse FormRequest Rules - Converts Laravel validation rules into comprehensive documentation Installation PHP: 8.1 or higher composer require irabbi360/laravel-api-inspector Run the interactive

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10

'Chainguard' image for secure service

If you work as DevOps or system backend development, one of critical point causing your stress will be 'security'. Even though it is always at the top of the priority list, its substance remains elusive. Assume you are maintaining k8s cluster, or docker image(in recent system, most of devops engineer will be related at least one of these). Even if your code is secure, the base image (Debian, Ubuntu, or even Alpine) often carries inherent technical debt, and within that debt, there are often secu

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