From Backend to Breach-Aware Part 0: The Router That Was Built
Dine Flow was a six-person cohort project, a restaurant inventory and order-management platform, built in about six weeks. Six people means six sets…
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Defeating the Multi-Tenant SaaS Concurrency Trap in PostgreSQL
Most backend engineers implement multi-tenant quota checks using a standard "read-then-write" pattern. In production, this pattern is highly unsafe:…
A Small Refresh Bug That Uncovered Security Gaps in My OTP System
The Bug That Started It All It began as a small bug I found myself while testing: OTP verification kept failing whenever I refreshed the page, opene…
Shifting Left: How TDD Became the Foundation of SokoFlow's Core Engine
SokoFlow Build Log — Month 1 of 4 Last semester I set out on a new strategic plan to level up my software development skills through deliberate, pro…
Eventual Consistency Is Misunderstood by Most Engineers
I've interviewed dozens of engineers at the senior level. When I ask them to explain eventual consistency, most recite the textbook answer: "data wi…
Library Oriented Architecture: The Most Interesting Architecture Pattern You've Probably Never Heard About
Hello! I'm Jairo Jr, your favorite Dev.to writter, or something like this 😄. Over the last few years, I've spent a lot of time studying software arc…
Mastering Node.js HTTP Module: Build Servers, REST APIs, and Handle Requests
Introduction to the HTTP Module Modern web applications rely heavily on communication between clients and servers. Whether you are building a REST A…
How the Internet Actually Works: Understanding Client-Server Architecture with Real Code
How the Internet Actually Works: Understanding Client-Server Architecture with Real Code The Big Picture: What Happens When You Visit a Website? Eve…
How to Build a REST API with Node.js and Express from Scratch
How to Build a REST API with Node.js and Express from Scratch Create a production‑ready RESTful API step‑by‑step using Node.js, Express, and modern…