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: S…
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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, opened …
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, proje…
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 will…
Building a Production Grade Authentication System with NestJS
Building a Production Grade Authentication System with NestJS Security is not a feature you bolt on after the fact. It is an architectural decision th…
Prisma vs Drizzle ORM: A Comprehensive Comparison
“Your ORM should fit your project, not just your taste.” A Practical Guide to Choosing Between Prisma and Drizzle ORM for Modern TypeScript Applicatio…
Building a Clean and Maintainable API Layer in SaaS Platforms
A well‑designed API layer is the backbone of any SaaS platform. It defines how internal modules communicate, how external integrations work, and how r…
AI-Powered Node.js: Why Node.js + AI Is Becoming a Powerful Combination
For the last few years, I've been working mostly with Node.js for building scalable APIs, backend services, and cloud-based applications. Recently, I'…
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 archi…
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? Every…
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 be…
From a For-Loop to a Fault-Tolerant Payout System (₹70L/month, 0 Duplicate Payments)
How we moved from a fragile loop-based payout system to a reliable, idempotent, and traceable architecture. Paying Money Is Easy. Paying It Correctly …