We hit an at-least-once delivery trap. Here is how we fixed the race conditions.
If you are running an event-driven architecture with message queues like Kafka, you already know the drill, scalability is awesome, but network partit…
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How I Eliminated 19,494 Duplicate MongoDB Records (And What I'd Do Differently Today)
At a previous organization, I was handed ownership of a job platform serving 1,000+ users worldwide. Jobs on the platform could be scoped to a single …
Build a Telegram Paid Access System with Crypto Payments
Telegram is full of communities that already sell access informally. Some sell private trading groups. Some sell language classes. Some sell paid news…
Build a Vertical Crypto Checkout for a Specific Niche
Build a Vertical Crypto Checkout for a Specific Niche Most developers treat checkout as a generic feature. A customer selects a product. The backend c…
How to Define a Backend Contract for a React App
A React interface can look finished while the backend is still a collection of guesses. The screens render. Forms submit. Navigation works. There may …
Your Webhook Receiver Is Offline. Now What?
Webhooks look simple when everything works. A service sends an HTTP request, your application receives it, and the event is processed within milliseco…
Failure Engineering Explained by Uncle to Nephew — Episode 4: Failure Handling
Episode 3 covered detection — how a system finds out something broke. Episode 4 is the next link: detection told you something's wrong, now what? Satu…
An Interactive Express.js API Generator
🚀 I Built exp-gen — An Interactive Express.js API Generator After spending a lot of time creating the same Express.js project structure over and over …
Node.js Syllabus for Beginners 🚀 | Complete Backend Roadmap
Node.js Syllabus for Beginners 🚀 If you're planning to become a Backend Developer, Full Stack Developer, or JavaScript Developer, learning Node.js is …
Protocol Buffers
Protocol Buffers are language-neutral, platform-neutral extensible mechanisms for serializing structured data. How it looks: (filed number + wiretype)…
WebSocket Real-Time Architecture: From Connection Pooling to Graceful Reconnection
Real-time systems are seductive. You build a basic WebSocket connection, messages flow instantly, and it feels like magic. Then your first user's netw…
From REST to MCP (1/2): Different Dimensions
Intro An MCP server can look like another API layer: expose existing REST endpoints as tools and call it a day. Both receive input, execute backend lo…
Failure Engineering Explained by Uncle to Nephew — Episode 3: Failure Detection
Episode 2 gave you the seven categories of failure. Episode 3 answers the first real lifecycle question: once one of those seven happens, how does you…
Backend Engineering
Backend engineering is going through one of the biggest shifts in years many developers are still trying to keep pace. In my opinion, here is what is …
Day 06: HTTP, APIs & Data Exchange
🎯 Learning Objectives By the end of this article, you will understand: The core request/response lifecycle of the Hypertext Transfer Protocol (HTTP). …
Designing an API Gateway: Routing, Auth, and the Filter Chain
Once you split a monolith into services, a new problem appears: the client now needs to know about twenty endpoints, each with its own auth, its own r…
Designing a Rate Limiter: Token Bucket vs Sliding Window, and Making It Distributed
A rate limiter answers one question on every request: has this client made too many calls, and should I reject this one? It sounds trivial until you h…
Tired of heavy decorators/DI just to keep a TypeScript API organized? ZinTrust gives you structure without the ceremony: minimal core, explicit wiring, type-first ergonomics, no Express required. Kick the tires in 2 min — and tell me what's confusing. 👇
ZinTrust: a TypeScript backend framework for structure without decorators zintrust Zin zintrust Zin zintrust Zin Follow Jan 7 ZinTrust: a TypeScript b…
Failure Engineering Explained by Uncle to Nephew — Episode 1: Why Failures Are Normal
New series, same two people from the Node.js Internals series. Where that series answered "how does the system work?", this one answers "how does the …
Moving 20,000+ customers to a new Stripe account without anyone noticing
None of our 20,000+ US customers know this happened: last month, we moved them, their payment methods, subscriptions, credits, coupons, and promotion …
How Reddit Stores Comment Trees and Ranks Hot Posts
Reddit looks simple and hides two genuinely hard problems. Comments nest arbitrarily deep, and a naive tree structure makes loading a busy thread slow…
How Elasticsearch Searches Fast: The Inverted Index and Shard Routing
Searching billions of documents for a phrase and getting ranked results in tens of milliseconds looks like magic. It is not. It comes down to two idea…
Every table you create becomes an instant REST + GraphQL API
I keep rebuilding the same backend. Postgres, then auth, then a little CRUD API on top, then a cache once it gets slow, then websockets when I want li…
Multi-Tenancy And The Concepts Behind It.
Introduction Building a multi-tenant application is one of the most architecturally demanding challenges in backend engineering. It requires deliberat…
Monitoring Python RQ jobs: what to watch and how to get alerted
RQ (Redis Queue) is a delightfully simple way to run background jobs in Python. That simplicity is also why teams under-monitor it: it just works, unt…
Build a Real-Time Dashboard with Python, FastAPI, and WebSockets
Your Dashboard Is Lying to You (And Polling Is Why) Every five seconds, your frontend fires a request. The server wakes up, queries the database, seri…
Free e-book with 60 scenario-based system design interview questions
I wrote down the 60 questions I wish someone had handed me years ago. For a long time I thought system design was about memorizing architectures. Draw…
Building MOC-Compliant Event APIs for Saudi Arabia: QR, WhatsApp & Real-Time Analytics
Saudi Arabia’s event scene exploded after Vision 2030. But if you’re a developer building event tech for KSA, you hit 3 walls fast: MOC compliance for…
Supabase vs Firebase
Both Supabase and Firebase promise the same thing: a backend you don't have to build, with auth, a database, storage, and real-time out of the box. Th…
Defeating Database Lock Contention in High-Concurrency APIs
When thousands of users try to read or update the same state simultaneously—such as real-time cross-platform mobile sync streams—server crashes are ra…