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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Understanding Data Models: Benefits, Trade-offs, and History
The Object-Relational Mismatch Most development takes place in object-oriented programming (OOP) languages, which leads to a common criticism of the S…
Cybersecurity 101 : Windows Notifications
Introduction So imagine you are focused on your cappuccino-frappuccino doing something very important on you win laptop and then have a cringe attack …
Why Early MVPs Fail Before Launch
Most MVPs do not fail because the first version is too small. They fail because the first version is not focused enough. A real MVP is not just a redu…
Reverse Proxy vs Load Balancer vs API Gateway: The Real Difference
Imagine you have built a backend server that handles requests perfectly in development. It easily survives a few hundred users. Then, your application…
Why System Design Matters More Than Ever in the Age of LLMs
The industry is currently obsessed with letting Large Language Models (LLMs) output entire microservices, infrastructure layouts, and functional code …
Own the roadmap, not the backlog
Nobody tells you the day the work stops arriving pre-decided. For two years the work arrives pre-decided. "Add a price filter to search." You open the…
Day 5 of 30: Message Queues and Why Not Everything Needs an Instant Response
Day 1: the big picture. Day 2: databases. Day 3: caching. Day 4: load balancing, and how the load balancer itself becomes a new single point of failur…
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…
# The Complete TypeScript Mastery Guide
Learn TypeScript From First Principles to Senior/Staff-Level Production Engineering If you searched for how to learn TypeScript properly — not just th…
What Developers Should Know Before Building Software for Factories
Manufacturing software looks simple from the outside. There are products, orders, inventory, suppliers, machines, customers, and invoices. At first gl…
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…
Execution Latency in My Polymarket Trading Bot - Sub-Second Trade Execution System Design
Speed on Polymarket is not what I thought it was when I started building this. I assumed faster was always better. Get the signal, fire the order, win…
Designing an API-First Value-Based Care Analytics Stack for MA Payers
If you build software for Medicare Advantage (MA) plans, "analytics" usually arrives as a vague requirement and leaves as a pile of nightly batch jobs…
trelix v1.0 to v2.7: When "It Works" Meets "It Scales"
Twelve days after I shipped trelix v1.0.0, I was staring at a RetrievalConfig object with two conflicting sets of values and no idea which one was act…
Architecting 21-Service E-commerce with Golang & DDD
Answer-first: Migrating an e-commerce monolith to 21+ distributed microservices using Golang & DDD. Explore Kratos architecture, Saga patterns, an…
Logger System LLD (Java)
Problem Statement Design a Logger Framework that supports: Multiple Log Levels DEBUG INFO WARN ERROR FATAL Multiple Output Destinations Console File D…
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…
OLTP vs OLAP : Understanding the Foundation of Modern Data Systems
Introduction Every business relies on data, but not all data workloads are the same. Processing a customer's payment, booking a flight, or updating in…
When a Static Website Isn’t Enough: Building an Open Source Intelligence Platform
The Architecture Decisions That Turned a Static Website into an Open Source Intelligence Platform Open source organizations grow in a very... interest…
The Hidden Cost of Multi-Model Workflows
The AI race is quietly changing Months ago, most discussions revolved around one question: "Which model is the smartest?" Today, I'm seeing a differen…
title: Day 4 of 30: Load Balancing and the Single Point of Failure Problem
Day 1: the big picture. Day 2: databases. Day 3: caching, and how it's really a consistency problem in disguise. Today: load balancing — how traffic a…
There Is No "Now" in Distributed Systems
Ask your two services what time it is. They'll give you different answers. Both will be wrong. The Relativity Problem In 1905, Einstein published spec…
Toward an AI Operating System: Context Engineering as the First Runtime Primitive
After publishing the first few posts about ai-assistant-dot-files , the obvious next question is: Where does this go? The tempting answer is "more age…
Why Event-Driven Architecture Isn’t About Speed (and When You Actually Need It)
We’ve all seen it happen. A engineering team wants to feel like they belong in the "cool kids" club, so they grab Apache Kafka or a massive event brok…
Payment Systems Architecture — From Laravel Integrator to Staff-Level Architect
This guide takes you from "I integrate HyperPay/Paymob/Stripe webhooks" to "I can design the payment infrastructure of a fintech company." It's writte…
Generating a Live Recap Before the Match Ends: Why Real-Time Recaps Are Hard
A highlight reel is a sequence of moments. A recap is a story. Producing a recap automatically while a match is still being played is a different and …
The Difference Between Retry and Idempotency They're Not the Same
Let me start with the confusion that prompted this post: in a recent mentoring session, a senior engineer described their payment service as "idempote…