We Trusted Auto-Ack. The Queue Agreed. Our Costs Didn't.
Most async bugs announce themselves. This one didn't. No failed jobs. No customer complaints. No error logs. Just infrastructure costs climbing steadi…
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The First Brick on the Walled Garden — Rethinking e-Food Delivery as an Open Protocol
E-food delivery is a trillion-dollar market . And most of that trillion is not going to farmers, store owners, or the people who actually move food ar…
Inside Uber's Architecture: Engineering Decisions That Power Millions of Rides Every Day
Why Study Real-World Architectures? Most system design discussions focus on theoretical architectures that work well on whiteboards. Real-world system…
I Built a Complete AI Infrastructure Stack from Scratch — Here's What I Learned
I Built a Complete AI Infrastructure Stack from Scratch — Here's What I Learned Most AI projects start at the top of the stack. You grab an LLM API, w…
Why Distributed Transactions Fail and How the Outbox Pattern Helps
While covering the Outbox Pattern in my earlier article on CQRS , I realized there was much more depth to it than I initially planned to discuss — and…
Beyond the Cheat Sheets: How to Actually Reason About Partitioning VS Sharding in System Design Interview
You are mid-way through a system design interview, confidently whiteboarding your database architecture. You casually drop the word: “…and then we’ll …
Why We Accidentally Blocked Our Users: A Deep Dive into Idempotency in Distributed Systems
I learned one of my most important distributed-systems lessons the hard way. We were working on a payment flow connected to an external payment gatewa…
Read-Modify-Write isolation in NoSQL: the distributed-lock hell.
In part 1 , the single-document case was easy. In part 2 , two documents brought Write Skew, and we saw that even a native ACID transaction — snapshot…
Retrying HTTP Requests in Go Without Making It Worse
When you call an external API, things go fine until they don't. A network blip, a server restart, a rate limit. So you add a retry, and most of the ti…
CQRS: Where It Helps and Where It Hurts in Backend Systems
CQRS has been one of the most talked-about architectural patterns in modern backend systems. Over the last decade, its popularity has grown alongside …
Minimal Code Doesn’t Mean Stable Code
The argument sounds reasonable: fewer lines of code mean fewer bugs. Simpler to review, easier to reason about, less surface area for defects. Sounds …
Designing TikTok from Scratch — A System Design Deep Dive
Who is this for? Mid-to-senior engineers preparing for system design interviews, or anyone curious how a short-video platform at billion-user scale ac…
Building TaskForge: Translating Enterprise Chaos into an Open-Source Scheduler
If you build enterprise software, you know the pain: you spend months solving complex architectural challenges, navigating network partitions, and bui…
19/30 Days System Design Questions!
Your checkout endpoint has a 400ms P95. Profiling shows 70% of that is DB reads. You add a read replica and point all SELECT queries at it. P95 drops …
Multi-tenant PostgreSQL: row-level security vs schema-per-tenant & when to use which
If you're building a multi-tenant SaaS, this is the first real architecture decision that will haunt you if you get it wrong. I've implemented both ap…
Observability in 2026: Distributed Tracing Replaced Logs, and OpenTelemetry Won
Observability in 2026: Distributed Tracing Replaced Logs, and OpenTelemetry Won The observability landscape in 2026 looks nothing like 2020. Logs are …
Part 1: Taming Asynchronous JavaScript: How to Build a "Mailbox" Queue
Have you ever tried to catch water from a fire hydrant with a paper cup? That is exactly what it feels like when you are building a JavaScript app and…
1/30 Days System Design Question
our mobile app talks to 3 backend services directly. A 4th one ships next sprint. The mobile team is already drowning. Every new service means a new d…
Kafka's Real Compression Problem Is Batch Depth
Kafka compression waste is usually a batch depth problem, not a codec problem. Better batching improves producer compression, which reduces consumer C…
Coordinating 100+ AI Agents in the Field: Practical Patterns for Robotic Swarms
Introduction We shipped our first 10-robot demo and thought the hard part was solved. Here’s what we learned the hard way when we moved to hundreds of…
This “cyberphysical engine” replaces the traditional virtual machine with wavefront propagation
Screenshot demonstrates the hologram resolution of 100 x 100, recording and restoring the object wireframe cube with 80 glowing dots on edges, with Fr…
We Stopped Using Microservices. Here Is What We Learned.
We Stopped Using Microservices. Here Is What We Learned. Two years ago we split our monolith into 12 microservices. Eighteen months ago we merged five…
Welcome to the Distributed Systems World — The Challenges Nobody Warned You About
title: "Welcome to the Distributed Systems World — The Challenges Nobody Warned You About" published: false description: A friendly tour of the six bi…
What Broke When We Hit 100k WebSocket Connections (And How Realtime Orchestration Saved Us)
Introduction We built a product that streams AI model outputs to browsers and backend agents in realtime. At first, a few hundred WebSocket connection…
What Broke After 10M WebSocket Events (And How We Fixed Our Realtime AI Orchestration)
Introduction We built a realtime AI feature for a multi-tenant SaaS: live agent assistants that coordinate across services and update UIs via WebSocke…
Your Inventory Counter Just Went Negative. Here’s Why — and How to Fix It.
Black Friday. 9:02am. Your e-commerce platform has been live for two minutes. A limited-edition sneaker drops - 500 pairs in stock. Within seconds, th…
What Broke After 10M WebSocket Events (And How We Rewired Our Realtime AI Pipeline)
Introduction We hit a wall after about 10 million WebSocket events in a month. Latency spikes, dropped messages, and opaque failures started showing u…
The Illusion of Scale, Part 2: When Your Data Model Becomes Your Bottleneck
I want to talk about the cruelest kind of technical debt. Not the kind where someone wrote bad code, and you can see it. The kind where the code is cl…
What Broke After 10M WebSocket Events (And How We Fixed Our Realtime AI Orchestration)
Introduction We hit a hard wall when our realtime AI feature started processing millions of small events per day. Latency spiked, connection churn inc…
Distributed Lock Alternatives: 3 Methods Every System Architect
When building distributed systems or breaking down an existing monolithic system, managing concurrently accessed shared resources has always been a he…