Systems Design & Architecture

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It’s 4:55 PM on a Friday. Your marketing lead drops a message: “The holiday banner is wrong. It...

You upgrade TanStack Query to v5. Your app builds. Tests pass. You open the dashboard and every...

The Invoice — Episode 19 "mTLS, observability, traffic management, zero-code retries. You need a...

Sleeping Barber Problem The sleeping barber problem is a classic concurrency problem...

Java LLD: Designing a Scalable Job Scheduler Without Busy Polling In my time at companies...

Building Figma-like real-time collaboration for your app? Stop fighting Redux/Zustand. We built...

Lessons from 14 years of building backend systems and a decade underwater — and why the physics of failure is the same in both worlds.

When you connect real systems - ERPs, APIs, AI workflows - things don’t behave cleanly. Requests...

I've spent the past few weeks going deep on Unix and Linux systems programming — reading TLPI,...

The scene this week In the span of 48 hours in late April 2026, four of the largest...

Building distributed systems in Python? Here is how python-cqrs tackles consistency with orchestrated...

Image quality gets discussed a lot in document systems, but usually as a front-end technical concern:...

A lot of document workflows have an exception queue. Far fewer have an exception taxonomy. That...

I've had this conversation too many times. A developer joins a project, looks at the architecture,...

Building the Backend for a Spatial Memory Network: Lessons from the Trenches Alright,...

"Good code is not written. It's designed." OOP is how you design it. What Even Is...

A first-time introduction to Virtual Frame — what it is, why it exists, and how it composes...

I’ve been working on a domain-specific language for a point-and-click framework called Escoria built...

“Performance is not a feature - it’s the foundation. Next.js gives you the tools to build it...

Building Document Management Systems for International Legal Workflows As a developer, you...

This post is part of the series The True Code of Production Systems. The first time you add...

Want to turn your architecture docs into visual gold? With the new Mermaid.js architecture diagram...

TL;DR: I've spent 5+ years building diagram-heavy apps with GoJS. Recently I built an org chart...

Ever wondered what actually happens when you open a website Every time you open a website, a...

Hey dev community! 👋 We’re new here and glad to be part of this space. At World Business Software...

If you've ever started a new B2B SaaS project, you know the drill. Before you write a single line of...

Read-Only MCP Removes a Failure Class, But Only if the Whole Tool Boundary Is Actually...

Most diagram tools ask you to make a decision before you even start: Do you want a flowchart?...

Why complexity isn’t always the problem Complexity is often seen as something to...

TL;DR The classic components/hooks/utils structure often breaks down as the codebase and...

Every developer writes code. But the ones who grow fastest aren’t just writing features—they’re...

The backbone of any well-functioning application is its database. Whether you're a seasoned developer...

A resilient cloud native app built using Domain Driven Design and Microservice Architecture on...

AI models assess authority based on clarity of expertise, consistency of entity data, depth of...

Every data engineer eventually ends up staring at a problem that shouldn't exist. Data that needs to...

Welcome to Part 8 of the Flutter Interview Questions series! In this installment, we dive deep into...

Welcome to Part 7 of the Flutter Interview Questions series! This is one of the most technically...

How a carefully layered architecture delivers instant offline access, end-to-end privacy, and...

Welcome to Part 6 of the Flutter Interview Questions 2025 series! This part dives into advanced...

Em sistemas distribuídos, contar algo corretamente é mais difícil do que parece. Dois processos lendo...

Unmanned Missions: Serverless Functions and Containers on Scaleway “Thunderbird 3 can...

Welcome to Part 5 of the Flutter Interview Questions series! This part focuses on the architectural...

When people write books about distributed systems, one of the first temptations is: “I want to...

Welcome to Part 4 of the Flutter Interview Questions series! This installment dives deep into three...

Welcome to Part 3 of the Flutter Interview Questions series! State management is arguably the most...

Kafka Crash Course: From Concept to a Hands-On Python Project Have you ever wondered how giant...

Part 2 — Architecture, MVI, and the Offline-First Decision In Part 1 I wrote about the...