Designing a Distributed Cache Inspired by The Lord of the Rings: One Insight to Rule Them All
The Quest Begins (The "Why") Ever felt like your application is constantly begging the database for the same piece of data over and over? I remember…
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Freshness Watermarks Belong on Every Row, Not the README
The most common freshness design I see — in my own old code included — is a single stamp at the top: a README that says "last updated 2026-10-01", a…
Using the Strangler Pattern to Add AI Around Legacy Systems Without Rewriting the Core
A legacy system can contain years of business rules, data relationships, and operational behavior that nobody wants to rediscover during a full rewr…
Caching Strategies: 8 Patterns Every Engineer Should Know
The fastest way to produce a shallow system design: saying "I'll add Redis for caching" and stopping there. Naming "Redis" without explaining what y…
Horizontal Scaling Series — Part 1: MinIO and Shared Object Storage
When we horizontally scale an application, adding more instances is only part of the solution. We also need to consider where the application stores…
From Open Data to Coordinated Models: An Architecture-Level Review of Shapezo, MicroStation, ArchShaper, CityWeft, and HalfMaps
Tool comparisons usually describe features. Architects of software read them differently: what computes locally, what runs in the cloud, where the a…
Rate Limiting Like Gandalf: Building a Distributed Cache with Redis
The Quest Begins (The "Why") Ever had your API melt down because a sudden traffic spike hammered every endpoint at once? I remember a late‑night dep…
Building Inventory Applications That Don’t Lose Track Of Their Inventory
Let’s imagine we have an inventory system. Two of its customers decide to order the last remaining unit of a given product at roughly the same time.…
Indexing and Replication Through a Restaurant Example
Let's continue our café story, but now imagine the café has become a popular restaurant with thousands of customers, hundreds of menu items, and a l…
Why I Built an Interactive Sandbox to Learn Distributed Systems
When you first start studying system design and distributed systems, almost everything is taught through static boxes and arrows. Someone draws a Lo…
Designing Contextual Learning Recommendations for Language Learners
Recommendation systems in education should not optimize for clicks alone. A learner may enjoy a video without learning from it, complete many exerci…
How to Prevent Retry Storms in Microservices
Quick Answer: A retry storm occurs when deeply nested microservices independently retry failed downstream requests, causing exponential traffic ampl…
MCP vs A2A vs ACP: Open Protocols for Multi-Agent Systems, Compared
MCP vs A2A vs ACP: Open Protocols for Multi-Agent Systems, Compared If you're building a multi-agent system, you've hit this question: how should ag…
The hard part is not connecting systems. It is predictable behavior.
Connecting systems is the easy part. The hard part is predictable behavior. The same request should do the same thing every time. Edge cases should…
Combining Automated Payment Rails with Human Fallback
Designing one transaction lifecycle that can move safely between API-based payouts and operational fulfillment. Payment coverage is rarely uniform.…
Separating Available, Held, Actual, and Displayed Balances
Why one balance field cannot represent every financial truth in a virtual-account product. “What is the balance?” sounds like a simple question unti…
Building a Provider-Agnostic Payout Architecture
Keeping the customer experience stable while payment rails, bank directories, fees, and status semantics change underneath it. The first integration…
Reconciling Payments When Webhooks Never Arrive
Designing a recovery path for asynchronous transactions that remain stuck in processing. Webhooks provide a fast way to learn that an external payme…
Building an Asset Tracking System That Turns Events Into Actions published: true tags: architecture, iot, backend, systemdesign
Asset tracking sounds simple on paper: figure out what a thing is and where it is. Then you add a second location, a third device type, and a wareho…
A prototype AI agent can survive on a static CSV and a single Python script. A production agent cannot.
I recently completed the AI-Assisted Data Science with BigQuery lab via Google Cloud. While analyzing the final multimodal vector search stage, I fo…
Group Chat Orchestration: Why Eleven Agents Spent Forty Minutes Debating a Research Summary
Group chat orchestration is the default pattern for multi-agent systems. It mirrors how human teams work: agents share a conversation, a moderator p…
How to Build Transportation Management Solutions Around Real-Time Inventory Events
A warehouse can show 500 units available while the transportation system is still waiting for the previous stock update. That inconsistency can caus…
System Design for Beginners: Vertical Scaling vs Horizontal Scaling
If you are preparing for software engineering interviews, you have probably heard the term System Design many times. But what does it actually mean?…
Treat Sales Handoffs as Explicit Workflow States
Treat Sales Handoffs as Explicit Workflow States A sales workflow should not treat “notification sent” as equivalent to “owner accepted.” Those are…
Building a Real-Time Notification System at Scale: The Gandalf Approach
The Quest Begins (The "Why") I still remember the first time our notification service started to feel like a dragon hoarding gold. We were pushing o…
The First Architecture Draft
I had the product definition, user stories, and backlog. Now it was time to design the system. I started with the main responsibilities of Second-Me…
Hey all..
I’m Darshan, a software engineer, founder and builder from India. I spend most of my time building products, experimenting with AI, automating thing…
I built a system design app that teaches why and helps you in interviews
SysDesign Studio is an open-source, interactive way to practice system design interviews. Evolve architectures step by step, trace failure paths, an…
ForgeZero and Gloria: Build Tooling for People Who Still Want to Know What Their CPU Is Doing
I'm Alex Voste, the person behind ForgeZero and its resident experimental language, Gloria. I'm not going to open with a mission statement. I'm goin…
Designing Explicit State Machines for Money Movement
Turning scattered status updates into enforceable payment lifecycle rules. Payment systems often begin with a status column and a few convenient val…