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…
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Idempotency keys done right: exactly-once effects over at-least-once networks
Why "just retry" creates duplicate payments, and a PostgreSQL-backed design for idempotency keys that survives double clicks, timeouts, crashes and…
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…
Vector Clocks, Explained With a Budget
In short: When the same data is edited on several devices, "keep the newest" is unreliable, because device clocks disagree and messages arrive late.…
ZooKeeper Information Disclosure: Existence Watches Leak Restricted Znode Names
ZooKeeper Information Disclosure: Existence Watches Leak Restricted Znode Names Summary Among the four Apache ZooKeeper flaws fixed in September 202…
Why Industrial Edge Gateways Need Store-and-Forward
Why Industrial Edge Gateways Need Store-and-Forward Many teams still treat an industrial edge gateway as a simple protocol bridge: collect data from…
The outbox pattern without a relay
Work on a distributed system long enough and you'll know the particular cold sweat of the dual write. You insert an order into the database and the…
Trace log #3: Tracing one alert through Alert manager
The signal problem I was trying to understand how mature systems separate signal from noise when many alerts arrive at once. I had been working thro…
Credits without a mutable token: reservations, idempotency and receipts
The first three parts of this series covered authority: who may do what, on whose behalf, and who decides. This last part covers money. darkedges /…
Building an Agent Trust Fabric: Proof Protocol V3, Ephemeral Keys, and Cryptographic Isolation
Most AI agent frameworks focus on orchestration, prompts, and tool calling. But as autonomous agents gain authority to act in the real world (trigge…
Why you should get the new edition of Designing Data-Intensive Application for Distributed System
A few days ago, I picked up the new edition of Designing Data-Intensive Applications by Martin Kleppmann . I'm still in Chapter 1. The book has been…
Spreader: Your JVM processes are the cluster. Nothing else to install.
Turn plain JVM instances into a cluster that elects a leader, tracks every member and passes messages between them. One dependency, one line of conf…
Split-Brain Needs a Cluster. Mine Happened on One Server.
Today I want to talk about split-brain. The name sounds dramatic, and the problem is dramatic too. One system splits into two halves, and each half…
Building an HDFS-Style Distributed File System in Go
I built a small distributed file system in Go, modeled loosely on HDFS. It has three binaries: a controller that owns metadata: which nodes are aliv…
Every line of my recovery code was correct. It failed every single time."
I run an automated trading system on a paper account. Two pipelines, a handful of small single-purpose agents, no human in the loop once it starts.…
Moving Carefully and Proving It: The Reality of Scaling Fintech Infrastructure
Building backend systems for fintech is fundamentally different from almost any other domain. The stakes are absolute, the edge cases are catastroph…
How to Come Up With the Raft Consensus Algorithm Yourself
If someone asks you to explain Raft, you might hear a list of terms like: Leader election Terms RequestVote AppendEntries Log replication Commit ind…
Deep Dive: Precision Timing Subsystem Modules & IEEE 1588 ArchitectureIn modern distributed computing
Here is a complete, publication-ready Medium article based on the guide to Precision Timing Subsystem Modules and IEEE 1588 architecture.Deep Dive:…
@Cron fires on every replica. I found out the boring way
How an in-process scheduler turned one nightly job into N duplicate writes, and why I moved scheduling out of the app entirely. I was looking at sta…
Idempotent APIs: Complete Guide to Building Reliable and Duplicate-Safe Distributed Systems
Author: Gupta Abhishek Premkumar Published: September 2026 Reading Time: 18 Minutes Tags: API, Distributed Systems, Microservices, Spring Boot, REST…
Building Distributed Systems in Elixir: Part 9 — Backpressure
In the previous part of this series, we built a Publish / Subscribe Broker from scratch. We saw how a central coordinator could fan out events acros…
Cronflower: run a DAG workflow across your cluster, instead of chaining cron jobs
Every team ends up here. One cron job at 02:00 charges the orders. Another at 02:15 ships them, set fifteen minutes later because that's usually lon…
Your Agent's Retry Logic Is an Event-Driven Systems Problem
Most of the event-driven architecture I've built started the same way: a synchronous call chain that worked fine in a demo and fell over under real…
Make Sandbox Epoch a Fencing Token Before Free Compute Vanishes Mid-Write
Here is the event order I use as a paper counterexample when someone treats a free sandbox as durable storage. The planner sends apply_patch , the s…
Transactional Outbox Pattern: Memory Queue for Speed, PostgreSQL for Recovery
In distributed systems, the Transactional Outbox Pattern is a common way to reliably publish events after a database transaction. The idea is simple…
Circuit Breaker Pattern Explained: How to Prevent Cascading Failures in Distributed Systems
Circuit Breaker Pattern What happens when one service fails, but your entire system keeps calling it anyway ? Imagine your payment service is down.…
Why DNS Had to Exist: The Directory Problem Explained From First Principles
The Directory Problem: Why DNS Was Inevitable Software Laws from First Principles — Investigation 009. This picks up directly from Identity ≠ Locati…
I Thought Redis Would Save My API. Just 500 Requests Proved Me Wrong.
As our series continues, Deep-Dive Backend Systems Roadmap. I created the simplest weather API backend, calling the other API to get weather data an…
Distributed Locks
One-liner: A distributed lock ensures that only one node in a cluster can perform a critical operation at a time — preventing race conditions across…
Treating “one day” as a system primitive
For most AI apps, the unit of time is a request. A user sends a message, the model responds, and the workflow ends. Cogweald is designed around a di…