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…
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 /…
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…
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…
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…
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…
Why Timestamps Lie in Distributed Systems (and How Logical Clocks Fix It)
There's a line of code in almost every service that stores replicated data: def resolve ( incoming , stored ): # keep whichever write is "newer" ret…
Circuit Breaker Pattern
One-liner: A circuit breaker stops calling a failing service to give it time to recover — instead of hammering it with requests that are guaranteed…
Building Faultline: A Reusable Chaos-Injection and Linearizability-Checking Harness
Building Faultline: A Reusable Chaos-Injection and Linearizability-Checking Harness Faultline is an open-source Go harness that injects faults into…
The Retry That Restored Access
Retries keep distributed systems moving through timeouts and temporary failures. In an access system, though, an old retry can be more dangerous tha…
Metrice: Zero-dependency post-quantum P2P mesh network
Metrice is a decentralized peer-to-peer (P2P) mesh networking protocol engineered with zero external npm dependencies (Zero-Dependency), running nat…
Hello DEV! SRE here..👋
Hello, DEV 👋 After spending years working in Site Reliability and Platform Engineering , I figured it was finally time to start writing about the th…
Keeping a Legacy Cache Consistent During an Incremental Migration
During an incremental system migration, I ran into a subtle consistency problem: our new service could successfully update the database while the le…