# Event-Driven Systems Are Easy to Build but Hard to Keep Correct

DevFeed: [Event-Driven Systems Are Easy to Build but Hard to Keep Correct](<https://devfeed.tech/articles/event-driven-systems-are-easy-to-build-but-hard-to-keep-correct-17953.md>)

Original publisher: [Read original article](<https://newsletter.systemdesignclassroom.com/p/event-driven-systems-are-easy-to-build-but-hard-to-keep-correct>)

Author: Raul Junco

Published: 2026-04-25T11:52:06Z

Content type: article

Language: en

Sources: [System Design Classroom](<https://devfeed.tech/sources/system-design-classroom.md>)

Topics: [event driven](<https://devfeed.tech/topics/event-driven.md>), [distributed-systems](<https://devfeed.tech/topics/distributed-systems.md>), [Software Engineering](<https://devfeed.tech/topics/software-engineering.md>)

Tags: [bugs](<https://devfeed.tech/tags/bugs.md>), [distributed-systems](<https://devfeed.tech/tags/distributed-systems.md>), [event-driven](<https://devfeed.tech/tags/event-driven.md>), [schema](<https://devfeed.tech/tags/schema.md>), [systems](<https://devfeed.tech/tags/systems.md>)

## AI overview

This article explains that event-driven systems can appear operationally healthy while producing incorrect business outcomes. It focuses on correctness failures caused by duplicate delivery, ordering gaps, dual writes, retries, and schema drift.

## Source excerpt

4 ways event-driven systems fail without looking broken