# Why Legacy Code Turns Small Changes Into Multi-Day Firefighting

DevFeed: [Why Legacy Code Turns Small Changes Into Multi-Day Firefighting](<https://devfeed.tech/articles/you-didn-t-become-a-senior-dev-to-firefight-26195.md>)

Original publisher: [Read original article](<https://journal.optivem.com/p/you-didnt-become-a-senior-dev-to-firefight>)

Author: Valentina Jemuović

Published: 2026-06-30T06:02:36Z

Content type: opinion

Language: en

Sources: [Optivem Journal](<https://devfeed.tech/sources/optivem-journal.md>)

Topics: [legacy](<https://devfeed.tech/topics/legacy.md>), [Test-driven development](<https://devfeed.tech/topics/tdd.md>), [Development](<https://devfeed.tech/topics/development.md>), [Software](<https://devfeed.tech/topics/software.md>)

Tags: [dev](<https://devfeed.tech/tags/dev.md>), [engineering](<https://devfeed.tech/tags/engineering.md>), [legacy-code](<https://devfeed.tech/tags/legacy-code.md>), [tdd](<https://devfeed.tech/tags/tdd.md>)

## AI overview

This commentary examines how legacy code can turn a small change into days of investigation and risk. It argues that tangled dependencies, missing tests, and outdated code prevent senior developers from improving architecture and make routine maintenance frustrating.

## Source excerpt

The field took twenty minutes. Everything around it took three days.