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How One Engineer Refactored a 10 Year Old Codebase in Six Weeks episode artwork

EPISODE · Jun 5, 2026 · 9 MIN

How One Engineer Refactored a 10 Year Old Codebase in Six Weeks

from The Software Engineering Podcast with Fexingo: Code, Architecture, and Engineering Best Practices · host Fexingo

Episode 33 of The Software Engineering Podcast with Fexingo. Lucas and Luna dive into the story of a senior engineer who inherited a monolithic ten-year-old codebase with zero tests and a single deployment causing multi-hour outages. Over six weeks, they systematically added integration tests, extracted domain modules, and built a CI pipeline that cut deployment failures by 90 percent. The episode focuses on the practical first steps: the decision to start with a single endpoint, the use of characterization tests to capture existing behavior, and the trade-off between perfect abstraction and incremental improvement. No hot takes – just the concrete tactics that turned a legacy nightmare into a deployable system. #LegacyCodebase #Refactoring #IntegrationTesting #CI #CharacterizationTests #IncrementalImprovement #SoftwareEngineering #CodeArchitecture #BestPractices #TechnicalDebt #DeploymentPipeline #TestingStrategy #ModuleExtraction #SeniorEngineer #FexingoBusiness #BusinessPodcast #Technology #Episode33 Keep every episode free: buymeacoffee.com/fexingo

Episode metadata supplied by the publisher feed · Published Jun 5, 2026

What this episode covers

Episode 33 of The Software Engineering Podcast with Fexingo. Lucas and Luna dive into the story of a senior engineer who inherited a monolithic ten-year-old codebase with zero tests and a single deployment causing multi-hour outages. Over six weeks, they systematically added integration tests, extracted domain modules, and built a CI pipeline that cut deployment failures by 90 percent. The episode focuses on the practical first steps: the decision to start with a single endpoint, the use of characterization tests to capture existing behavior, and the trade-off between perfect abstraction and incremental improvement. No hot takes – just the concrete tactics that turned a legacy nightmare into a deployable system. #LegacyCodebase #Refactoring #IntegrationTesting #CI #CharacterizationTests #IncrementalImprovement #SoftwareEngineering #CodeArchitecture #BestPractices #TechnicalDebt #DeploymentPipeline #TestingStrategy #ModuleExtraction #SeniorEngineer #FexingoBusiness #BusinessPodcast #Technology #Episode33 Keep every episode free: buymeacoffee.com/fexingo

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Frequently Asked Questions

How long is this episode of The Software Engineering Podcast with Fexingo: Code, Architecture, and Engineering Best Practices?

This episode is 9 minutes long.

When was this The Software Engineering Podcast with Fexingo: Code, Architecture, and Engineering Best Practices episode published?

This episode was published on June 5, 2026.

What is this episode about?

Episode 33 of The Software Engineering Podcast with Fexingo. Lucas and Luna dive into the story of a senior engineer who inherited a monolithic ten-year-old codebase with zero tests and a single deployment causing multi-hour outages. Over six weeks,...

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