Why Your API Backwards Compatibility Breaks More Than You Think

from The Developer Tools Podcast with Fexingo: APIs, Infrastructure, and Software for Engineers · host Fexingo

Episode 14 of The Developer Tools Podcast: Lucas and Luna dig into why the biggest API compatibility problem isn't your versioning scheme—it's the hidden dependencies in client code. Using the 2021 Fastly outage as a concrete case, they unpack how one deprecated field caused cascading failures, and why 'don't break the contract' is harder than it sounds. They discuss practical strategies like semantic versioning for APIs, additive-only changes, and why your SDK wrapper might be your weakest link. No fluff, just a focused look at how to stop breaking your users without freezing your product roadmap. #APICompatibility #BackwardsCompatibility #FastlyOutage #SemanticVersioning #SDKWrappers #DeveloperExperience #APIVersioning #TechDebt #ProductionIncidents #InfrastructureEngineering #BusinessAndTechnology #DeveloperTools #FexingoBusiness #BusinessPodcast #DevOps #SoftwareEngineering #APIDesign #ReliabilityEngineering Keep every episode free: buymeacoffee.com/fexingo

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This episode is 8 minutes long.

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This episode was published on May 27, 2026.

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