How a 17000 Line Python Codebase Broke in Production

A SaaS company's 17,000-line Python monolith crashed under 400 concurrent users on a Tuesday morning. Lucas and Luna walk through the real root cause: a single mutable default argument in a request handler that silently corrupted session state for hours before cascading into a full database connection pool exhaustion. They trace the bug from stack trace to fix, compare how Rust and Go would have caught it at compile time, and debate whether modern Python tooling like Pydantic v2 and mypy strict mode could have prevented the outage. The episode closes with a practical checklist for teams running Python in production today.

#Python #Debugging #ProductionOutage #MutableDefaultArguments #SaaS #Pydantic #Mypy #TypeSafety #Rust #Go #SoftwareEngineering #CodeReview #TechOps #Backend #Programming #FexingoBusiness #BusinessPodcast #Technology

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