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Every metric
breaks eventually.
Real companies, real systems, real thresholds crossed. Each row is an engineering migration retold as the incident it actually was — what climbed, what broke, what they shipped instead. Facts traced to source, never altered.
3Migrations logged
8Tech categories
7yYears covered
SHIPPED
Enzyme ⟶ React Testing Library (RTL) Airbnb Airbnb used an LLM-driven pipeline to migrate 3.5K React test files from Enzyme to RTL in 6 weeks instead of an estimated 1.5 years.
2024
SHIPPED Python 2 ⟶ Go Khan Academy How an end-of-life deadline turned into a full backend rewrite
2021
RESOLVED MongoDB ⟶ Cassandra Discord How Discord rebuilt message storage before MongoDB's single replica set hit its limit
2017
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