The great SOA migration
summary
Claim: Uber migrates a ~300,000-line Python monolith into over 1,000 microservices across five years, trading monolith slowdowns and four-hour deploys for distributed integration complexity. Migration uses a rope bridge approach: extract one service, run shadow writes and compare reads, then reverse-shadow with feature flags. Scale tooling includes an API gateway at the edge, service auth, RPC libraries, and moving toward an event bus; production-friendly testing uses tenancies to simulate external side effects without charging cards.
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