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Six years ago, Twitter was experiencing outages due to high traffic. Back in 2010 Twitter was built as a monolithic Ruby on Rails application. Twitter migrated to a microservices architecture to fix these problems. During this migration, the engineers at Twitter learned how to build and scale highly distributed microservice architectures.
William Morgan was an engineer at Twitter during that time, and he is now the CEO of Buoyant.io, a company building open-source microservices infrastructure. Some of the big problems at Twitter were solved at the communication layer, using an RPC library called Finagle. At Buoyant, those lessons are being applied to a project called Linkerd, an RPC proxy.