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What are your experiences with mono repos?
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We use them at Meta. It's easier to interact with other parts of the codebase, but it doesn't play well with libraries so you end up redoing a lot of stuff in-house.
I would only recommend a monorepo if you're a company with at least 5,000+ engineers and can dedicate significant time to internal infra.
It's funny because at least one FANG does not use monorepos and has no problem with them, in spite of being at the same scale or even perhaps larger than Facebook.
I wonder why anyone would feel compelled to suggest adopting a monorepo in a setting that makes them far harder to use and maintain.
Is it Amazon because they did a really good job at keeping teams separate (via APIs)?
I don't think they did an exceptional job keeping teams separated. In fact, I think monorepos only end up artificially tying teams down with an arbitrary and completely unnecessary constraint.
Also, not all work is services.