Anything interesting and server-based usually depends on an entire complex data pipeline (one system for this if you’re lucky) and a dozen or more external systems with no great way to mock them that won’t itself be out-of-sync with reality often, anyway.
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Anything interesting and server-based usually depends on an entire complex data pipeline (one system for this if you’re lucky) and a dozen or more external systems with no great way to mock them that won’t itself be out-of-sync with reality often, anyway.
I once heard Facebook uses production database to develop and test new feature because anything else was unfeasable. Even a smaller copy of it.
I'd love to have a confirmation from someone at Meta.
edit: found an amazing discussion about their release process here: https://news.ycombinator.com/item?id=30899362