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Google avoids it by sticking to a limited set of languages. I don't work at Google, so I can't claim to know what their architecture looks like in terms of blending languages within applications. But the act of limiting languages does not in itself preclude polyglot programming. Choosing to limit yourself to one language, or one language per application, would do so. Likewise, choosing C# and Java as your languages would probably nullify most of the benefits. But the point is, just because you allow or encourage polyglot programming does not mean you let everyone choose whatever language suits them and then throw it all together in a melting pot, praying that everything works well together. You can have a method to sort out the madness.