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Yes heterogeneous systems are much easier to deal with, although from experience certain systems are a pig to deal with from end to end (anything Microsoft as a rule).

Different languages are just different forms of integration and the mantra of integration is hell should be in the forefront of everyone's mind, always.

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Depends on tools you use, I found Apache Thrift and Protobuf pretty to be sophisticated tools for integration between services.

Yet they are still entirely impractical for what we do. There is no one size fits all methodology which results in a heterogeneous communication layer. This means that you end up with technology fragmentation and therefore additional complexity.

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