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Tons of stuff is still built on the JVM. The big five tech companies (besides MS) use Java nearly exclusively for back end development. Python is good for ML and data crunching, but compared to Java it's dog slow.

Go is definitely catching on but nowhere near passing Java, maybe it will someday

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The big 5 tech companies are Apple, Microsoft, Google, Facebook, and Amazon.

Neither Apple nor Microsoft use Java.

Facebook uses PHP, Google uses a lot of languages but mostly C++ for Search. Amazon does seem to use a lot of Java.

> Neither Apple nor Microsoft use Java.

From what I understand Apple uses java/scala fairly extensively for backend services.

And they also run portions of iCloud on Azure using .NET.

They run portions on Azure. That doesn't mean they are using .Net. Azure supports more than .Net.

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