What about the tests?
This is crypto-currency, the hot new thing tests are for old fogeys who still use dollars. Get with the times, young programmers are Agile, they don't plan and test their work, they release early and often. They release the Minimum Viable Product (minimum piece of shit they can get away with for a moment), it's illegal now to even think about corner cases and make code robust.
I don't know about ZCash, but Bitcoin has an extensive regression test suite and test mode. And test-first development is a principle of agile, so I'm not sure why you concluded agile programmers don't test.