> which one was more pleasant to write? Did java allow for iterating quicker? Java. And I'm a career C++ programmer. The whole system was built to be event d

> which one was more pleasant to write? Did java allow for iterating quicker? Java. And I'm a career C++ programmer. The whole system was built to be event driven (messaging) from the ground up too. It had a lot of benefits like performance testing code without instrumentation, the whole junit/mockito ecosystem, code completion in Intellij that actually worked. You only had to worry about code errors, not linker errors. We had over 100,000 unit tests. We leveraged the whole JVM and ecosystem too. Outside of the hot path code, we could just go and use json libraries, webservers, and so on. In C++ we'd be struggling (not so much these days), to throw together a JSON/REST/ws webserver in the same code base. Though Java always feels like to trying to unwrap a present whilst wearing mittens. It's excessively verbose. We didn't pick Kotlin as at the time as that was known to emit various extra byte code for seemingly trivial calls, and was only on v1.0 at the time.