How is client logic support for different languages designed in your project? Some time ago I found Kafka clients for several languages are pretty much unusable

How is client logic support for different languages designed in your project? Some time ago I found Kafka clients for several languages are pretty much unusable due to bugs and/or performance non-debuggability. The reason, I think, was that the client logic is quite complex and each client project had to re-implement it from scratch (or use some C FFI monstrosity - which was pretty much a dead end too).