We're doing an AMA on reddit/youtube about deephaven.io right now - I'm personally focused on the realtime streaming side (gRPC with apache arrow flight, http2 into the browser with grpc-web, fall back to websockets when using http1), but also here to discuss python/java data science work.
https://reddit.com/r/IAmA/comments/ud6kqa/hi_we_are_dr_amanda_martin_and_jj_brosnan/
https://www.youtube.com/watch?v=8hmQ9DzTr-g