Better test environments with "replay" of production traffic that I can easily hack on locally. Right now, we have some very robust tests. But getting all the containers into the right state can sometimes be a pain. Every now and then, you nuke the entire setup from orbit and re-spin everything back up. But this is still all artificial data in the tests. We spend too much time making a robust test environment when, if we could just say "make this like prod but with my binary in place of this other one and let me replay traffic to simulate a bug or load or whatnot" and to allow this to have a very, very tight loop. In the order of seconds between saving a change (maybe an added log line) and hitting the change with simulated traffic.