My first thought was Athena as well, but it could be Quartz (it started in 08-09 at BaML, vs Athena starting in 2006).
Both Citi and Barcap also tried (albeit to less success than JPM/BaML) to do similar things.
With that said, For those unfamiliar - at least two major banks run insanely large production python installs across thousands of developers. Core skills (nowadays) are python and react - and yes, we’re all actively hiring :)
All of the large banks also have pretty good open source initiatives - just check out github repos for JPMorgan, BaML, or GS. We have also been active participants in Pycon (key sponsors and doing sessions, like Steve’s) since at least 2009.