Very interesting overview of how PythonLanguage systems look in BigFinance
Doesn't entirely surprise me.
The pattern of everything around a single database
Which is not relational but primitive table based
Some ideas look familiar to me from when I used CacheObjectScript in enterprise software. In Intersystems' version of MUMPS even source code is in the db
Some I can kind of infer from ClojureLanguage (built for Datomic, used in banks)