> I saw my colleagues again and again implementing basic algorithms such as rolling median, or finding a maximum. Instead of loading data into Pandas and doing a group by, they would create some kind of loopy solution that would use maps.

Isn’t this trivial? I use these functionalities and maintain my own Go package for such utilities. A software firm should be able to do this without much issue. In fact, it is better done in house. Don’t have to worry about dependency management and downloading the entire Pandas library for just rolling means, etc.