This was around 2021 so AI code tools had not yet eaten everyone. One of the most interesting challenges was finding the right value judgements when blending multiple type systems. I doubt any agentic coding tool could do it today.

I blended the python type system with a large low-level type system (STEP AIM low level types) and a smaller set of higher-level types (STEP ARM, similar to a database view). I already was familiar with STEP, so I needed to really grok what Python was doing under the covers because I needed to virtualize the STEP ARM and AIM access while making it look like "normal" Python.