So, for information: as the program was asked to do more and interface with more (and since the output formatting keep changing every semester), most of the code logic was deported in the configuration files.

Nothing really had any outsized impact in the last 12 months of the project imho. Once the minimum viable product was done, every bit of improvement i did was either simplifying, performance-related or adding more configurability (and test, and documentation).

I did a piece of code that adapted to the ES request that i really like and could be showed off, but it took me three weeks, but 90% of what i parametrized could be hardcoded and it would have changed nothing in the long run.