I still remember discovering & using numba for the first time in university. At the time I didn't know any programming languages except for Python, and wasn't super great at Python either. We had to write and run molecular simulations for our numerical methods and simulations class, and people were writing their code in C/C++ and were blazing through it. I remember finding out about Numba through the High Performance Python O'Reilly book, and by just adding a single @jit decorator, my simulations were dramatically faster.

Amazing stuff, honestly felt like black magic at the time.