I made my own application on the topic of express freight delivery. The application has the following functionality:
accounting of clients of the company
accounting for shipping orders
accounting for tariffs for cargo delivery
accounting of tariff zones;
shipping cost calculation (delivery rate = price per 1 kg x cargo weight + checkout cost + commission amount, which = = 0.5% x declared value of cargo)
I choose .Net because I think that it is a creative profession, I hope for an internship with further employment in your company.