I think problems are hard when you are new to a domain. After you get some practice, nothing there is really that hard. For me, the first hard thing was imple

I think problems are hard when you are new to a domain. After you get some practice, nothing there is really that hard. For me, the first hard thing was implementing this https://en.wikipedia.org/wiki/Dead-end_elimination#Generalizations https://en.wikipedia.org/wiki/Dead-end_elimination#Generaliz... Probably because it was the first algorithm I implemented with no reference implementation to look at. The second hardest was a high performance proxy that can redirect to another proxy and can collect specific types of non-encrypted data.