[far33d]

Hard problems are everywhere. Every company, every app, every product has unique and difficult problems to solve.

Sometimes those problems are with product design and UX. Sometimes those problems are mathematical. If you are successful, often they have to do with scalability and reliability. If you work with great people there are always hard problems in enabling productivity and building great tools. Many companies have serious and significant challenges around security and may not even know it. If most companies are solving simple problems, then why aren't most companies automatically successful?

If you broaden your definitions of "hard" you might find that there are many things that qualify. If what you mean is "hard mathematical problems" then yes, you will have to learn some math.