You gotta think of a roof like a solid code base. First you lay a good foundation—those are your core libraries and data structures. Then you frame the walls, that’s the architecture: classes, modules, the big picture. The nails and fasteners are the small functions and tests that hold everything together. Just like a roof needs proper drainage and ventilation, your code needs error handling and logging so problems don’t build up. And if you put in a bit of redundancy—like a spare shingle or a backup function—you’ll keep the whole thing standing strong when something goes wrong. Keep it simple, keep it tight, and don’t cut corners. That's how you build both a roof and a program that lasts.