Writing original software. For example: building a new tool from scratch to solve a valid problem that real people have. Most developers cannot do that without

Writing original software. For example: building a new tool from scratch to solve a valid problem that real people have. Most developers cannot do that without tremendous help and a bunch completely unnecessary abstractions. Measuring things. For example determining performance harms and improvements from new features or determining trend shifts during a defined duration. Accessibility, security, transmission, and operations. Requirements analysis. Visual design, user experience, and information architecture. I mean actual product design and not just using a tool/framework to put text on screen.