Not even just the backend! Frontend interactivity itself can be very complicated, and it generally is not fully specified by design (do your design specs come w

Not even just the backend! Frontend interactivity itself can be very complicated, and it generally is not fully specified by design (do your design specs come with state machines?) A few things that are often missing from a Figma/similar are things like error states, loading states, handling longer text content than the mockup, and responsive design.