Handoffs are where intent gets lost. A design is approved, passed over a wall and rebuilt with slightly different spacing, behaviour and edge cases. Each small difference is cheap. Together they change the product.
Shared constraints early
Engineers know what is expensive; designers know what matters to users. Talking in week one avoids designing something impractical or building something nobody needs.
One system, not two
Design tokens (colours, type scale, spacing) can be defined once and used by both the design file and the code. Changing a value in one place updates the whole product.
Real content, real states
We design with realistic content, empty states, errors and loading. Beautiful screens with perfect data hide the moments users actually remember.
Small, frequent reviews
Short reviews of working software beat long reviews of static mock-ups. Problems surface while they are still easy to fix.