This work reinforced that successful digital transformation depends as much on organizational trust and operating rhythm as it does on interface design. The client initially approached UX with skepticism and a desire to move quickly, but by embedding design into the biweekly agile cadence, we created a more reliable way to make progress without skipping discovery. Sprint planning, effort estimation, recurring design reviews, and field visits helped the team break complex supplier workflows into manageable increments while still grounding decisions in real operational needs. The biggest lesson was that modernization does not always mean replacing the tools users rely on. While the initial instinct was to eliminate spreadsheets, research showed that Excel was not the problem—it was one of the ways users protected accuracy in a high-stakes pricing environment. By preserving trusted spreadsheet behaviors, adding clearer workflow visibility, and introducing smarter error checks before submission, the solution reduced risk while respecting how suppliers actually worked. Just as importantly, the project helped the client see UX as a practical delivery partner: one that could clarify complexity, reduce rework, and help an emerging design team contribute confidently within agile delivery.