Design Sprint Developers facilitate a five-day process for solving big product challenges using prototyping and testing ideas. They lead a team through a series of structured activities to define goals, validate assumptions, and decide on a product roadmap. They sketch competing solutions on paper, make critical decisions fast, and turn abstract ideas into a realistic prototype. They also test the prototype with potential users to gain valuable feedback. These developers work closely with stakeholders, designers, and other team members, playing a vital role in steering the product development towards creating user-centric solutions.