This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Designer (Principle Prototyping) based in United States. As a Senior Designer, you will bring a high-profile mobile product concept to life through sophisticated interaction design and high-fidelity prototyping. You will work closely with an established product design team to transform Figma designs into realistic, engaging interactive experiences. The role centers on Principle, with a strong focus on motion, transitions, gestures, and thoughtful microinteractions. You will help ensure that prototypes accurately communicate the intended user experience while adding polish and behavioral detail. This is a hands-on opportunity for a designer who combines strong visual and interaction design instincts with deep prototyping expertise. You will work in a collaborative, fast-moving environment where iteration, experimentation, and attention to craft are highly valued. The ideal candidate is an independent practitioner who can move quickly while maintaining a high standard of quality and fidelity.