UI/UX designer needed for creating a responsive high fidelity website prototype for development team

Need a UX/UI designer to produce high fidelity prototypes to hand off to development team. All the low fidelity mockups will be provided (250 mockups, half desktop view and half mobile view). Icons will also need to be created based on our recommendations. The prototype will need to be fully responsive. Will need to sign an NDA prior to starting project. All applications but reside in the United States! Experience: -5 to 7+ years experience developing web-based responsive applications -Extensive experience building rich high fidelity prototypes -Proven work experience as a UI/UX Designer or similar role -Portfolio of design projects available -Knowledge of wireframe tools (e.g. Axure, [login to view URL] and InVision) -Up-to-date knowledge of design software like Adobe Illustrator and Photoshop -Team spirit; strong communication skills to collaborate with various stakeholders -Good time-management skills -BS in Design, Computer Science or relevant field Responsibilities: -Gather and evaluate user requirements in collaboration with product managers and engineers -Illustrate design ideas using storyboards, process flows and sitemaps -Design graphic user interface elements, like menus, tabs and widgets -Build page navigation buttons and search fields -Develop UI mockups and prototypes that clearly illustrate how sites function and look like -Create original graphic designs (e.g. images, sketches and tables) -Prepare and present rough drafts to internal teams and key stakeholders -Identify and troubleshoot UX problems (e.g. responsiveness) -Conduct layout adjustments based on user feedback -Adhere to style standards on fonts, colors and images