Senior UI/UX Designer

Senior UI/UX DesignerDuration: 6+ Months of Contract with Possible ExtensionLocation: Waltham, MA (Open for Remote as well if candidate is good)Only 10+ Years of Candidate are entertained and Portfolio link should be there on top of resumeRoles and Responsibilities:Execute high-quality UI design across multiple active web and mobile projects, working within and contributing incremental enhancements to an established design systemPartner with design leads to translate strategic direction into polished, production-ready components, screens, and prototypes.Build on existing component libraries — contributing new patterns that align with established conventionsCreate wireframes and prototypes at appropriate fidelity levels to communicate design intent to developers and stakeholdersApply UX fundamentals (user flows, IA, usability) to inform UI decisionsManage concurrent workstreams, surface blockers early and maintain steady outputParticipate in design reviews, incorporate feedback and iterate efficientlySupport handoff and design QA, ensure developer alignment with final specsSkills & Experience:Demonstrated senior-level execution in production environments. Portfolio should show visual craft, as well as fluency with systems and component-level thinking.Expert-level Figma skills: components, variants, auto layout, prototyping, and working within a mature design systemExperience designing for both adaptive web and native mobileFamiliarity with accessibility standards (WCAG 2.x)Self-directed and organized, able to maintain momentum across multiple workstreamsCommunicates clearly and proactively; responsive to feedback and shifting prioritiesPortfolio Requirements:· Portfolio work should demonstrate senior-level UI execution within a structured design environment. Specifically, we want to see:Design system contribution· Examples of extending or building upon an existing component library: new variants, pattern additions, or documentation.High-fidelity UI screens· Polished, production work across web and/or mobile. We're evaluating visual craft, typographic and spacing decisions, and consistency across screens, not just wireframes or flows.Prototypes· At least one interactive prototype demonstrating transitions, states, or interaction logic relevant to the project context.Iteration examples· Work showing how you responded to feedback or constraints from a lead or stakeholder. We want evidence of collaborative execution, not just independent creative direction. Sparktek