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Closure Technologies is seeking a  UI/UX Engineer in McLean,   VA  who will conduct user research, lead UX strategy and design system development, and produce accessible, high-fidelity UI designs and prototypes for complex, high-visibility applications. Clearance Requirement:  TS/SCI with Polygraph Key Responsibilities: User Research & Analysis Plan and conduct user research activities including interviews, usability testing, and feedback sessions with diverse user groups (e.g., analysts, SMEs, managers, data scientists). Analyze and synthesize research findings into actionable insights, personas, user journeys, and workflow maps. Document research findings and recommendations to support stakeholder understanding and buy-in, particularly in government settings. Apply ethical, secure, and compliant research practices appropriate for classified or sensitive environments. UX Strategy & Design Systems Lead UX and UI efforts for complex, high-visibility applications. Define, maintain, and evolve design systems and component libraries in collaboration with engineering teams. Establish consistent interaction patterns, workflows, and design standards across multiple applications. Create service blueprints and end-to-end experience maps to align cross-functional teams UI Design & Prototyping Develop interactive prototypes using tools such as Figma, Adobe XD, or similar, to explore concepts and validate user flows. Produce high-fidelity UI designs that are accessible, usable, and visually consistent. Ensure designs align with accessibility standards (e.g., WCAG) and applicable government design guidelines. Document interaction behaviors, design rationale, and micro-copy to support implementation Required Qualifications: Active U.S. Government Security Clearance at the TS/SCI level with required polygraph. Bachelor’s degree in Design, Human-Computer Interaction, Psychology, Computer Science, or a related field (or equivalent experience). Minimum 8 years of experience with a Bachelor’s degree; or 7 years of experience with a Masters degree; or 6 years of experience with a Doctorate Demonstrated experience conducting UX research, analysis, and synthesis (not UI-only). Strong proficiency with design and prototyping tools such as Figma, Adobe XD, or equivalent. Experience collaborating closely with product managers and engineering teams. Ability to clearly articulate design decisions and research findings to stakeholders.