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Senior UI/UX Engineer- Quantum Computing (m/w/d)

eleQtron - Siegen, Nordrhein-Westfalen, Germany - In-office - posted 2026-09-15

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eleQtron develops full-stack quantum computers based on trapped-ion technology. We are seeking a Senior UI/UX Engineer to own the end-to-end user experience across two product surfaces: a customer-facing cloud platform for submitting quantum programs and exploring results, and an internal operator interface for running, monitoring, and calibrating quantum machines in the lab. This is a design-led role requiring hands-on ownership from concept through shipped product. You will set the design direction for both surfaces while maintaining coherence as a unified product family, and you will build the production-ready component library that both applications are assembled from. Key responsibilities include: - Owning design direction for both customer-facing and internal operator interfaces, ensuring visual and interaction consistency - Conducting user research: interviewing operators and physicists, observing real calibration workflows in the lab, and translating insights into design decisions - Producing wireframes, interactive prototypes, and high-fidelity designs for both surfaces - Building and maintaining a design system as production-ready, tested components in code (React/TypeScript) - Making dense telemetry and calibration data legible through effective visualization patterns - Running usability tests on implemented interfaces and maintaining quality standards between design intent and delivered product - Collaborating with backend and platform engineers to shape APIs from the user's perspective - Setting standards for accessibility, usability, and visual consistency across the engineering team You will work in a seed-stage deep-tech environment where academic research meets commercial applications, collaborating with domain experts (physicists, operators, engineers) to solve complex, ambiguous problems. Requirements: - 5+ years of professional experience in product or interaction design with a portfolio of shipped digital products - Proficiency in TypeScript and React, including component testing and documentation (e.g., Storybook); ability to build your own designs as reusable production components - Mastery of the full design toolkit: research, information architecture, interaction design, prototyping, visual design; Figma as daily driver - Demonstrated experience designing for complex, data-heavy, or expert-user products (not consumer apps) - Track record of building or substantially owning a design system - Experience planning and running usability testing and acting on findings - Ability to collaborate effectively with domain experts and turn ambiguous problems into clear designs - Strong adaptability and quick learning mindset - Good proficiency in English (written and spoken) Bonus qualifications: - Experience with real-time data in the browser (WebSockets, streaming telemetry) - Background in scientific, industrial, or laboratory control software - Applied knowledge of accessibility standards (WCAG) - Experience mentoring designers or leading design in cross-functional teams - Prior exposure to quantum computing or other deep-tech domains

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