Principal Product Designer (Interaction Design UX & Design Systems)

Principal Product Designer (Interaction Design UX & Design Systems) £550 - £650 per day (Outside IR35) London (Hybrid) x2 days onsite 6 month contract Overview We are looking for an exceptional Principal Product Designer to join an exciting organisation building a large-scale digital platform from the ground up. This is a rare opportunity to define the visual and interaction design language of a greenfield product ecosystem. Working closely with senior product, engineering, and leadership teams, you will shape how users experience the platform, establish design standards, and create the foundations of a scalable design system. The ideal candidate combines outstanding visual craft with strong interaction design expertise and thrives in environments where they can influence both product direction and design culture.   Role & Responsibilities Own and evolve the visual and interaction design language across a suite of digital products Create high-fidelity designs, prototypes, and user experiences that are intuitive, elegant, and accessible Build and maintain a scalable design system, including reusable components, patterns, and documentation Define standards for design quality, usability, consistency, and accessibility Work closely with engineers to ensure designs are implemented accurately and to a high standard Collaborate with product and delivery teams to translate complex requirements into engaging user experiences Champion user-centred design and contribute to research, testing, and continuous improvement activities  Essential Skills & Experience Significant experience as a Product Designer, Interaction Designer, or UX/UI Designer working on complex digital products at an enterprise level A portfolio demonstrating exceptional visual design, interaction design, and design systems work Experience building or contributing to scalable design systems and component libraries Strong proficiency with modern design and prototyping tools Excellent understanding of accessibility, usability, and responsive design principles Ability to work effectively in fast-paced environments with evolving requirements Strong stakeholder management and communication skills  Desirable Skills & Experience Experience establishing design standards within growing teams or greenfield programmes Knowledge of front-end technologies and how design translates into production Experience working within complex, regulated, or highly governed environment Familiarity with modern product development practices and cross-functional delivery teams