Principal Designer (UI Design, Branding, Digital Product Design)

Principal Product Designer (UI Design & Digital Product Design)

£650 per day | Inside IR35
6-month contract
London – Hybrid (2 days per week onsite)

Overview
We're looking for an exceptional Principal Product Designer to play a key role in building a large-scale digital platform from the ground up.

This is a rare greenfield opportunity to define the visual identity, interaction patterns and design standards for a suite of modern digital products. Working closely with Product, Engineering and senior stakeholders, you'll create outstanding user experiences while establishing a scalable design system that will underpin the platform for years to come.

This role is ideal for a highly experienced designer with exceptional UI and interaction design skills, a strong portfolio of shipped products, and a passion for creating elegant, intuitive experiences at scale.

Role & Responsibilities

Own and evolve the visual design language across multiple digital products.
Create high-fidelity UI designs, interactive prototypes and detailed design specifications.
Lead the development and governance of a scalable design system, including reusable components, design tokens and documentation.
Define interaction patterns that deliver intuitive, accessible and consistent user experiences.
Work closely with engineers to ensure pixel-perfect implementation and design quality.
Translate complex business and technical requirements into simple, engaging interfaces.
Champion accessibility, usability and responsive design best practices.
Help shape design standards and establish UI governance across the wider organisation.
Skills & Experience

Significant experience as a Principal Product Designer, Product Designer, UI Designer, Interaction Designer or Design Systems Designer.
Outstanding portfolio demonstrating exceptional UI, visual and interaction design across complex digital products.
Proven experience building and scaling design systems, component libraries and reusable design patterns.
Expert-level proficiency with Figma and modern prototyping tools.
Strong understanding of accessibility (WCAG), responsive design and front-end implementation considerations.
Experience working closely with engineering teams throughout the full product lifecycle.
Excellent communication and stakeholder management skills, with the ability to influence both technical and non-technical audiences.
Desirable Experience

Experience defining design system strategy within greenfield environments.
Working knowledge of HTML, CSS and modern front-end frameworks.
Experience designing enterprise-scale platforms and complex user journeys.
Background delivering products within regulated, public sector or highly governed environments.
Experience contributing to product strategy while remaining hands-on with design delivery.
Contract: 6 months
Rate: £650 per day (Inside IR35)
Location: London (Hybrid – 2 days per week onsite)