Once For All UK - Mobile App UX/UI Designer

UI Designer is needed in Basingstoke, United Kingdom.

Client: Once For All UK

Location: Basingstoke, United Kingdom

Contract: Contractor

Job Description

Once For All is a high-growth, cloud-based, SaaS subscription business that helps customers manage their supply chain governance, risk management, and compliance. With over 250k customers across the UK in 20 different sectors, we are seeking a Mobile App UX/UI Designer for a 6-month contract role. This individual will lead the design and user experience of our upcoming marketplace app, working closely with product managers, developers, and researchers to ensure a seamless, mobile-first user experience that enhances engagement and conversion.

Job Responsibilities

• Design user-centered experiences for the marketplace mobile app, from concept to high-fidelity UI.
• Develop wireframes, interactive prototypes, and user flows to illustrate design ideas.
• Ensure designs are mobile-first and optimized for iOS and Android platforms.
• Collaborate with user research teams to gather insights and refine designs based on feedback.
• Work within and contribute to Once For All’s design system, ensuring consistency across products.
• Partner with developers to ensure smooth handoff and implementation of designs.
• Advocate for accessibility and best UX/UI practices in mobile design.

Requirements

• 5+ years of UX/UI design experience, with a focus on mobile apps.
• Strong portfolio showcasing marketplace, SaaS, or B2B mobile product designs.
• Proficiency in Figma, including components, variables, tokens, and prototyping.
• Experience in mobile-first and responsive design, following iOS and Android UI guidelines.
• Knowledge of user testing, feedback loops, and data-driven design decisions.
• Familiarity with design handoff tools and collaboration with developers.
• Strong communication skills and ability to present design rationale effectively.

Nice to Have

• Experience designing for B2B marketplaces or procurement platforms.
• Understanding of motion design and micro-interactions for app engagement.
• Familiarity with construction industry software or compliance-related platforms.
• Knowledge of front-end development principles (HTML, CSS, React Native) for better collaboration.