Senior UX/UI Designer (CRO) - Contract

About the role

VML, part of WPP, is a leading creative company that combines brand experience, customer experience, and commerce, creating connected brands to drive growth. VML is celebrated for its innovative and human first, award-winning work for blue chip client partners including AstraZeneca, Colgate-Palmolive, Dell, Ford, Microsoft, Nestlé, The Coca-Cola Company, and Wendy's. The agency is recognized by the Forrester Wave™ Reports, as a Leader among Marketing Creative and Content Service Providers, Commerce Services, Global Digital Experience Services, Global Marketing Services and, most recently, Marketing Measurement & Optimization. In addition, VML's specialist health network, VML Health, is one of the world's largest and most awarded health agencies. VML's global network is powered by 26,000 talented people across 55+ markets, with principal offices in Kansas City, New York, Detroit, London, São Paulo, Shanghai, Singapore, and Sydney. About WPP WPP is the trusted growth partner for the world's leading brands. We unite cutting-edge media intelligence and data solutions, world-class creativity, next-generation production, transformative enterprise solutions and expert strategic counsel in a single company - powered by exceptional talent and our agentic marketing platform, WPP Open, to help our clients navigate change, capture opportunity and deliver transformational growth. For more information, visit WPP.com . Senior UX/UI or Product Designer with a specialized focus on Conversion Rate Optimisation (CRO) and experimentation to join our dynamic, flexible team, embedded directly within our dedicated CRO squad. We are seeking a highly skilled and passionate UX/UI or Product Designer with a specialized focus on Conversion Rate Optimisation (CRO) and experimentation to join our dynamic, flexible team, embedded directly within our dedicated CRO squad. This hybrid role is for a hands-on designer who excels at crafting, optimizing, and delivering high-performing digital experiences across desktop and mobile. You will design premium web experiences and landing pages that drive user engagement, maximize conversions, and seamlessly support business growth. You will be instrumental in translating user data, behaviour analytics, and strategic hypotheses into high-impact design variations and optimized user journeys. Working collaboratively within a cross-functional CRO squad, you will be responsible for the end-to-end design lifecycle of A/B and multivariate tests, ensuring every design is both meticulously executed and strategically optimized for maximum performance.

Responsibilities

• Conversion-Centered Design & Execution:
• Lead the end-to-end UX/UI design process for A/B testing, multivariate testing, landing pages, and ongoing Optimisation initiatives across web and mobile platforms.
• Develop detailed user flows, interaction models, wireframes, and interactive, high-fidelity prototypes specifically optimized for experimentation and user validation.
• Create pixel-perfect UI designs that respect and elevate our clients' brand guidelines, utilizing persuasive design patterns, psychological triggers, and clear, conversion-focused hierarchies.
• Work with and support tokenized design systems (DS) , ensuring scalability, efficiency, and consistency of components across a multi-brand environment.
• Design and optimize unique, tailored user journeys for our client's portfolio of sub-brands , ensuring sub-brand visual identities and unique experiences are maintained while adhering to core design system architectures.
• Focus on landing page layouts , micro-interactions, persuasive copywriting placement, and checkout/signup funnel Optimisation to systematically minimize friction.
• Translate user feedback, testing data, and statistical results from A/B tests into actionable, iterative design recommendations.
• Ensure all experiment designs are technically feasible and collaborate closely with developers during implementation, providing detailed specifications and reviewing builds to ensure high-fidelity execution of tests.
• Collaboration & CRO Advocacy:
• Work closely with CRO Strategists, Web Analysts, Product Managers, and front-end Developers in a fast-paced, agile squad environment to manage multiple experimentation pipelines.
• Advocate for data-informed, evidence-based design decisions , presenting design concepts and experimentation rationale clearly to clients and stakeholders to build alignment.
• Actively contribute to and maintain conversion-oriented design libraries , templates, and documented best practices to scale our Optimisation efforts.
• What we want fr

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