Senior UX/UI Designer (CRO) - Contract

 Who We Are

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.

The opportunity:

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.

What you’ll be doing:

You are a hands-on, highly motivated, and self-sufficient UX/UI or Product Designer with deep expertise in conversion-centered design principles, web/mobile usability, and data-driven Optimisation. Your passion for user-centric design pushes you to create intuitive, efficient, and visually stunning digital experiences that perform.

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 from you:

• Desirable: Experience designing for A/B testing, personalisation, CRO, or landing page optimisation would be a bonus, particularly where design decisions have been informed by user insight, performance data, or test learnings.

• Tokenized Design Systems (DS) Mastery: Deep understanding of working with and leveraging tokenized design systems (design tokens in Figma) to manage styling variables, thematic brand changes, and cross-platform consistency efficiently.

• Multi-Brand Navigation: Proven ability to design distinct and unique user journeys for a client's various sub-brands, striking the perfect balance between brand customization and core systemic rules.

• Digital Commerce & Product Context: Experience designing high-converting experiences for e-commerce, transactional websites, lead-generation pages, or digital products is highly desirable.

• Exceptional Portfolio: A must-have portfolio showing a clear end-to-end design process, specifically highlighting how you use user insights, data, or test hypotheses to design landing pages, optimized user flows, and successful A/B test variations.

• Mastery of UX & Conversion Principles: Deep understanding of user psychology, persuasive design, usability standards, responsive layouts, and platform-specific UX/UI guidelines.

• Figma & Prototyping Proficiency: Exceptional proficiency in Figma, with the ability to create structured, scalable design files, component libraries, and realistic prototypes for testing.

• Technical Understanding: Solid understanding of front-end capabilities (HTML, CSS, and basic JavaScript limitations) to ensure your Optimisation designs are technically feasible and performant.

• Collaboration & Agility: Strong communication skills, with a collaborative mindset, comfortable presenting design rationale to stakeholders and working in fast-paced agile development/testing cycles.

• Accessibility & Performance: Strong understanding of web accessibility (WCAG) and page performance considerations to design fast, inclusive, and seamless experiences.

What we can offer you:

Alongside the opportunity to work with some of the most exciting brands around the world, we’ll also prioritise your career development and help you grow your skills. We’ll empower you to make a difference, allow you to be yourself, and respect who you are.

Our culture thrives on our core values, designed for impact-driven individuals: Heart, Brains and Courage.

We lead with Heart, fostering empathy and trust where genuine connections and human-centric work flourish.
We empower your Brains for innovation, valuing relentless curiosity and collaborative intelligence to solve complex challenges.
And we champion Courage, inspiring you to speak up, embrace experimentation, and advocate for bold solutions that push our thinking to be better than yesterday.

AT VML Enterprise Solutions

Our Enterprise Solutions division houses strategic consultants, creative and technical architects and skilled developers and operators that together help some of the world’s leading organisations to deliver outstanding digital experiences across all major routes to market worldwide: marketplaces, online retailers, D2C, B2B and social platforms. With over 4,200 experts in 55 operational centres across 34 countries, our capabilities span the entire buying journey from customer acquisition, through engagement, to conversion and loyalty, driving multi-channel growth for world-leading brands.

We work with some of the most exciting brands such as The Coca-Cola Company, EY, Bosch, Unilever, Ford, DFS, Mercedes-Benz, Johnson & Johnson, Nestlé, Sainsbury’s, Selfridges, Shell and Tiffany & Co. We’ve built over 500 platforms for brands and retailers and generate in excess of $29bn annually for our clients and work with over 50 strategic partners including Adobe, SAP, Salesforce, HCL, Shopify, Sitecore, BigCommerce, commerce tools and Acquia. Our reputation is based on our people, and we believe we have some of the best in the business.

As our business grows internationally, we’re looking for new people to join us on our journey to inspire and take a key role in shaping some of the best commerce solutions, services, and websites in the world. Working as a team, no problem is insurmountable; we share in our client’s successes and believe that anyone can show creative bravery no matter what their role is in the team.

#LI-EMEA

In compliance with Polish regulations, VML Enterprise Solutions is committed to fostering a transparent and ethical work environment.

We encourage reporting of any potential irregularities or misconduct. For detailed information on our whistle-blower policy and reporting procedures, please refer to our dedicated document.

The gross salary for this position at the time of this posting is indicated below. This range reflects our broader group’s compensation framework across diverse agencies and disciplines. For this specific role, our offer will be determined within this range based on our internal benchmark, reflecting the specific market conditions for our discipline. Individual compensation varies based on job-related factors, including business needs, experience, level of responsibility and qualifications.

In addition to the salary range provided, we offer a comprehensive benefits package designed to support our employees' well-being and professional growth. While specific details may vary by agency, typical benefits often include: private medical care, professional development opportunities, training programmes and flexible working arrangements (where applicable). Some agencies may offer additional benefits.