Senior UX/UI Designer (CRO) - Contract

VML, part of WPP, is a leading creative company combining brand experience, customer experience, and commerce to create connected brands driving growth. The agency works with blue chip clients such as AstraZeneca, Colgate-Palmolive, Dell, Ford, Microsoft, Nestlé, The Coca-Cola Company, and Wendy's. VML Enterprise Solutions division includes strategic consultants, creative and technical architects, and skilled developers supporting digital experiences across marketplaces, online retailers, D2C, B2B, and social platforms, with over 4,200 experts in 55 operational centres across 34 countries.

• Experience designing for A/B testing, personalisation, CRO, or landing page optimisation, informed by user insight and performance data.
• Deep understanding and mastery of tokenized design systems (design tokens in Figma) for managing styling variables and brand changes.
• Proven ability to design distinct user journeys for multiple sub-brands balancing brand customization and systemic rules.
• Experience designing high-converting digital commerce and product experiences for e-commerce, transactional websites, or lead-generation pages.
• Exceptional portfolio demonstrating end-to-end design process with user insights, data, and test hypotheses.
• Mastery of UX and conversion principles including user psychology, persuasive design, usability standards, responsive layouts, and platform-specific guidelines.
• Exceptional proficiency in Figma and prototyping with scalable design files and realistic prototypes.
• Solid understanding of front-end capabilities (HTML, CSS, basic JavaScript) to ensure technical feasibility.
• Strong communication skills with a collaborative mindset, comfortable presenting design rationale and working in agile cycles.
• Strong understanding of web accessibility (WCAG) and page performance considerations for fast, inclusive experiences.

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 optimized for experimentation and user validation.
• Create pixel-perfect UI designs respecting and elevating clients' brand guidelines using persuasive design patterns and conversion-focused hierarchies.
• Work with and support tokenized design systems ensuring scalability, efficiency, and consistency across a multi-brand environment.
• Design and optimize unique user journeys for clients' sub-brands while maintaining core design system architectures.
• Focus on landing page layouts, micro-interactions, persuasive copy placement, and checkout/signup funnel optimisation to minimize friction.
• Translate user feedback, testing data, and statistical results from A/B tests into actionable design recommendations.
• Ensure all experiment designs are technically feasible and collaborate closely with developers during implementation.

Collaboration & CRO Advocacy:

• Work closely with CRO Strategists, Web Analysts, Product Managers, and front-end Developers in a fast-paced, agile squad environment.
• Advocate for data-informed, evidence-based design decisions, presenting concepts and rationale clearly to clients and stakeholders.
• Contribute to and maintain conversion-oriented design libraries, templates, and documented best practices to scale optimisation efforts.

VML Enterprise Solutions is committed to fostering a transparent and ethical work environment in compliance with Polish regulations. The company encourages reporting of any potential irregularities or misconduct and provides a whistle-blower policy and reporting procedures.