Senior UX/UI Designer (CRO)

Wundermanthompson; Greater London; On-site; GBP 60,000 - 90,000; Full time

Job summary

VML is seeking a highly skilled UX/UI or Product Designer with a CRO focus to join our hybrid team in London. You will craft premium web experiences and landing pages across desktop and mobile, translating data and hypotheses into high-impact design variations that drive conversions and business growth.

You will own end-to-end design for A/B and multivariate tests, work within a CRO squad, and collaborate across disciplines to deliver optimized journeys for our clients and sub-brands.

Qualifications

• HANDS-ON UX/UI or Product Designer with CRO and experimentation focus.
• Translate data, analytics, and hypotheses into high-impact design variations.
• Own end-to-end design lifecycle for A/B and multivariate tests.

Responsibilities

• Lead end-to-end UX/UI design for A/B testing, multivariate testing, landing pages, and optimisation across web and mobile.
• Develop user flows, wireframes, and interactive prototypes for experimentation and validation.
• Create pixel-perfect UI designs aligned with brand guidelines and persuasive patterns.
• Support tokenized design systems to ensure scalable, consistent components across multi-brand environments.
• Design tailored user journeys for sub-brands while maintaining core design system architecture.

Skills

Conversion-centered design

UX/UI design

A/B testing

Multivariate testing

Wireframes

Prototypes (high-fidelity)

Design systems

Web/mobile usability

Data-driven optimization

Brand guidelines

Tools

Figma

Adobe XD

Job description

Who We Are

VML is a global creative company that combines brand experience, customer experience, and commerce to create connected brands that drive growth. Guided by a Human First philosophy, VML is known for its innovative work for brands and consistently ranks among the world's leading creative companies, including the WARC Creative 100. VML's global network spans 55+ markets with principal offices in Buenos Aires, Kansas City, London, New York, São Paulo, Shanghai and Singapore.

VML is part of WPP, the trusted growth partner for the world's leading brands. Powered by exceptional talent and our agentic marketing platform WPP Open, WPP unites cutting-edge media intelligence and data solutions, creativity, production, enterprise solutions and expert strategic counsel.

For more information, please visit www.vml.com and follow along on LinkedIn #WeAreVML.

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,