Senior UX/UI Designer (CRO)- Contract

VML Enterprise Solutions; Poznań; Hybrid; PLN 120,000 - 190,000; Full time

Job summary

VML Enterprise Solutions is seeking a hands-on UX/UI or Product Designer with a CRO focus to craft high‑performing digital experiences across web and mobile. You will drive end‑to‑end design for A/B tests and multivariate experiments, translating data into design variations and optimized user journeys.

You will collaborate in a cross‑functional CRO squad, refining design tokens in Figma, maintaining brand identities, and ensuring scalable components across sub-brands while partnering with

Qualifications

• Desirable: experience designing for A/B testing, personalisation, CRO.
• Tokenised design systems mastery in Figma.
• Ability to design for multi-brand environments with scalable components.

Responsibilities

• Lead end-to-end UX/UI design for A/B tests, landing pages and CRO initiatives.
• Develop user flows, wireframes, prototypes, and detailed specs for experimentation.
• Create pixel-perfect designs that align with client brand guidelines and drive conversions.
• Collaborate with tokenised design systems to ensure consistency across brands.
• Translate test data and feedback into actionable design improvements.
• Work with developers to ensure high‑fidelity test execution.

Skills

A/B testing

Personalisation

CRO

Design tokens (Figma)

Multi-brand design

E-commerce UX

UX principles

Figma

Frontend basics

Collaboration

Accessibility

Prototyping

Tools

HTML

CSS

JavaScript

Job description

Who We Are

WPP Enterprise Solutions designs, builds, and operates the growth systems that competitive businesses rely on. In a world where Al is reshaping how companies drive growth, we lead clients in business transformation and marketing modernization, connecting strategy directly to execution. Our 12,000 experts in engineering and platforms, commerce, consulting, content transformation, CRM, and CX work within a unified global operating unit across 40+ markets. WPP Enterprise Solutions works alongside best-in-class partners including Adobe, AWS, Braze, Google, Microsoft, Salesforce, and Shopify, as well as innovators in AI, to deliver growth solutions tailored to the needs of our clients’ businesses. VML, part of WPP, supports WPP Enterprise Solutions by helping brands activate transformation through creativity and experience.

Who We Are

WPP Enterprise Solutions designs, builds, and operates the growth systems that competitive businesses rely on. In a world where Al is reshaping how companies drive growth, we lead clients in business transformation and marketing modernization, connecting strategy directly to execution. Our 12,000 experts in engineering and platforms, commerce, consulting, content transformation, CRM, and CX work within a unified global operating unit across 40+ markets. WPP Enterprise Solutions works alongside best-in-class partners including Adobe, AWS, Braze, Google, Microsoft, Salesforce, and Shopify, as well as innovators in AI, to deliver growth solutions tailored to the needs of our clients’ businesses. VML, part of WPP, supports WPP Enterprise Solutions by helping brands activate transformation through creativity and experience.

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, maximise 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 optimised 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 optimised 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‑centred 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 tokenised design systems (DS), ensuring scalability, efficiency, and consistency of components across a multi‑brand environment.
• Design and optimise 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 minimise 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.
• Tokenised Design Systems (DS) Mastery: Deep understanding of working with and leveraging tokenised 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, optimised 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.

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.

About WPP

WPP is the trusted growth partner for the world’s leading brands. With exceptional talent, trusted data and intelligence and world‑class partnerships – all united by our agentic marketing platform, WPP Open – we help clients navigate change, capture opportunity and deliver transformational growth. For more information, visit WPP.com.

WPP (VML/WPP Enterprise Solutions) is an equal opportunity employer and considers applicants for all positions without discrimination or regard to characteristics. We are committed to fostering a culture of respect in which everyone feels they belong and has the same opportunities to progress in their careers.