Senior UX/UI Designer (CRO) - Contract

📍 Job Overview

Job Title: Senior UX/UI Designer (CRO) - Contract

Company: VML/WPP Enterprise Solutions

Location: Poznan, Greater Poland, Poland

Job Type: Contract

Category: Conversion Rate Optimization (CRO) / UX/UI Design

Date Posted: 2026-09-16T08:14:49

Experience Level: Mid-Senior Level (5-10 years)

Remote Status: Hybrid

🚀 Role Summary

• This role focuses on driving user engagement and maximizing conversions through expert UX/UI design for A/B and multivariate testing initiatives.

• You will be responsible for translating user data, behavioral analytics, and strategic hypotheses into high-impact design variations and optimized user journeys within a dedicated CRO squad.

• The position requires a hands-on designer adept at creating and optimizing premium web and mobile experiences, with a strong emphasis on conversion-centered design principles and data-driven optimization.

• You will collaborate closely with cross-functional teams, including CRO Strategists, Web Analysts, Product Managers, and front-end Developers, in a fast-paced, agile environment.

📝 Enhancement Note: The job title "Senior UX/UI Designer (CRO)" and the description clearly indicate a specialized role within UX/UI, focusing on conversion rate optimization. The "Contract" employment type suggests a project-based engagement, likely requiring a high degree of self-sufficiency and demonstrable results. The mention of "tokenized design systems" and "multi-brand navigation" points to a complex, enterprise-level client environment.

📈 Primary Responsibilities

• Lead the end-to-end UX/UI design process for A/B testing, multivariate testing, landing page optimization, and ongoing CRO 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 adhere to and enhance client brand guidelines, employing 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 a client's portfolio of sub-brands, maintaining sub-brand visual identities while adhering to core design system architectures.

• Focus on landing page layouts, micro-interactions, persuasive copywriting placement, and checkout/signup funnel optimization 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 for high-fidelity execution of tests.

• 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 optimization efforts.

📝 Enhancement Note: The responsibilities emphasize a full-cycle design approach within an experimentation framework. The need to design for "multi-brand navigation" and "tokenized design systems" indicates a focus on scalable and adaptable design solutions for complex client portfolios, a common requirement in enterprise-level operations.

🎓 Skills & Qualifications

Education: While no specific degree is mandated, a strong portfolio and practical experience are paramount. A background in Design, Human-Computer Interaction (HCI), or a related field is beneficial.

Experience: 5-10 years of experience in UX/UI or Product Design, with a significant focus on conversion-centered design principles and digital product optimization.

Required Skills:

• 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 various sub-brands, balancing brand customization with core systemic rules.

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

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

• Technical Understanding: Solid understanding of front-end capabilities (HTML, CSS, and basic JavaScript limitations) to ensure optimization 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.

Preferred Skills:

• Experience designing for A/B testing, personalization, CRO, or landing page optimization, particularly where design decisions were informed by user insight, performance data, or test learnings.

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

📝 Enhancement Note: The emphasis on "tokenized design systems" and "multi-brand navigation" suggests a need for designers experienced in large-scale, complex digital ecosystems. The requirement for a strong portfolio with specific examples of conversion-focused design and experimentation is a critical differentiator for this CRO-centric role.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

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

• Demonstrations of how you translated raw data or strategic hypotheses into tangible design solutions that led to measurable improvements in conversion rates or user engagement.

• Examples of working with or adapting existing design systems, with a particular focus on how you managed brand variations or implemented tokenized design principles.

• Case studies that detail the problem, your design process, the specific CRO/experimentation strategies employed, and the resulting outcomes or learnings. Process Documentation:

• Showcase your approach to documenting user flows, wireframes, and interactive prototypes, ensuring clarity and technical feasibility for development teams.

• Provide examples of how you have collaborated with analytics teams to interpret test results and iterate on designs based on performance data.

• Demonstrate your method for creating design specifications and providing feedback during the development and QA phases of A/B tests.

📝 Enhancement Note: The portfolio requirement is central to this role, demanding specific evidence of conversion-focused design and A/B testing experience. The emphasis on "end-to-end design process" and "successful A/B test variations" indicates a need for a designer who can not only create but also validate and iterate on designs based on performance metrics.

💵 Compensation & Benefits

Salary Range: As this is a contract position in Poland, the salary will be negotiated based on experience, skills, and the specific terms of the contract. For a Senior UX/UI Designer with CRO specialization in Poznan, Poland, an estimated gross salary range could be PLN 15,000 - PLN 25,000 per month, depending on the contract type (e.g., B2B vs. employment contract) and the negotiation with the agency/client.

Benefits:

• Opportunity to work with leading global brands and on high-impact projects.

• Focus on career development and skill growth.

• Empowerment to make a difference and innovate.

• Inclusive and respectful company culture.

• Flexible working environment.

Working Hours: The standard working hours are estimated at 40 hours per week, typical for a full-time contract role. Flexibility may be offered within a hybrid work arrangement.

📝 Enhancement Note: Salary is estimated based on market research for senior-level UX/UI designers in Poland, considering specialization in CRO and the contract nature of the role. Specific benefits are drawn from the "What we can offer you" section of the job description, with an emphasis on aspects relevant to professional growth and work environment.

🎯 Team & Company Context

🏢 Company Culture

Industry: Digital Transformation, Marketing, Consulting, and Enterprise Solutions. VML/WPP Enterprise Solutions operates at the intersection of technology, creativity, and business strategy to help clients drive growth.

Company Size: WPP is a global leader in advertising and marketing services, with VML/WPP Enterprise Solutions likely comprising a significant portion of its 12,000+ experts across 40+ markets. This suggests a large, globally integrated organization with a focus on specialized enterprise solutions.

Founded: WPP was founded in 1982. VML was founded in 1992, and the merger with Wunderman forming Wunderman Thompson occurred in 2018, followed by the integration of Wunderman Thompson and VML into VML in 2024. This history indicates a company with deep roots in marketing and digital transformation, constantly evolving and consolidating to meet market demands.

Team Structure:

• The role is embedded within a dedicated CRO squad, suggesting a cross-functional team structure including CRO Strategists, Web Analysts, Product Managers, and front-end Developers.

• This squad operates within the larger VML Enterprise Solutions division, which houses strategic consultants, creative and technical architects, and skilled developers and operators.

• Collaboration is expected across multiple client brands and potentially within the broader WPP network. Methodology:

• Data-Driven Optimization: The core methodology revolves around using user data, behavioral analytics, and A/B/multivariate testing to inform design decisions and drive measurable improvements.

• Agile Squad Environment: Work is conducted in a fast-paced, agile setting, emphasizing iterative development, quick feedback loops, and continuous improvement.

• Design System Utilization: A strong reliance on tokenized design systems to ensure scalability, consistency, and efficient management of design components across diverse client brands.

Company Website: https://www.vml.com/ (VML, part of WPP)

📝 Enhancement Note: The context emphasizes a large, global agency structure (WPP) with specialized divisions (VML Enterprise Solutions) and agile, cross-functional squads focused on specific business outcomes like CRO. The history of mergers and rebranding suggests a dynamic, evolving organization at the forefront of marketing and digital services.

📈 Career & Growth Analysis

Operations Career Level: This is a Senior-level contract position. It offers an opportunity to leverage significant experience in UX/UI design with a specialization in CRO, acting as a key contributor within an agile squad. The role is hands-on and requires a high degree of autonomy and expertise.

Reporting Structure: The designer will work within a dedicated CRO squad, likely reporting to a CRO Lead, Product Manager, or Squad Lead within VML Enterprise Solutions. Collaboration will extend to various client stakeholders.

Operations Impact: The role's primary impact is on driving measurable business growth for clients through optimized digital experiences. By improving conversion rates on websites and landing pages, the designer directly contributes to increased revenue, lead generation, and customer acquisition for the client's brands.

Growth Opportunities:

• Skill Specialization: Deepen expertise in CRO, A/B testing methodologies, user psychology in design, and advanced Figma techniques.

• Client Exposure: Gain experience working with a diverse portfolio of high-profile global brands, understanding their unique challenges and market positions.

• Cross-functional Expertise: Enhance collaboration skills by working closely with strategists, analysts, product managers, and developers in an agile setting.

• Design System Mastery: Become proficient in managing and evolving complex, tokenized design systems for multi-brand environments.

• Potential for Future Engagements: Successful contract performance can lead to further opportunities within VML Enterprise Solutions or WPP.

📝 Enhancement Note: As a contract role, "growth" is primarily focused on skill enhancement, project experience, and professional networking rather than traditional linear career progression within a single company. The emphasis is on becoming a highly skilled specialist in a high-demand area.

🌐 Work Environment

Office Type: Hybrid. This indicates a blend of remote work and in-office collaboration.

Office Location(s): Poznan, Greater Poland, Poland. Specific office details and accessibility would need to be confirmed with the hiring team.

Workspace Context:

• Collaborative Squad Environment: The role is embedded within a dedicated CRO squad, fostering close collaboration with peers and cross-functional team members.

• Access to Tools & Technology: Expect access to industry-standard design and collaboration tools, including Figma and potentially other project management or analytics platforms.

• Client-Centric Focus: The work is geared towards client success, requiring adaptability to different brand guidelines and project needs within the VML Enterprise Solutions framework.

Work Schedule: The role is structured around a 40-hour work week, typical for a contract position. The hybrid arrangement likely offers some flexibility in terms of daily hours and location, but adherence to project deadlines and team synchronization is crucial.

📝 Enhancement Note: The hybrid nature suggests a need for strong self-management and communication skills. The "embedded within our dedicated CRO squad" phrasing implies a highly collaborative and integrated team dynamic, even with remote components.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: Likely a review of your CV and portfolio to assess experience and alignment with the role's requirements, particularly CRO and design system expertise.

• Portfolio Presentation & Discussion: Expect to present your portfolio, walking through specific case studies that highlight your end-to-end design process for conversion optimization, A/B testing, and multi-brand design. Be prepared to discuss your rationale, the data that informed your decisions, and the results achieved.

• Technical/Skills Assessment: A discussion or practical exercise to evaluate your proficiency in Figma, understanding of design systems, and grasp of front-end constraints.

• Cross-functional Collaboration/Agile Fit: Interviews may involve hypothetical scenarios or discussions to assess your ability to collaborate effectively within an agile squad and communicate design decisions to diverse stakeholders.

• Final Interview: Potentially with a hiring manager or senior team member to discuss fit, career aspirations, and contract terms.

Portfolio Review Tips:

• Curate for CRO: Select projects that explicitly demonstrate your impact on conversion rates, user engagement, or key performance indicators (KPIs) related to optimization.

• Showcase Process: Clearly articulate your design process, from research and hypothesis generation to ideation, prototyping, testing, and iteration.

• Highlight Multi-Brand Design: Include examples of how you've managed or adapted designs for multiple sub-brands within a larger system, demonstrating your understanding of tokenized design systems.

• Quantify Results: Whenever possible, use data and metrics to showcase the success of your designs. Focus on measurable outcomes rather than just aesthetics.

• Figma Proficiency: Be ready to demonstrate your Figma skills, including component libraries, design tokens, and prototyping capabilities.

• Technical Feasibility: Be prepared to discuss the technical considerations behind your designs and how you ensure they are implementable by developers.

Challenge Preparation:

• CRO Scenarios: Prepare to discuss how you would approach optimizing a specific landing page or user flow based on given data or user pain points.

• Design System Application: Be ready to explain how you would use or adapt a tokenized design system for a new feature or sub-brand.

• Data Interpretation: Practice articulating how you interpret A/B test results and translate them into actionable design changes.

📝 Enhancement Note: The interview process is heavily weighted towards portfolio review, emphasizing practical skills and demonstrable results in CRO. Candidates should prepare to articulate their process and impact with data-driven examples, particularly concerning design systems and multi-brand environments.

🛠 Tools & Technology Stack

Primary Tools:

• Figma: Essential for UI design, wireframing, prototyping, and managing design systems, including design tokens.

• Prototyping Tools: Figma's built-in prototyping capabilities, or potentially others like InVision for specific workflows.

Analytics & Reporting:

• Web Analytics Platforms: Experience with tools like Google Analytics, Adobe Analytics, or similar platforms to interpret user behavior data and A/B test results.

• A/B Testing Platforms: Familiarity with platforms used for experimentation, such as Optimizely, VWO, Adobe Target, or Google Optimize.

CRM & Automation:

• While not directly a CRM role, understanding how UX/UI designs impact lead generation funnels within CRMs (like Salesforce) or marketing automation platforms is beneficial. Design System Management:

• Experience with design token principles and implementation within Figma or other design system tools.

📝 Enhancement Note: The explicit mention of "Figma" and "tokenized design systems" makes these critical tools for this role. Familiarity with A/B testing platforms and web analytics is also paramount for a CRO-focused designer.

👥 Team Culture & Values

Operations Values:

• Data-Driven Approach: Decisions are informed by user data, performance metrics, and the outcomes of A/B tests.

• User-Centricity: A deep understanding of user psychology and needs drives the creation of intuitive and effective digital experiences.

• Collaboration & Agility: Working effectively within cross-functional teams in a fast-paced, iterative environment is key.

• Impact-Driven: Focus on delivering tangible results and measurable business growth for clients.

• Brand Stewardship: Respecting and effectively adapting designs to diverse client brand guidelines while maintaining systemic consistency.

• Courage: Willingness to experiment, advocate for bold solutions, and push creative boundaries.

Collaboration Style:

• Embedded Squad Model: Close, daily collaboration with CRO strategists, analysts, product managers, and developers.

• Cross-Functional Communication: Actively communicating design rationale, presenting concepts, and providing technical specifications to diverse stakeholders.

• Feedback Integration: Openness to receiving and incorporating feedback from team members and clients to refine designs and test hypotheses.

• Knowledge Sharing: Contributing to design libraries, templates, and best practices to enhance the team's collective capabilities.

📝 Enhancement Note: The company values (Heart, Brains, Courage) translate into a culture that values empathy, intelligence, and boldness. For this role, this means approaching design challenges with user empathy, analytical rigor, and the courage to experiment and advocate for data-informed solutions.

⚡ Challenges & Growth Opportunities

Challenges:

• Balancing Multi-Brand Design: Effectively designing unique experiences for multiple sub-brands while maintaining consistency and leveraging a tokenized design system requires careful planning and execution.

• Translating Complex Data: Synthesizing user data, analytics, and A/B test results into actionable design hypotheses and variations.

• Technical Constraints: Ensuring designs are technically feasible and performant within the limitations of front-end development.

• Agile Pace: Managing multiple experimentation pipelines and delivering high-quality designs within rapid development cycles.

• Client Alignment: Effectively presenting and defending design decisions based on data and CRO principles to potentially diverse client stakeholders.

Learning & Development Opportunities:

• Advanced CRO Techniques: Deepen understanding of experimentation methodologies, statistical significance, and advanced conversion optimization strategies.

• Design System Architecture: Gain hands-on experience with sophisticated tokenized design systems and their application in enterprise environments.

• Client Portfolio Diversity: Exposure to a wide range of industries and brand challenges, broadening design adaptability.

• Cross-Disciplinary Collaboration: Enhance skills in working with data analysts, product strategists, and developers, fostering a holistic understanding of product development.

• Emerging Technologies: Opportunity to apply design principles to new digital products and platforms as they evolve.

📝 Enhancement Note: The challenges are inherent to complex enterprise-level CRO work. The growth opportunities are geared towards deepening specialization in these areas, making the candidate more valuable in the competitive CRO and UX/UI design landscape.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you used user data or A/B test results to significantly improve a conversion rate. What was your process, and what were the outcomes?" (Focus on your end-to-end process, data interpretation, and quantifiable results).

• "How would you approach designing a new landing page for a client's sub-brand, considering their existing design system and specific conversion goals?" (Demonstrate understanding of multi-brand design, tokenized systems, and conversion-focused thinking).

• "Explain your process for creating and managing design specifications for A/B test variations. How do you ensure technical feasibility and high-fidelity implementation?" (Highlight collaboration with developers and attention to detail).

• "How do you balance user experience best practices with persuasive design elements to drive conversions without compromising user trust?" (Showcase understanding of user psychology and ethical design). Company & Culture Questions:

• "What interests you about VML Enterprise Solutions and this specific CRO role?" (Research WPP, VML, and their approach to enterprise solutions and client work).

• "How do you embody the values of Heart, Brains, and Courage in your design process?" (Connect your past experiences to these values, e.g., empathy for users, analytical problem-solving, advocating for innovative solutions).

• "Describe your experience working in an agile, cross-functional team. What is your preferred collaboration style?" (Emphasize teamwork, communication, and adaptability). Portfolio Presentation Strategy:

• Storytelling: Structure your portfolio presentations around compelling narratives for each project. Clearly define the problem, your role, the process, the solutions, and the measurable impact.

• Data Visualization: If possible, visually represent the data and results that supported your design decisions and demonstrated success.

• Figma Walkthrough: Be prepared to share your Figma files to showcase your organizational skills, component libraries, design token implementation, and prototyping capabilities.

• Client Context: Briefly explain the client's business and the specific goals of the project to provide context for your design choices.

• Conciseness: Focus on the most relevant projects and tailor your presentation to the CRO and design system requirements of this role.

📝 Enhancement Note: Interview questions will likely probe your practical application of CRO principles, design system expertise, and collaborative abilities within an agile framework. A strong portfolio presentation is crucial for demonstrating these skills.

📌 Application Steps

To apply for this operations position:

• Submit your application through the provided link on Greenhouse.

• Customize Your Resume: Tailor your resume to highlight your experience in UX/UI design, Conversion Rate Optimization (CRO), A/B testing, design systems (especially tokenized systems), and Figma proficiency. Use keywords from the job description to ensure ATS compatibility.

• Curate Your Portfolio: Select 2-3 key projects that best showcase your end-to-end design process for conversion optimization, multi-brand design, and A/B testing. Ensure each case study clearly articulates the problem, your solution, your process, and the quantifiable results.

• Prepare Your Presentation: Practice walking through your portfolio case studies, focusing on articulating your design rationale, data-informed decisions, and the impact of your work. Be ready to discuss your Figma workflow and design system experience.

• Research VML/WPP: Familiarize yourself with VML Enterprise Solutions, WPP's broader offerings, their client portfolio, and their stated company values (Heart, Brains, Courage) to articulate your interest and cultural fit.

⚠️ Important Notice: This enhanced job description includes AI-generated insights and operations industry-standard assumptions. All details should be verified directly with the hiring organization before making application decisions.