Senior UI Designer (mobile) H/F

📍 Job Overview

Job Title: Senior UI Designer (mobile) H/F

Company: NEXTON

Location: Paris, Île-de-France, France

Job Type: Temps complet (Full-time)

Category: Design Operations / UX/UI Design

Date Posted: 2026-08-28

Experience Level: 7+ Years

Remote Status: On-site

🚀 Role Summary

• Spearhead the design of intuitive and visually cohesive mobile-first user interfaces, ensuring a high-fidelity and responsive user experience.

• Drive the application and enhancement of the Design System and component libraries to maintain graphical consistency across all product interfaces.

• Define and implement micro-interactions and animations to elevate user engagement and product polish.

• Collaborate closely within an agile product team, integrating with POs, BAs, developers, and business stakeholders to deliver strategic digital solutions.

• Document interface patterns and best practices to foster knowledge sharing and ensure scalable design standards within a complex project environment.

📝 Enhancement Note: This role, while titled "UI Designer," has significant operational implications within the GTM and product development lifecycle. The focus on Design Systems, component libraries, and cross-functional agile collaboration highlights its role in streamlining design-to-development handoffs and ensuring brand consistency at scale, which are core to effective GTM operations. The requirement for 7+ years of experience and leadership suggests a senior individual contributor role with potential for mentorship.

📈 Primary Responsibilities

• Design and conceptualize mobile-first user interfaces, ensuring adherence to accessibility standards and best practices for iOS and Android platforms.

• Create high-fidelity mockups and interactive prototypes, translating complex user flows into intuitive and visually appealing designs.

• Develop and refine micro-interactions and animations to enhance user delight and streamline task completion within the application.

• Actively contribute to and evolve the existing Design System and component libraries, ensuring consistency, reusability, and scalability.

• Maintain rigorous graphical and UI coherence across all product touchpoints and user journeys.

• Document established interface patterns, guidelines, and design decisions for future reference and team onboarding.

• Foster strong collaborative relationships with UX Designers, Product Owners, Business Analysts, and Developers within an agile framework.

• Participate actively in agile ceremonies (e.g., sprint planning, daily stand-ups, retrospectives) to ensure design alignment with development sprints.

• Provide leadership and guidance on UI design best practices, particularly for complex strategic projects.

📝 Enhancement Note: The responsibilities emphasize a blend of creative design execution and operational rigor. The focus on documenting patterns, applying Design Systems, and working within agile rituals points to a need for structured design processes that integrate seamlessly with development and product management, critical for efficient Go-To-Market execution.

🎓 Skills & Qualifications

Education: Bachelor's degree or equivalent practical experience; a Master's degree (BAC+5) is preferred and aligns with the senior nature of the role.

Experience: A minimum of 7 years of progressive experience as a Senior UI Designer or Lead UI Designer, with a proven track record in mobile-first design.

Required Skills:

• Expertise in Figma: Mastery of Figma for design, component creation, auto-layout, and collaborative workflows.

• Mobile-First UI Design: Deep understanding and practical application of mobile-first design principles for iOS and Android.

• High-Fidelity Prototyping: Ability to create detailed, interactive prototypes that accurately represent the final user experience.

• Design System Management: Experience in applying, contributing to, and evolving Design Systems and component libraries.

• Responsive Design Principles: Understanding of how designs adapt across different screen sizes and devices.

• Micro-interactions & Animation: Skill in designing subtle animations and interactions to enhance usability and user engagement.

• Visual Consistency & Standards: Proven ability to maintain and enforce UI consistency and adherence to established standards.

• Agile Methodology: Familiarity with agile development processes, including participation in sprints and ceremonies.

• Leadership & Autonomy: Demonstrated leadership qualities, ability to work independently, and manage complex design tasks.

• Technical Constraints Awareness: Good understanding of technical constraints and best practices for iOS and Android development.

Preferred Skills:

• Accessibility Standards: Strong knowledge of WCAG and other accessibility guidelines for digital products.

• Banking/Financial Sector Experience: Prior experience designing for complex financial or banking applications.

• Strategic Project Experience: Proven ability to contribute to large-scale, strategic digital transformation initiatives.

• UX Design Collaboration: Experience working closely with UX Designers to translate user research and flows into compelling interfaces.

• Pattern Documentation: Skill in clearly and concisely documenting UI patterns and design guidelines.

📝 Enhancement Note: The emphasis on Figma, Design Systems, and mobile technical constraints directly supports operational efficiency by enabling faster design iterations, consistent component usage, and smoother handoffs to development teams. The preference for banking experience and strategic project involvement suggests a need for a candidate who can quickly grasp complex business requirements and translate them into user-friendly, compliant interfaces.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Mobile-First Case Studies: Showcase at least 2-3 comprehensive case studies focusing on mobile applications, detailing the design process from concept to final UI.

• Figma Expertise Demonstration: Include examples of complex Figma files, demonstrating proficiency in auto-layout, component creation, and Design System integration.

• Design System Contribution: Present examples of how you have applied or contributed to a Design System, highlighting component usage and consistency.

• Prototyping & Micro-interactions: Showcase interactive prototypes and examples of micro-interactions that have been designed and implemented.

• Visual Consistency Examples: Provide clear examples of how you've ensured visual and UI consistency across different screens or user flows.

Process Documentation:

• Workflow Design: Document your typical UI design workflow, from initial brief to final handoff, emphasizing collaboration points with UX and development.

• Design System Documentation: Show examples of how you document components, patterns, and guidelines within a Design System.

• Agile Integration: Illustrate how your design process integrates with agile sprints, including how you manage feedback and revisions within a sprint cycle.

• Handoff Procedures: Detail your process for handing off design assets and specifications to development teams, ensuring clarity and minimizing ambiguity.

📝 Enhancement Note: For a Senior UI Designer role, a portfolio is crucial. The emphasis here is on demonstrating not just aesthetic skills but also the ability to work within structured design processes, manage design systems operationally, and collaborate effectively within an agile framework. This aligns with how GTM and product teams rely on consistent, well-documented design assets for efficient product launches and updates.

💵 Compensation & Benefits

Salary Range: Based on industry benchmarks for a Senior UI Designer with 7+ years of experience in Paris, France, the estimated salary range is €60,000 - €85,000 per year, depending on experience and specific qualifications.

Benefits:

• Dynamic Communities: Access to NEXTON's internal professional communities for knowledge sharing and networking.

• Meetups & Training: Opportunities for skill development through regular meetups and professional training programs.

• Sports & Festive Events: Participation in company-sponsored sports activities and social events, fostering team cohesion.

• Sustainable Mobility Package: A package designed to support and encourage sustainable commuting options.

• Latest Generation Smartphone: Provision of a current-model smartphone for professional use.

• Health Insurance: Comprehensive health insurance coverage typical for full-time employees in France.

• Paid Time Off: Generous annual leave and public holiday allowance.

Working Hours: Standard full-time working hours, typically 40 hours per week, with potential for some flexibility depending on project needs and team agreements within the agile framework.

📝 Enhancement Note: The salary range is estimated based on French market data for senior design roles, considering the specified experience level and location. Benefits are directly extracted from the provided text, highlighting aspects that contribute to employee well-being and professional development, which are key considerations for attracting and retaining talent in specialized fields like design operations.

🎯 Team & Company Context

🏢 Company Culture

Industry: Digital Transformation, Consulting, IT Services (ESN), and Product Development. NEXTON operates at the intersection of these sectors, enabling large accounts and pure players to innovate.

Company Size: Over 450 experts, indicating a medium-to-large sized company with a significant presence and capacity for diverse projects. This size allows for specialized teams and a robust internal support structure.

Founded: 2011. This founding date suggests a company with established experience and a track record of growth, evolving with the digital landscape.

Team Structure:

• UX/UI Team: The role is embedded within a dedicated UX/UI team, suggesting a focus on user-centric design within the organization.

• Agile Product Team: Integration into an agile team alongside Product Owners, Business Analysts, and Developers, emphasizing a collaborative and iterative approach to product development.

• Reporting Line: Reports to a Lead Design, indicating a clear hierarchy and mentorship structure within the design function.

• Cross-functional Collaboration: Strong emphasis on close collaboration with various roles (PO, BA, Devs, Business) to ensure holistic product development.

Methodology:

• Agile: Core methodology for product development, ensuring flexibility, rapid iteration, and continuous feedback.

• Design System Driven: Reliance on Design Systems and component libraries for consistency and efficiency in UI design.

• Mobile-First Approach: Strategic focus on designing for mobile experiences first, reflecting current user behavior and market trends.

• User-Centric Design: Implicit focus on user experience and quality through collaboration with UX designers and attention to accessibility.

Company Website: https://www.nexton.com/

📝 Enhancement Note: NEXTON's positioning as a blend of consulting, factory, and ESN implies a dynamic work environment where employees can gain exposure to diverse client challenges and innovative digital strategies. The company's size suggests ample opportunities for professional growth and access to specialized knowledge within various expert communities.

📈 Career & Growth Analysis

Operations Career Level: This role represents a Senior Individual Contributor (IC) position within the Design function, with a strong focus on UI execution and operationalizing design standards. It is a key role in ensuring the quality and consistency of digital products, particularly on mobile platforms. The "Senior" title implies a level of autonomy and the expectation to mentor junior designers.

Reporting Structure: The Senior UI Designer reports to a Lead Design, who likely oversees multiple design projects or a specific product area. This structure provides mentorship and strategic direction while allowing the Senior UI Designer significant ownership over their design tasks.

Operations Impact: The Senior UI Designer's impact is directly tied to the quality, consistency, and usability of mobile applications. By maintaining a robust Design System, ensuring visual coherence, and crafting engaging micro-interactions, this role significantly influences user adoption, satisfaction, and the overall success of digital products. This, in turn, impacts customer engagement and brand perception, which are critical for Go-To-Market success.

Growth Opportunities:

• Design Leadership: Potential to grow into a Lead Design role, managing a team or a larger design function, and taking on more strategic design responsibilities.

• Specialization: Opportunity to deepen expertise in specific areas such as mobile UX, design systems, accessibility, or animation design.

• Cross-functional Expertise: Gaining deeper understanding of product management and development processes through close collaboration in agile teams.

• Client-Facing Experience: For those interested in consulting, opportunities to work on a variety of client projects and gain exposure to different industries and challenges.

• Mentorship: Developing leadership and mentoring skills by guiding junior designers and sharing best practices.

📝 Enhancement Note: The career path for a Senior UI Designer often involves a progression towards design leadership or deep specialization. The emphasis on Design Systems and agile methodologies positions this role as integral to the operational efficiency of product development, offering a strong foundation for growth within product-focused organizations.

🌐 Work Environment

Office Type: The role is described as "On-site" in Paris, implying a traditional office environment. NEXTON's description as a blend of consulting, factory, and ESN suggests a professional, collaborative, and dynamic office setting designed to foster innovation and teamwork.

Office Location(s): Paris, France. This major European capital offers a vibrant professional ecosystem, excellent public transportation, and a high quality of life. Specific office details would need to be confirmed, but Parisian offices typically offer modern amenities and collaborative workspaces.

Workspace Context:

• Collaborative Spaces: The agile team structure and emphasis on cross-functional collaboration suggest an office designed with meeting rooms, breakout areas, and open spaces conducive to teamwork and idea sharing.

• Tools & Technology: Access to industry-standard design tools like Figma, along with other necessary software and hardware for high-fidelity design and prototyping. The provision of a latest-generation smartphone further supports connectivity and mobile-focused work.

• Team Interaction: Opportunities for daily interaction with UX designers, product owners, developers, and business stakeholders, facilitating rapid feedback loops and integrated problem-solving.

Work Schedule: Standard full-time hours (40 hours/week) are expected, with the potential for flexibility within the agile framework to accommodate project deadlines and team needs. This balance allows for dedicated focus time on design tasks while maintaining responsiveness to team activities.

📝 Enhancement Note: The on-site nature of the role in Paris suggests a focus on in-person collaboration, which is often beneficial for complex design challenges and building strong team dynamics. The professional environment at NEXTON is likely geared towards supporting innovation and client delivery.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: A review of your CV and portfolio to assess qualifications and alignment with the role's requirements.

• Technical Interview / Portfolio Review: A deep dive into your portfolio, discussing specific projects, your design process, Figma proficiency, and how you've applied Design Systems and handled mobile-first challenges. Expect to present case studies.

• Team / Cultural Fit Interview: Meeting with the Lead Design and potentially other team members (UX, PO) to assess your collaboration style, problem-solving approach, and fit with NEXTON's culture and agile team dynamics.

• HR / Final Interview: Discussion on compensation, benefits, career aspirations, and final confirmation of fit.

Portfolio Review Tips:

• Curate Selectively: Choose 3-4 of your strongest mobile-first UI design projects that best showcase your skills in Figma, Design Systems, and creating high-fidelity interfaces.

• Tell a Story: For each project, clearly articulate the problem, your role, your design process, the solutions you implemented, and the impact of your work. Use visuals effectively.

• Highlight Figma Mastery: Be prepared to demonstrate your Figma skills, including complex auto-layout usage, component variants, and how you manage Design Systems within the tool.

• Emphasize Process: Detail your workflow, especially how you collaborate with UX designers and developers, and how you ensure visual consistency and adhere to technical constraints.

• Prepare for Q&A: Anticipate questions about your design decisions, how you handle feedback, challenges faced, and your understanding of mobile UI best practices and accessibility.

Challenge Preparation:

• Design Challenge: You might be given a small design challenge or asked to critique an existing interface, focusing on mobile-first principles and Design System application.

• Problem-Solving: Be ready to discuss how you would approach a given design problem, outlining your steps and considerations.

• Communication: Practice articulating your thoughts clearly and concisely, especially when discussing technical aspects of UI design and your process.

📝 Enhancement Note: The interview process is designed to thoroughly assess both technical UI design skills and the candidate's ability to integrate into a professional, agile team. A strong, well-curated portfolio that clearly demonstrates Figma proficiency and adherence to design system principles will be critical for success.

🛠 Tools & Technology Stack

Primary Tools:

• Figma: This is the core design tool mentioned, with an expectation of mastery for design, component creation, auto-layout, and collaborative workflows.

• Prototyping Tools: Beyond Figma's native capabilities, other prototyping tools might be used, but Figma is the primary focus.

Analytics & Reporting:

• While not explicitly mentioned for the UI Designer role, understanding how design impacts user behavior tracked by analytics tools (e.g., Google Analytics, Amplitude, Mixpanel) is beneficial for data-informed design decisions. CRM & Automation:

• Not directly relevant to the UI Designer's daily tasks, but an understanding of how design contributes to user journeys within CRM or marketing automation platforms can add value. Design System Management Tools:

• Figma serves as the primary platform for managing Design Systems and component libraries.

📝 Enhancement Note: Proficiency in Figma is non-negotiable. The emphasis on Design Systems implies a need for organized and scalable design practices, where Figma acts as the central hub for all UI assets and guidelines.

👥 Team Culture & Values

Operations Values:

• Excellence in Design: A commitment to high-quality, visually appealing, and user-friendly interfaces.

• Collaboration: Strong emphasis on teamwork and cross-functional partnerships within agile teams.

• Innovation: Encouraging creative solutions and embracing new digital strategies.

• Efficiency: Utilizing Design Systems and agile methodologies to streamline the design and development process.

• User-Centricity: Prioritizing the end-user experience in all design decisions.

Collaboration Style:

• Agile Integration: Working seamlessly within agile sprints, participating in ceremonies, and adapting to iterative development cycles.

• Cross-functional Synergy: Close partnership with UX Designers, Product Owners, Business Analysts, and Developers to ensure alignment and achieve shared goals.

• Feedback-Driven: Openness to feedback from team members and stakeholders, and the ability to iterate on designs based on constructive input.

• Knowledge Sharing: Active participation in internal communities and meetups to share expertise and learn from peers.

📝 Enhancement Note: NEXTON's culture appears to value a blend of technical expertise, collaborative spirit, and a commitment to delivering innovative digital solutions. The focus on agile and cross-functional teams suggests an environment where designers are integral to the product development lifecycle, not just isolated contributors.

⚡ Challenges & Growth Opportunities

Challenges:

• Complex Project Environment: Navigating the demands of a strategic project within a large banking/digital client, requiring a balance of creative design and strict adherence to guidelines.

• Maintaining Consistency: Ensuring visual and UI consistency across a complex mobile application with potentially diverse features and user flows.

• Agile Adaptation: Seamlessly integrating design workflows into fast-paced agile sprints, managing feedback and revisions efficiently.

• Technical Constraints: Designing effectively within the specific technical limitations and best practices of iOS and Android platforms.

Learning & Development Opportunities:

• Advanced Figma Techniques: Deepening expertise in Figma's advanced features for design, prototyping, and Design System management.

• Mobile UX Best Practices: Continuous learning on evolving trends and best practices in mobile user experience design.

• Design System Evolution: Contributing to the strategic development and expansion of the Design System.

• Accessibility Expertise: Developing deeper knowledge and practical application of digital accessibility standards.

• Industry Exposure: Gaining experience with a major client in the banking/financial sector, understanding its unique operational and regulatory landscape.

📝 Enhancement Note: This role offers significant opportunities for professional development within the specialized field of UI design, particularly for mobile applications and within complex organizational structures. The challenges presented are typical for senior roles in dynamic environments and provide fertile ground for skill enhancement.

💡 Interview Preparation

Strategy Questions:

• "Describe your process for designing a new mobile feature from concept to high-fidelity mockups, focusing on how you ensure mobile-first principles and visual consistency."

• "How do you approach defining and implementing micro-interactions to enhance user experience without compromising performance or accessibility?"

• "Walk us through a time you had to adapt your design based on technical constraints or feedback from developers. What was your approach and the outcome?" Company & Culture Questions:

• "What interests you about NEXTON and this specific role within a client project?"

• "How do you see your role contributing to an agile team's success, and how do you typically collaborate with Product Owners and Developers?"

• "Describe a situation where you had to champion a design decision. How did you present your case and what was the result?" Portfolio Presentation Strategy:

• Structure Your Narrative: For each project, clearly outline the challenge, your role, your design process, the solutions you implemented, and the measurable outcomes.

• Showcase Figma Proficiency: Be ready to share your screen and navigate through a Figma file, demonstrating your understanding of components, auto-layout, and Design System integration.

• Highlight Mobile-First & Design Systems: Emphasize projects where you've applied mobile-first thinking and actively contributed to or utilized a Design System.

• Focus on Impact: Quantify your contributions where possible (e.g., improved user engagement, reduced design debt, faster development cycles).

• Be Ready for Design Critiques: Prepare to discuss your design choices and defend them with user-centered reasoning and best practices.

📝 Enhancement Note: Interview preparation should focus on demonstrating not just design skills but also an understanding of operational efficiency through design systems, agile collaboration, and problem-solving within constraints. Your portfolio is your primary tool for showcasing these capabilities.

📌 Application Steps

To apply for this Senior UI Designer position:

• Submit your application through the provided SmartRecruiters link.

• Customize Your Resume: Tailor your resume to highlight your 7+ years of UI design experience, specifically mentioning mobile-first design, Figma mastery, Design System contributions, and experience in agile environments. Use keywords from the job description.

• Prepare Your Portfolio: Ensure your portfolio is up-to-date, showcases your strongest mobile-first UI design projects, and clearly demonstrates your Figma skills and understanding of Design Systems. Organize it for easy navigation and presentation.

• Practice Your Presentation: Rehearse presenting your portfolio projects, focusing on clear communication of your process, decisions, and impact. Be prepared to discuss your work in detail and answer technical questions.

• Research NEXTON: Familiarize yourself with NEXTON's services, client portfolio, and company culture. Understand their approach to digital transformation and innovation.

⚠️ 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.