Product Designer Mobile Senior - F / H

📍 Job Overview

Job Title: Product Designer Mobile Senior - F/H

Company: Epsor

Location: Paris, France

Job Type: Full-time

Category: Product Design / UX/UI Design

Date Posted: May 05, 2026

Experience Level: Senior (5-8 years)

Remote Status: Hybrid (3 days in office, 2 days remote)

🚀 Role Summary

• Lead the end-to-end product design craft for Tuttim, a new employee benefits application, from user discovery through to high-fidelity delivery.

• Drive user research initiatives, including user interviews and data analysis, to inform design decisions and validate solutions.

• Develop and maintain a robust Design System, ensuring consistency across mobile (iOS/Android) and web platforms.

• Propose and implement innovative AI-driven design solutions to accelerate user research, prototyping, and developer handoff.

• Collaborate closely with Product Managers, Engineers, and Data teams to align on product strategy and ensure successful feature implementation.

📝 Enhancement Note: This role focuses on senior-level product design expertise within a growing fintech company, with a strong emphasis on mobile-first (iOS/Android) design, user-centric methodologies, and the integration of AI to enhance design processes and productivity. The role requires a blend of strategic thinking, hands-on execution, and cross-functional collaboration.

📈 Primary Responsibilities

• Spearhead the design process for the Tuttim application, encompassing user journey mapping, wireframing, prototyping, and high-fidelity UI design for both iOS and Android platforms.

• Conduct rigorous user research, including qualitative interviews and quantitative data analysis, to deeply understand user needs, pain points, and behaviors.

• Define and articulate user flows, interaction models, and information architecture to create intuitive and engaging user experiences.

• Contribute significantly to the evolution and maintenance of Epsor's Design System, ensuring adherence to established guidelines and identifying opportunities for enhancement.

• Actively participate in design critiques, providing and receiving constructive feedback to elevate the quality of design solutions.

• Collaborate with Product Managers to translate business requirements and user insights into actionable design specifications and detailed functional logic.

• Work closely with Engineering teams to ensure seamless design handoffs, providing clear documentation and support throughout the development lifecycle.

• Explore and experiment with AI tools and methodologies to optimize design workflows, enhance user research efficiency, and improve prototyping speed.

• Measure and analyze the impact of design decisions on key business and user metrics, iterating on designs based on performance data.

• Champion best practices in UX/UI design, accessibility, and mobile-first principles within the product and engineering teams.

📝 Enhancement Note: The primary responsibilities highlight a senior-level ownership of the design craft, emphasizing deep user understanding, strategic problem-solving, and a proactive approach to improving design processes and team efficiency. The inclusion of AI integration suggests a forward-thinking design team that values innovation.

🎓 Skills & Qualifications

Education: While no specific degree is mandated, a strong portfolio demonstrating equivalent practical experience and a deep understanding of design principles is essential.

Experience: 5-8 years of professional Product Design experience, with a minimum of 3 years focused on native mobile (iOS/Android) application production. Experience in a fintech, B2C, or scale-up environment is highly preferred.

Required Skills:

• Proven expertise in Product Design, with a strong portfolio showcasing end-to-end design projects.

• Extensive experience designing for native mobile platforms (iOS and Android), understanding platform-specific conventions and constraints.

• Proficiency in user research methodologies, including user interviews, surveys, and usability testing, to gather actionable insights.

• Advanced skills in wireframing, prototyping, and creating high-fidelity mockups using industry-standard design tools such as Figma.

• Experience in developing and maintaining Design Systems to ensure product consistency and scalability.

• Ability to translate complex business requirements and user needs into clear, effective design solutions.

• Strong understanding of UI/UX principles, accessibility standards, and responsive design best practices.

• Demonstrated ability to defend design choices with data, user feedback, and logical reasoning.

• Excellent communication and collaboration skills, with experience working effectively in cross-functional teams.

Preferred Skills:

• Experience in the Fintech industry, with an understanding of security, trust, and accessibility considerations.

• Experience with AI-driven design tools and their application in user research and prototyping.

• Familiarity with FigJam or similar collaborative whiteboarding tools.

• Experience in B2C product design, with a focus on user engagement and retention.

• Understanding of web design principles and cross-platform design consistency.

• Experience in a scale-up environment, demonstrating adaptability and ability to contribute to evolving processes.

• Knowledge of product analytics tools and their application in design iteration.

📝 Enhancement Note: The qualifications emphasize practical experience and a demonstrable track record in mobile product design. The preference for fintech and scale-up experience, along with AI proficiency, indicates a specific need for candidates who can navigate complex, fast-paced environments and embrace innovative tools.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase a minimum of 2-3 comprehensive case studies demonstrating end-to-end product design processes for native mobile (iOS/Android) applications.

• Clearly articulate the problem statement, your role, the design process undertaken (research, ideation, prototyping, testing, iteration), and the final solution.

• Highlight specific contributions to user research, including methodologies used and key insights gained.

• Detail the creation or contribution to a Design System, illustrating its impact on consistency and efficiency.

• Include examples of how data and user feedback were used to inform design decisions and measure impact.

Process Documentation:

• Provide evidence of how you have documented design processes, including user journey maps, flow diagrams, and functional specifications.

• Showcase examples of design critiques and how feedback was incorporated into iterative design improvements.

• Illustrate methods used for design handoff to development teams, ensuring clarity and efficiency.

• Include examples of how you have measured the impact of your design solutions using relevant metrics.

📝 Enhancement Note: A strong portfolio is critical for this role, as it serves as the primary evidence of a candidate's design capabilities, process maturity, and ability to deliver impactful mobile experiences within a regulated industry like fintech. The emphasis on process documentation and measurable impact is key.

💵 Compensation & Benefits

Salary Range: €55,000 - €65,000 annually.

Benefits:

• Annual Profit-Sharing Bonuses: Between €2,000 and €9,000, depending on company performance and objective achievement (e.g., €5,000 in 2025).

• Mandatory Retirement Savings Plan (PER): Funded by Epsor, providing long-term financial security.

• Swile Restaurant Card: €9 per day worked, contributing to daily meal expenses.

• Navigo Pass Reimbursement: 50% coverage for public transport, or a sustainable mobility bonus.

• Team Events: Participation in engaging team-building activities, seminars, and after-work gatherings.

• B Corp Culture: Working within a company committed to strong social and environmental values.

• Positive Impact: Opportunity to contribute to the financial well-being of thousands of employees.

Working Hours: Standard full-time work hours (approximately 40 hours per week), with flexibility for 2 days of remote work per week.

📝 Enhancement Note: The salary range is competitive for a Senior Product Designer role in Paris, especially within the fintech sector. The comprehensive benefits package, including profit-sharing and retirement plans, reflects Epsor's commitment to employee well-being and long-term engagement. The hybrid work model offers a good balance between in-office collaboration and remote flexibility.

🎯 Team & Company Context

🏢 Company Culture

Industry: Fintech, Employee Savings & Retirement Solutions. Epsor operates in a rapidly evolving financial technology sector, focused on making savings and retirement planning more accessible, transparent, and responsible.

Company Size: Epsor is a scale-up, indicated by its significant client and user base (2,500 clients, 250,000 users) and €3 billion in assets under management. This size suggests a dynamic environment with established processes but still room for agility and individual impact.

Founded: Founded in 2017, Epsor has quickly established itself as a key player in the employee savings and retirement market, ranking among the top 10 actors. This rapid growth indicates a strong product-market fit and an innovative approach.

Team Structure:

• The Product & Tech team consists of over 30 individuals, including Product Managers, Product Designers, Engineers, and Data specialists.

• The Senior Product Designer will report to Louis, the Head of Design, and will work closely with Product Managers and Engineers on the Tuttim product.

Methodology:

• Data-Driven Design: Emphasis on using user feedback, interviews, and data analytics to inform design decisions and validate solutions.

• Agile Development: Likely follows agile principles for iterative development and rapid deployment of features.

• Design System Centric: Commitment to building and leveraging a Design System for consistency and efficiency across platforms.

• User-Centric Approach: Prioritizing user needs and experience throughout the product development lifecycle.

Company Website: https://epsor.fr/ and https://tuttim.com/

📝 Enhancement Note: Epsor's culture is shaped by its mission, its B Corp certification, and its rapid growth in the fintech space. The emphasis on transparency, responsibility, and employee well-being is likely reflected in its internal operations and team dynamics. The hybrid work model and focus on a collaborative product team suggest a modern, employee-centric work environment.

📈 Career & Growth Analysis

Operations Career Level: This is a Senior Product Designer role, indicating a level of expertise and autonomy. The individual is expected to lead design initiatives, mentor junior designers (if applicable), and significantly influence product strategy and execution. The scope includes ownership of key product areas, particularly the Tuttim application.

Reporting Structure: The role reports to the Head of Design (Louis), providing clear guidance and mentorship. Collaboration is expected with Product Managers, Engineers, and Data teams, fostering cross-functional influence and visibility.

Operations Impact: The Senior Product Designer will have a direct impact on the user experience and adoption of Tuttim, Epsor's new comprehensive employee benefits application. Success in this role translates to improved user engagement, satisfaction, and ultimately, the company's market position and revenue growth in the competitive fintech landscape. The role also contributes to shaping the overall design strategy and standards within the organization.

Growth Opportunities:

• Design Leadership: Potential to grow into a Lead Product Designer or Design Manager role as the team expands.

• Specialization: Opportunity to deepen expertise in mobile design, fintech UX, or AI-driven design processes.

• Cross-Functional Development: Gaining broader product management and technical understanding through close collaboration.

• Process Innovation: Leading initiatives to improve design processes, tooling, and team efficiency.

• Mentorship: Opportunity to mentor junior designers and contribute to building a strong design culture.

📝 Enhancement Note: The Senior Product Designer role offers significant opportunities for career advancement within Epsor, particularly for individuals looking to take on more leadership responsibilities or specialize in cutting-edge areas like AI in design. The company's growth trajectory suggests a fertile ground for professional development.

🌐 Work Environment

Office Type: The role is based in Paris, with a hybrid work arrangement allowing 2 days of remote work per week. This suggests a modern office environment designed for collaboration and focused work, complemented by the flexibility of remote working.

Office Location(s): The office is located at 66 Rue de Rome, 75008 Paris, in a central business district, likely offering good accessibility via public transport.

Workspace Context:

• Collaborative Spaces: The office likely features meeting rooms, breakout areas, and open spaces conducive to teamwork and brainstorming sessions with Product Managers, Engineers, and other designers.

• Tools & Technology: Access to standard design software (Figma, FigJam), collaboration tools, and potentially advanced AI design tools. The company is actively exploring AI for design productivity.

• Team Interaction: Regular opportunities for in-person interaction with the Head of Design, Product Managers, and the wider Product & Tech team, fostering a strong team dynamic.

Work Schedule: The role adheres to a standard full-time schedule (approx. 40 hours/week), with the hybrid model providing flexibility. This structure allows for dedicated time for deep work, collaborative sessions, and personal well-being.

📝 Enhancement Note: The hybrid work model in a central Paris location balances the benefits of in-office collaboration and team cohesion with the flexibility of remote work, catering to modern professional expectations. The environment is geared towards innovation and efficient execution within the fintech sector.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Call with Head of Design (Louis): Focus on understanding your background, design philosophy, and alignment with the role's core responsibilities and Epsor's culture. Be prepared to discuss your motivations and career aspirations.

• HR Video Call: A general screening to assess cultural fit, expectations regarding compensation, and logistical aspects of the role.

• Live Case Study with the Team: This is a critical stage. You will likely be given a design challenge (related to mobile or Tuttim) to solve live or prepare beforehand and present. Focus on articulating your thought process, user-centric approach, and problem-solving skills. Be ready to discuss trade-offs and justify your decisions.

• Meeting with CPO (Arnaud): A final discussion, likely more strategic, focusing on your understanding of product vision, leadership potential, and alignment with the company's broader product strategy.

Portfolio Review Tips:

• Curate Strategically: Select 2-3 strong mobile-focused case studies that best represent your senior-level experience and align with Epsor's product (fintech, B2C, employee benefits).

• Emphasize Process: Clearly detail your design process, from user research and problem definition to solution ideation, prototyping, testing, and iteration. Use visuals to illustrate each stage.

• Quantify Impact: Where possible, include metrics or evidence demonstrating the positive impact of your designs on user behavior or business goals.

• Showcase Mobile Expertise: Highlight specific challenges and solutions related to iOS and Android design.

• Design System Contribution: If applicable, include examples of your work on design systems.

• AI Integration: If you have relevant experience, showcase how you've used AI tools to enhance your design workflow.

• Be Ready to Discuss: Prepare to walk through your portfolio and answer in-depth questions about your decisions and rationale.

Challenge Preparation:

• Understand Tuttim: Research Epsor and Tuttim thoroughly. Understand their mission, target audience, and competitive landscape.

• Mobile-First Thinking: Practice designing for mobile constraints and opportunities. Consider common mobile UX patterns.

• Problem-Solving Framework: Have a structured approach to tackling design challenges, focusing on user needs first.

• Data & Feedback: Be prepared to discuss how you incorporate user feedback and data into your design process.

• AI Applications: Think about how AI could be used to improve user research, prototyping, or developer handoff in a fintech context.

📝 Enhancement Note: The interview process is designed to assess not only design skills but also problem-solving abilities, collaborative potential, and strategic thinking. A well-prepared portfolio and thoughtful approach to the live case study are crucial for success.

🛠 Tools & Technology Stack

Primary Tools:

• Figma: The core design tool for UI design, prototyping, and collaboration. Proficiency is essential.

• FigJam (or similar): For ideation, whiteboarding, user journey mapping, and collaborative sessions.

• Sketch: While Figma is primary, familiarity with Sketch can be beneficial given its historical prevalence.

• Prototyping Tools: Advanced prototyping capabilities within Figma, or potentially dedicated tools if used for specific complex interactions.

• AI Design Tools: Epsor is actively seeking candidates who can leverage AI for user research, prototyping, and developer handoff. Familiarity with emerging AI tools in the design space is a plus.

Analytics & Reporting:

• User Research Platforms: Tools for conducting user interviews, surveys, and usability tests (e.g., UserTesting, Typeform, Lookback).

• Product Analytics Tools: Familiarity with tools like Mixpanel, Amplitude, or Google Analytics to understand user behavior and measure design impact.

• Data Visualization Tools: Ability to interpret data presented in dashboards or reports from tools like Tableau or Power BI.

CRM & Automation:

• Project Management Tools: Tools like Jira, Asana, or Trello for managing design tasks and tracking progress within Agile workflows.

• Collaboration Platforms: Slack or Microsoft Teams for day-to-day communication and team coordination.

• Design System Management Tools: Potentially specialized tools or components within Figma for managing and documenting design system elements.

📝 Enhancement Note: Proficiency in Figma is non-negotiable. The emphasis on AI tools indicates a forward-looking approach to design technology, and candidates with experience in this area will be highly valued. Familiarity with tools supporting user research and analytics will further strengthen an application.

👥 Team Culture & Values

Operations Values:

• Collective & Trust: Epsor emphasizes a strong sense of teamwork and mutual trust, fostering an environment where individuals feel supported and empowered. This is reflected in their B Corp status and commitment to transparency.

• User-Centricity: A deep commitment to understanding and serving the needs of both end-users (savers) and corporate clients, driving product decisions through empathy and data.

• Responsibility & Impact: A focus on guiding savers for a better tomorrow, aligning business objectives with positive societal and financial impact. This translates to a thoughtful approach to product development.

• Efficiency & Innovation: Encouraging experimentation with new processes and technologies, such as AI, to drive efficiency and continuously improve product offerings and internal workflows.

• Transparency: A core value in their mission and likely reflected in internal communications and decision-making processes.

Collaboration Style:

• Cross-functional Integration: Designers work closely with Product Managers, Engineers, and Data teams, forming integrated product squads focused on specific features or areas.

• Open Communication: Encouraging direct and honest feedback through design reviews, team meetings, and informal discussions.

• Shared Ownership: Fostering a sense of collective responsibility for product success, where everyone contributes to problem-solving and decision-making.

• Process Improvement: Actively seeking opportunities to refine team rituals, collaboration methods, and handoff processes to enhance productivity and effectiveness.

📝 Enhancement Note: Epsor's culture appears to be a blend of mission-driven purpose, collaborative spirit, and a pragmatic approach to innovation within the fintech sector. Candidates who thrive in environments that value both impact and efficiency will likely find a good fit.

⚡ Challenges & Growth Opportunities

Challenges:

• Balancing User Needs with Business Constraints: As a fintech company, there are significant demands for security, compliance, and scalability, which can sometimes conflict with ideal user experiences. The challenge lies in finding optimal trade-offs.

• Integrating AI Effectively: Successfully implementing and scaling AI tools within the design workflow requires careful planning, experimentation, and change management. Ensuring AI enhances rather than complicates the process is key.

• Cross-Platform Consistency: Maintaining a cohesive and high-quality user experience across mobile (iOS/Android) and web platforms, especially with a growing Design System, requires constant vigilance and strategic updates.

• Rapid Growth Environment: Navigating the complexities of a scale-up environment, where processes are evolving and new challenges emerge frequently, requires adaptability and resilience.

Learning & Development Opportunities:

• AI in Design Specialization: Deepening expertise in leveraging AI for user research, generative design, prototyping, and workflow automation.

• Fintech UX Mastery: Gaining specialized knowledge in designing for financial products, focusing on trust, security, and complex user journeys.

• Design Leadership Skills: Developing skills in mentoring, team management, and strategic design planning through working with the Head of Design and CPO.

• Product Strategy Contribution: Influencing the strategic direction of the Tuttim product and contributing to broader product initiatives.

• Industry Exposure: Potential opportunities to attend industry conferences or workshops related to UX, fintech, or AI.

📝 Enhancement Note: The challenges presented are typical of dynamic fintech scale-ups and offer significant learning opportunities. The company's focus on AI and its mission-driven nature provide avenues for specialized growth and impactful contributions.

💡 Interview Preparation

Strategy Questions:

• "How would you approach designing a new feature for Tuttim that aims to increase user engagement with retirement planning tools?" (Focus on your process: research, ideation, validation, and metrics.)

• "Describe a time you had to defend a design decision against stakeholder pushback. What was your strategy, and what was the outcome?" (Highlight your ability to use data and user insights to justify choices.)

• "How can AI be leveraged to improve the user research process for a mobile application like Tuttim? Provide specific examples." (Demonstrate your understanding of AI applications in design.)

Company & Culture Questions:

• "What interests you about Epsor's mission and our B Corp status?" (Connect your values to the company's purpose.)

• "How do you approach collaboration within a cross-functional product team, particularly with Product Managers and Engineers?" (Emphasize your teamwork and communication skills.)

• "Given our focus on transparency and trust in fintech, how do you ensure these values are reflected in your designs?" (Show your understanding of the industry and ethical design considerations.)

Portfolio Presentation Strategy:

• Structure for Impact: For each case study, clearly state the problem, your role, the solution, and the outcome. Use a narrative flow that guides the interviewer through your thought process.

• Highlight Mobile Specifics: Dedicate specific points to how you addressed iOS and Android conventions, performance, and user interactions.

• Showcase Data & Research: Visually present user research findings, usability test results, and any data analytics that informed your decisions. Explain why these insights mattered.

• Demonstrate Design System Use/Contribution: If applicable, show how you applied or contributed to a design system, explaining its benefits.

• Explain AI Integration (if any): Clearly articulate how AI tools were used, the benefits achieved, and any challenges encountered.

• Be Prepared for Deep Dives: Anticipate detailed questions about specific design choices, trade-offs, and alternative solutions you considered.

📝 Enhancement Note: Preparation should focus on demonstrating a senior-level understanding of mobile product design, a strong user-centric methodology, and an innovative mindset, particularly regarding AI. Articulating your process and the impact of your work will be key.

📌 Application Steps

To apply for this Product Designer Mobile Senior position:

• Submit your application through the provided link on the Epsor Teamtailor platform.

• Curate Your Portfolio: Select 2-3 impactful case studies that specifically highlight your senior-level mobile (iOS/Android) design experience, user research capabilities, and any work related to design systems or AI. Ensure each case study clearly outlines the problem, your process, your role, and the measurable outcomes.

• Tailor Your Resume: Emphasize keywords from the job description, such as "Product Design," "Mobile Native," "User Research," "Figma," "Design System," "Fintech," and "AI." Quantify your achievements wherever possible.

• Prepare for the Case Study: Research Epsor and Tuttim thoroughly. Practice articulating your design process and decision-making rationale, especially in relation to user needs, business goals, and technical constraints. Be ready to present your portfolio and discuss your design philosophy.

• Research Epsor's Mission & Values: Understand their "entreprise à mission" status, B Corp certification, and commitment to responsible savings. Be prepared to discuss how your values align with theirs during interviews.

⚠️ 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.