Daniel César Vieira
Verified Expert in Design
Designer
Paris, France
Toptal member since March 29, 2026
I design AI-powered products where users must trust the output: explainable recommendations, clear decision flows, and interfaces built on research and data. 20 years of experience, from Sanofi (AI strategic intelligence platform) to Sony Music, Younited Credit, Leetchi and Chugai Pharma. I help healthtech and fintech teams raise adoption, conversion and retention, and I’m available for a mission starting now.
Experience
- Ergonomic Testing - 20 years
- Data Visualization Tools - 20 years
- Design - 20 years
- Prototyping - 20 years
- HCI Frameworks - 20 years
- Digital Prototyping - 16 years
- Figma - 8 years
- AI Design - 3 years
Portfolio
Sanofi: AI-driven Strategic Intelligence Platform & Global CX Roadmap
Chugai Pharma: Accelerating Clinical Trials through User-Centric Digital Solutions
Younited Credit: Scaling Instant Credit Solutions through Conversion-Focused UX
Moniwan: Redesigning the Digital Investment Experience for Real Estate Assets
Sony Music Ecosystem: UX Strategy & Web Player Launch
Data Legal Drive: Scaling a Leading LegalTech SaaS for GDPR Governance
Work Experience
Senior CX & AI Strategist
Sanofi
- Architected an AI-driven CX roadmap for global digital platforms, aligning multi-stakeholder requirements with GxP and HIPAA regulatory standards.
- Spearheaded the digital design strategy, showcasing Sanofi's commitment to AI-driven drug discovery and clinical trial efficiency.
- Leveraged Harvard and Stanford strategic frameworks to conduct complex user research, transforming deep data insights into intuitive healthcare interfaces.
- Collaborated in standardizing a global design system used by multiple product teams, ensuring brand consistency and accelerating time-to-market for new patient tools.
Senior Product Designer & Strategy Consultant
Theodo - Chugai Pharma, Younited Credit, Leetchi, Moniwan
- Delivered end-to-end product design for high-stakes clients, including Chugai Pharma Moniwan and Younited Credit, focusing on conversion and complex user flows.
- Led the UX overhaul for Leetchi (fintech), resulting in a measurable increase in user retention and simplified money collection processes.
- Facilitated design sprint workshops for executive-level stakeholders, aligning product vision with rapid prototyping and user testing validation.
- Optimized mobile-first interfaces for high-traffic fintech applications, ensuring AA accessibility standards and seamless cross-platform experiences.
Co-Founder & CTO | Head of Product Design
Ilycoach (L'Entrepreneuriat & CTO-level)
- Co-founded and scaled a workplace wellness platform from an MVP to a market-leading SaaS solution featured on M6 National TV.
- Engineered the end-to-end user experience for mobile (iOS/Android) and web platforms, resulting in a 30% increase in user engagement within the first 6 months.
- Managed a multidisciplinary team of developers and wellness experts, ensuring technical feasibility and high-fidelity design alignment.
- Conducted extensive usability testing and iterative prototyping to validate product-market fit, securing key corporate accounts (B2B).
- Architected an innovative management dashboard for HR departments, streamlining the organization of corporate wellness workshops.
Senior Product Designer (Lead UX/UI)
Richard Bliah Associates (Tokyo)
- Led digital design initiatives for high-end architectural projects, integrating interactive UX into complex presentation workflows.
- Developed custom digital tools to enhance project communication, facilitating alignment between international stakeholders and local teams.
- Synthesized Japanese design precision with Western user-centric methodologies to deliver refined, high-impact visual assets.
- Streamlined the architectural design-to-presentation process, reducing revision cycles by 25% through improved digital clarity.
- Presented strategic design solutions to C-level international clients, ensuring project vision was articulated through intuitive interfaces.
Product Designer (UX/HCI Researcher)
CNRS (National Center for Scientific Research)
- Transformed complex scientific research data into practical, user-centered software applications for the national research community.
- Designed ergonomic interfaces for specialized scientific tools, significantly improving the accuracy and speed of data entry for researchers.
- Collaborated with multidisciplinary teams of scientists and engineers to prototype functional solutions for Human-Computer Interaction (HCI).
- Applied cognitive psychology principles to the design process, ensuring high accessibility and usability for advanced technical software.
- Contributed to the strategic vision of research-driven products, bridging the gap between theoretical science and practical digital tools.
Product Designer (Digital & Interface)
Richard Bliah Associates (Tokyo)
- Conceptualized high-fidelity visual assets and digital interfaces for prestige architectural projects in a multicultural Tokyo-based environment.
- Integrated digital design into the firm's presentation workflows, significantly improving the clarity and impact of communication for global stakeholders.
- Collaborated directly with senior architects to translate complex structural data into intuitive graphic renderings and interactive experiences.
- Mastered Japanese-standard precision and quality control methodologies, ensuring 100% accuracy in high-stakes international design deliverables.
- Optimized the digital communication process between the Tokyo office and Western clients, bridging cultural and technical gaps through effective UX.
Education
Associate Degree in Visual Design
EESA - European Superior School of Animation - Paris
Certifications
AI-Driven Leadership: Strategies for the Future
Stanford Online
Structure and Function of Argument: Introduction to Critical Thinking
Harvard University
Skills
Tools
Auto Layout, Tokens Studio, FigJam, Figma Make, Jira, Confluence, Miro, Zeroheight, Claude, Hotjar, Adobe Creative Suite, 3ds Max
Platforms
Figma, Mixpanel, iOS, Android, Firebase
Other
Design, System Design, Prototyping, Digital Prototyping, Mobile App Design, HCI Frameworks, Data Visualization Tools, Ergonomic Testing, UX Design, User Experience (UX), User Interface (UI), Visual Design, Web Design, Web App UX, UI Design, Brand Design, Brand Identity, Brand Logos, Branding, Color Palettes, Digital Brand Identity, Digital Typography, Graphic Design, Logo Design, Typography, B2B, Interaction Design (IxD), Product Design, Mobile Design, Responsive UX Design, UI Components, UI Prototyping, UX Prototyping, Wireframing, Pitch Deck Design, Generative AI Management & Implementation, Research & Critical Thinking, AI Design, Brand Guidelines, Conversion Rate, Accessibility, Web Accessibility, Predictive Analytics Management, Organizational Culture & Leadership, Storybook, ChatGPT, Notion, Cursor AI, React, Agile, Scrum, Lean Startups, Interactive Visualizations, Digital Prototyping Tools, Evidence-Based Design, Quantitative Research, Usability Testing (SUS), Product Launch, High-Performance UI, Data-driven Design, AI Product Strategy, Generative Artificial Intelligence (GenAI), Product Strategy Consultant, Clinical Trials (eCOA/ePRO), User-Centric Design (UCD), Governance, Information Architecture (IA), SaaS Design, B2B Product Strategy, Dashboard Design, Conversion Rate Optimization (CRO), Fintech, Open Banking Integration, User Journey Maps, A/B Testing, Financial Services, B2C Fintech, Investment UX, Design Systems, Customer Experience, Wealth Management, Financial Calculators
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