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Xavier TomaszewskiXT

Xavier Tomaszewski

Senior Product Designer DataViz B2B/B2E

€750/day
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Xavier

With a background in product management, I have specialized in recent years in the design of complex, data-oriented B2B products.

I support teams in user research, product strategy, and design to structure decision-making and deliver high-impact solutions.

With comprehensive experience, good interpersonal skills, and clear, well-reasoned structures, I bring forth clear product directions.
  • French

    Native or bilingual

  • English

    Fluent

  • Spanish

    Conversational

  • Polish

    Conversational

Can work on-site
Paris (up to 10km)

Experience

  • ENGIE - GEMS
    Senior Product Designer
    ENERGY AND UTILITIES
    April 2024 - Today (2 years and 2 months)
    Colombes, France
    Overhaul of gas flow trading and optimization tools (GemStar program)

    Intervention within the GEMS business unit in a context of transformation of internal tools, historically developed without structured product practices, for expert users (dispatchers, traders, schedulers).

    Activities
    • Facilitation: definition of the product vision and 3-year strategy for the overhaul program/definition of new key concepts and new business processes.
    • In-depth mapping of complex business processes (user flows, experience maps, service blueprints)
    • Design of systems for managing and visualizing critical real-time data (statuses, events, flows)
    • Definition of data prioritization and filtering logic to reduce cognitive load in high operational intensity contexts
    • Support for product delivery and solution validation
    • Leading a cross-functional initiative to improve product practices (internal interviews, friction identification, structured action plan)

    Impact
    • Significant reduction in operational errors through better visibility of critical statuses and events
    • Significant time savings on scheduling operations through nomination automation (3 hours per shift vs. 20 minutes)
    • Improved real-time decision-making for optimization and trading teams
    • Structuring of a sustainable product approach in an initially under-equipped environment
    • Alignment of business, product, and management teams around a clear and shared product vision
    Data visualisation Product management Product vision Product Ops Product designer
  • CARREFOUR
    Product Designer
    RETAIL (LARGE RETAILERS)
    April 2023 - Today (3 years and 2 months)
    Paris, France
    Design of a data product enabling industrial partners to analyze their product performance and drive business decisions based on retail data.

    Activities
    • Analysis of user mental models to define navigation and reading models adapted to analytical uses.
    • Structuring complex data into actionable and decision-oriented interfaces.
    • Facilitation of cross-functional workshops (design, product, data) to define data hierarchy and visualization strategies.
    • Design of filtering and exploration logic to facilitate analysis and insight identification.
    • Creation of prototypes tested with users to validate readability and analytical relevance.
    • Design of a comprehensive experience for monitoring brand performance across the Carrefour distribution network.

    Impact
    • Improved data readability and usability, facilitating faster and more reliable decision-making.
    • Alignment of product, design, and data teams around decisions based on user needs.
    • Clarification of navigation and filtering logic in a complex data product.
    • Implementation of a structured research repository to capitalize on and disseminate user knowledge.
    Data visualisation UI/UX Design User Research
  • Thiga
    Design Manager
    CONSULTING AND AUDITS
    June 2019 - March 2024 (4 years and 9 months)
    Île-de-France, France
    Consulting firm specializing in Product Management, Product Design, and Product Marketing.

    Joined in 2019 as a Product Manager, I contributed to several missions in various product contexts and then evolved to a Product Designer role, developing skills in user experience, discovery, and product design.

    Subsequently, I took on management responsibilities, overseeing a team of eight consultants, supporting them in their progression and career development.

    In parallel, I also contributed as a trainer at Thiga Academy, leading Product Management training sessions and sharing best practices. This experience has allowed me to build a hybrid profile, at the intersection of product, design, and management, specializing in complex B2B/B2E products.
    Team management Training facilitation Product management Lead product designer

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Education

  • Master in Marketing and Sales Team Management
    ISEM Montpellier
    2016
    Master en Marketing et Gestion d'Équipes Commerciales , Mangement
  • Law Degree
    FACO Paris
    2014
    Licence, Droit

Skill set

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