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Mattéo JanssensMJ

Mattéo Janssens

Consultant Marketplace & Catalog Management

€300/day
Nice, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Mattéo

Want to start selling on marketplaces, or develop new ones, but afraid it will take you a lot of time?

That's exactly why I'm here.

I work daily on multi-marketplace catalog management: Amazon, Fnac, Cdiscount, Rakuten, eBay, ManoMano, Carrefour, Auchan, Leclerc, Boulanger, ADEO, Cultura, and others as needed.

Product sheet creation and optimization, EAN matching and validation, product feed structuring for brands with own references and private labels.

What I can do for you:

- Onboarding on a new marketplace
- Product sheet creation and optimization
- Catalog audit and cleanup: EAN, attributes, categorization
- Supplier EAN / marketplace catalog matching
- Product feed optimization and catalog exports
- Advice on marketplace selection and prioritization

For whom?

Brands, distributors, and e-retailers who want to accelerate their presence on marketplaces without getting bogged down in the technicalities.

Available for one-off, recurring, or long-term collaborations.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Omnibox
    Co-Founder
    March 2026 - Today (4 months)
    Co-founder of OmniBox, a B2B SaaS designed for multi-marketplace sellers. OmniBox centralizes all customer service messages from all platforms (Amazon, Fnac, Cdiscount, Rakuten, eBay, and others) into a single unified interface, with SLA alerts, response templates, and customer history. The goal: zero juggling between interfaces, zero missed customer messages.

    As Co-Founder, I drive commercial strategy and customer acquisition. This includes defining product positioning, building multi-channel prospecting sequences (LinkedIn and cold email), conducting discovery calls and prospect demos, and closing deals. I work closely with the other co-founder to integrate seller feedback into product development.
    Software as a Service (SaaS) Marketplaces E-commerce Marketplace Onboarding API Integration
  • MKstore
    Co-Business Manager
    September 2024 - Today (1 year and 10 months)
    Management and development of a sales activity on Amazon and Cdiscount marketplaces, based on supplier EAN matching. Integration and optimization of product catalogs, listing management, and monitoring of commercial performance on both platforms.
  • TravlyApp
    Founder
    April 2025 - March 2026 (11 months)
    Travlyapp was born during my Working Holiday in Australia, from a simple idea: helping backpackers find real job opportunities faster.

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Education

  • Python Data Structures Sales Hub de HubSpot Capstone: Retrieving, Processing, and Visualizing Data with Python Using Databases with Python Programming for Everybody
    Python Data Structures Sales Hub de HubSpot Capstone: Retrieving, Processing, and Visualizing Data with Python Using Databases with Python Programming for Everybody
  • Bachelor of Commerce - BCom
    Talis Business School
    2022
    Bachelor of Commerce - BCom

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