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Matthieu HelaryMH

Matthieu Helary

Product Manager

€650/day
Lille, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Matthieu

10+ years building, managing, and scaling eCommerce and SaaS products with measurable business impact. Operational approach: I write SQL, develop integrations with AI, and manage end-to-end.

What I've done:

  • 10x revenue growth in 6 years through conversion optimization (+15%), loyalty, and technical transformation
  • Technical leadership: Full migration to composable architecture (500+ APIs), development of a quasi-SaaS WMS (7 warehouses, 200 users), 8 mobile apps deployed
  • Operational excellence: 430K orders/year, 98% on-time shipping, -11% logistics costs, $1M annual savings
  • Impact management: Led 40 people (PMs, Designers, Tech, Ops) internationally with internal promotions
  • First PM: Established the product function from scratch with vision, OKRs, agility, and a complete data stack

What I do concretely:

  • Develop integrations (Supabase, APIs) and rapid prototyping with AI
  • Write functional specifications in Gherkin to accelerate production
  • Advanced SQL queries for analytics and automated monitoring
  • Manage technical tenders and architecture transformations
  • Facilitate Agile rituals and obtain stakeholder buy-in

Stack:

Magento, Symfony, Headless Commerce • API-first Architecture • OMS, WMS, PIM • Supabase, Snowflake, Fivetran • Databox, Amplitude, PostHog • Linear, Notion, Slack • iOS/Android • Agile/Scrum
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Gosto
    Director of Product & Tech
    E-COMMERCE
    June 2025 - Today (1 year and 2 months)
    Lille, France
    First product hire in a fast-growing scale-up. Established the product function from scratch with a hands-on approach combining strategic vision and technical execution.
    Key achievements:

    Defined product vision and implemented the OKR framework
    Implemented agility and adopted Linear for product/tech management
    Personally developed an Attio ↔ ERP integration with Supabase and AI

    Missions - Conversion funnel optimization:

    Acquisition: Launched a Growth strategy with B2B Lead Generation
    Conversion: Managed a tender for the redesign of 20 eCommerce sites to a unified headless stack
    Closing: Optimized the conversion rate of quotes to asynchronous for smoother ADV work
    Logistics: Wrote functional specifications for the creation of a custom WMS

    Tools and Operations:

    Data structuring: complete architecture with Fivetran, Snowflake, and Databox
    Deployed Slack as the central communication tool
    Monitored and tested innovative solutions (Basedash, Julius AI) to optimize workflows
    Rapid prototyping and development with AI to validate business needs

    Technical environment:
    Headless Commerce • Supabase • Fivetran, Snowflake • Attio • Databox • Linear • Basedash • Julius AI • Slack • PostHog • Agile/Scrum
  • Saveur Bière | PerfectDraft | ABInBev
    Head of Product
    E-COMMERCE
    March 2017 - May 2025 (8 years and 2 months)
    Lille, France
    Full product management of a multi-country eCommerce platform with end-to-end management of technological transformations, the product team, and user experience.
    Key achievements:

    Led a team of 9 people (5 PMs + 4 designers) in person and remotely abroad
    Multi-country management: 8 websites in multiple languages with local adaptations (language, currency, content)
    Technical transformation: migration to a composable architecture with +500 API endpoints
    Deployed a multi-site WMS: 7 warehouses, 200 users, 8 international sites
    Conversion optimization: NPS at 75, chatbot retention rate at 90% over 24 days

    Missions:

    Managed major technological migrations (Prestashop → Symfony → Magento)
    Created custom systems (Symfony eCommerce platform, proprietary WMS, excise platform, keg return management)
    Wrote PRDs and specifications in Gherkin to accelerate development
    Facilitated Agile rituals and obtained buy-in from the Executive Committee
    Implemented automated monitoring (Databox, Snowflake, PowerBI, Amplitude, SQL)
    Transformed company tools (Front, Intercom, Notion, Linear)

    Technical environment:
    Agile/Scrum • API-first Architecture • Magento, Symfony • OMS, WMS, PIM • Algolia • Jira, Linear, Notion • Databox, Snowflake, PowerBI, Amplitude, SQL.
    API Symfony Amplitude Linear SQL
  • IKOMOBI
    Product Owner
    DIGITAL AND IT
    November 2015 - March 2017 (1 year and 4 months)
    Lille, France
    End-to-end management of 8 applications (7 native iOS/Android + 1 web app) for major clients in the retail, sports, and healthcare sectors.
    Key achievements:

    Managed high-stakes projects: budgets up to €400K, monthly revenues up to €20M
    Coordinated multidisciplinary teams: developers and product designers
    Clients: Auchan Drive, Decathlon, Ikea, Alptis, Force A, Smart Module Concept, Clinitex

    Missions:

    Created mobile applications from scratch and continuous functional evolution (notably Auchan Drive)
    Designed UX/UI and wrote functional specifications
    Tested and validated APIs (Postman, Runscope)
    Deployed new features and bug fixes
    Monitored performance and analytics (Google Analytics, Crashlytics)

    Technical environment:
    Agile/Scrum Methodology • iOS, Android, Windows Phone, Web • Jira, Sketch, Postman, Google Analytics
    Claude is an AI and may make mistakes. Please verify the answers.
    API

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Education

  • Master 2 Marketing & eCommerce
    IAE Lille
    2014

Skill set (24)

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