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Matthieu CelestineMC

Matthieu Celestine

Supermalter

HTML Email Integrator | Outlook, Gmail, Dark

€450/day
373 projects
Paris, FR
8-15 years

Average response time: 2 hours

Freelancer profile translated to English.
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About Matthieu

I support CRM teams and agencies in integrating and securing their HTML emails.

Specifically, I work on:
• HTML email integration (templates, campaigns, variations)
• Bug fixing (Outlook, Gmail, all email clients, responsive, dark mode)
• Multi-client QA (Email on Acid guarantees display compliance across all email clients)
• Technical optimization (size, code structure, display)

👉 Fast turnaround, reliable, tested, and ready-to-send emails, even in demanding contexts

10+ years of experience — 350+ projects
(Air Liquide, L’Oréal, Retail Renaut Groupe, Galeries Lafayette, BNP Paribas, etc.)

Proficient ESP / CRM
• Salesforce / Pardot (Account Engagement), HubSpot, Klaviyo, Adobe Campaign
• Mailchimp, Brevo, other tools depending on your stack

👉 If you have a critical email to send or a production peak, I can step in quickly.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • AIR LIQUIDE SA
    Email Template Developer - Pardot & Salesforce Marketing Cloud
    CHEMICAL
    July 2023 - Today (2 years and 10 months)
    Paris, France

    Objective

    Design and delivercustom HTML templates and components**, ready for use and aligned with the brand's identity, to enable the marketing team to quickly deploy **high-performing and engagingcampaigns.

    Key Achievements

    -> Development of several modular **HTML email templates**, optimized for compatibility with all platforms and email clients
    -> Advanced integration onPardotand **Salesforce Marketing Cloud**, ensuring a smooth workflow and immediate usability by the marketing team
    -> Full testing withLitmusto ensureperfect displayon Gmail, Outlook, iPhone, Yahoo Mail, and all other email clients, without compromising quality or visual rendering
    -> Technical optimization to maximize campaigndeliverability**, **engagement**, and **performance

    Impact

    The developed templates have becomekey strategic tools**, allowing Air Liquide to launch **faster**, more **effectivecampaigns, and with **full autonomy**.
    Emailing Salesforce Marketing Cloud Pardot HTML Email Template
  • Retail Renault Group
    Email Developer
    AUTOMOBILE
    June 2024 - Today (2 years)
    Paris, France

    Objective

    Develop and delivercustom emailsforstrategic campaignsandmajor group operations(showrooms, private sales, electric vehicle offers, etc.), in order to maximizecustomer engagementand **commercial impact**.

    Key Achievements

    -> Fully customHTML development**, optimized for all email clients, ensuring **perfect rendering on desktop and mobile
    -> Development focused on strategic operations, ensuring precise and effective campaign deployment by the marketing team
    ->Litmustesting to ensure perfect display on Gmail, Outlook, iPhone, Yahoo Mail, and other email clients.
    -> **Turnkey delivery**, ready for sending, in full compliance with Renault Group's branding and standards

    Impact

    The emails created enable Renault Group to **successfully conduct major operations**, generating high engagement and strengthening the brand's visibility and **premium image**.
    Emailing HTML Email Integration Responsive Integration
  • Suez France
    Email Developer
    ENVIRONMENTAL
    May 2024 - December 2024 (7 months)
    Paris, France

    Objective

    Redesign theinternal newsletter template"Weekly Watch" to ensureperfect display on all email clientsand improve the reading experience of the company's weekly news.

    Key Achievements

    -> Complete redesign of the **template's HTML**, optimized for Microsoft Outlook and mobile, ensuring impeccable rendering across all email clients
    -> Optimization ofemail designand template structure, facilitating the reading of content powered by PowerApps while enhancingSuez's visual identity
    -> Full testing withLitmusto ensure perfect compatibility and asmooth user experienceacross all devices

    Impact

    The Weekly Watch newsletter has become areliable and premium internal tool**, improving the dissemination of weekly information and strengthening **visual consistency and readabilityfor all Suez employees.
    Emailing Email Marketing Email Design Emailing Integration Litmus

Reviews

5.0

Out of 234 ratings

C

Caroline

Partner - Hopscotch Groupe -

Reviewed on 5/20/2026

Cela fait plusieurs années que je sollicite Matthieu sur des missions d'intégration, il est toujours réactif et s'adapte à nos délais souvent mouvants. Les livrables sont de qualité et la communication facile.
G

Geraldine

Digital Content Manager - Air Liquide Santé France

Reviewed on 4/15/2026

Matthieu nous a accompagné dans le cadre de la création de templates d'emails et landing pages sur l'outil Pardot. Grâce à sa réactivité, ses compétences techniques et à sa proactivité, nous avons pu créer une véritable librairie d'outils clés en main à destination d'un public de Digital Marketing Manager avec une maturité variée sur l'outil. La communication avec lui est fluide, les délais sont tenus, des solutions sont toujours données et explicitées. Malgré des demandes évolutives serrées, le résultat a toujours été au RDV.

Recommendations

ST
Anne LeAL
FU
+7
Sarah Tomen and 9 other people have recommended Matthieu

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Education

  • E-commerce website design / Web page design, digital / multimedia and information resources
    EfreiTech the Digital Academy
    2013
    Modules de formation : - HTML5, CSS3, jQuery - JavaScript - PHP / MySQL - Adobe Photoshop - CMS Wordpress - SEO
  • Multimedia Project Manager / Web Management / Multimedia and Webmaster
    L'École Multimédia
    2015
    Modules de formation : - HTML5, CSS3 - SEO - E-marketing - Gestion de projets - UX Design - E-reputation

Certifications

  • Mailchimp Foundations
    Mailchimp
    2021
    Email Marketing Mailchimp Emailing CRM
  • Email Marketing Certification
    Mailchimp
    2021
    Email Marketing Mailchimp Emailing CRM

Skill set

Categories