You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
William CoeurWC

William Coeur

Influence Marketing for E-commerce ROI & ROAS

€350/day
4 projects
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
Back to original language

About William

Creator campaigns that generate measurable sales, not just visibility.

Transforming influencer marketing into a true acquisition channel: selecting conversion-oriented creators, setting up tracking, testing, optimizing, and scaling profitable profiles.

€2M+ budgets managed • 2000+ creators activated • up to €840K generated in 12 months • average ROI 1.9 • up to €40K generated by a single creator.

Ideal for e-commerce brands / DNVBs that already have a marketing budget and want to reduce their reliance on ads.

Frequent situations:
• influence campaigns that generate few sales
• creators poorly aligned with the target audience
• ROI difficult to measure or prove
• rising paid ads CAC
• need to launch TikTok Shop, UGC or affiliate
• desire to structure an "always-on" influence channel

Expected results:
• truly profitable creators identified
• attributed and measurable sales
• clear and reproducible process
• optimization of the influence budget
• acquisition channel complementary to ads

Possible support:
• audit & influence action plan
• acquisition-oriented strategy & annual calendar
• data-driven creator sourcing (nano → macro)
• outreach, negotiation & contracting
• complete tracking (UTM, promo codes, GA4)
• management, reporting & continuous optimization
• scaling of profitable profiles & creator affiliation

Method: audit → tracking → tests → analysis → scaling.

Available for one-off assignments or monthly retainers.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Trend'Up
    Performance Influence Marketing Consultant – E-commerce
    CONSULTING AND AUDITS
    March 2021 - Today (5 years and 3 months)
    Paris, France
    Agency specializing in ROI-driven influencer marketing for e-commerce brands, DNVBs, and startups.

    Core Expertise

    Structuring and managing the influence channel as a profitable acquisition lever: performance influence, ROAS optimization, advanced tracking, creator scaling.

    Problems Addressed:

    - Difficulty identifying truly profitable creators
    - Campaigns without measurable ROI
    - Poorly optimized influence budget
    - Lack of performance tracking (ROAS, CPA, CAC)
    - Dependence on brand awareness without conversion
    - Absence of acquisition strategy via creators
    - Unstructured or unscalable influence channel

    Methodology:

    Audit of the existing channel → identification of profiles with business potential → structuring of tracking (UTM, promo codes, analytics) → testing & validation phase → scaling of high-performing creators.

    Data-driven approach: decisions based on ROAS, CPA, LTV, conversion rates, and individual creator performance.

    Assignments:

    - Definition of conversion-oriented influence strategies
    - Client acquisition via Instagram, TikTok, YouTube
    - Sourcing nano to macro creators
    - Negotiation of creator partnerships
    - Structuring affiliation & tracking
    - Campaign management & KPI reporting
    - Influence budget optimization & scaling

    Client Case

    DNVB brand heavily dependent on paid ads with rising CAC.

    Implementation of a performance-oriented influence strategy + advanced tracking.

    Results:
    - Influence channel structured as an acquisition lever
    - Creators scaled over 6 months
    - Up to €840K generated in one year
    - Reduced dependence on paid ads

    Cumulative Results

    - 2,000+ influencers activated
    - €2M+ in managed budgets
    - Average ROI: 1.9
    - Up to €40K generated by a single creator

    Differentiation:

    I don't just "manage" campaigns.
    I transform influence into a scalable and measurable acquisition channel.
    Influence Marketing influencer relations Influence Campaign Campaign Management Influencer Relations
  • Buddy
    Growth & Acquisition Consultant E-commerce
    CONSULTING AND AUDITS
    May 2023 - May 2024 (1 year and 1 month)
    Paris, France
    Supporting startups and SMEs in e-commerce to structure the influence channel as a profitable acquisition lever.

    Core Expertise:

    Transforming the influence channel into a measurable acquisition engine: selection of conversion-oriented creators, ROAS optimization, performance tracking, and scaling.

    Problems Addressed:

    - Excessive dependence on paid ads
    - Rising acquisition costs
    - Influence used solely for brand awareness
    - Lack of tracking (UTM, promo codes, attribution)
    - Unoptimized creator budget
    - Lack of profitability in social campaigns
    - Unstructured influence channel

    Methodology:

    Audit of existing campaigns → identification of creators with business potential → implementation of tracking → testing phase on micro & mid-tier → ROAS & CPA analysis → scaling of profitable profiles.

    Performance-oriented approach: decisions based on ROAS, cost of acquisition, conversion rate, and overall profitability.

    Assignments:

    - Definition of conversion-oriented influence strategy
    - Sourcing of high-performing creators
    - Partnership negotiation
    - Structuring affiliation & tracking
    - Management of Instagram & TikTok campaigns
    - KPI reporting (ROAS, CPA, sales generated)
    - Continuous optimization & scaling

    Client Case:

    E-commerce startup dependent on paid ads with increasing CAC.
    Restructuring of the influence channel with a performance approach + advanced tracking.

    Results:
    - Average ROI of 400% on activated campaigns
    - 500+ qualified leads generated in 6 months
    - Doubled organic traffic through creator amplification
    - Reduction in overall acquisition cost

    Differentiation:

    Hybrid approach:
    Influence as a creative lever and a measurable acquisition channel.
    ROAS Instagram Marketing Influence Campaign ROI Optimization E-commerce Strategy
  • Arké Management
    Content Marketing & Conversion Consultant
    CONSULTING AND AUDITS
    February 2023 - February 2023
    Paris, France
    Assisting a brand in optimizing its digital content to maximize the conversion of influence campaigns.

    Core Expertise:

    Aligning content (landing pages, product pages, emails) with creator campaigns to increase conversion rates and the profitability of the influence channel.

    Problems Addressed:

    - Traffic generated by influencers converting poorly
    - Landing pages not adapted to creator campaigns
    - SEO content not business-oriented
    - Email marketing disconnected from influence activations
    - Non-optimized conversion funnel

    Methodology:

    Audit of the post-click influence journey → optimization of strategic pages → adaptation of messages to creator audiences → structuring of email sequences → continuous improvement of conversion rates.

    Performance-centered approach: analysis of conversion rates, average order value, and impact on revenue.

    Assignments:

    - Optimization of landing pages related to influence campaigns
    - Writing SEO content focused on acquisition
    - Improvement of sales pages
    - Structuring email marketing post-creator activation
    - Optimization of conversion funnels

    Results Achieved:

    - +25% organic traffic
    - Average email open rate: 35%
    - Average click-through rate: 10%
    - +15% increase in sales in 3 months
    - Significant improvement in post-influence conversion rate

    Differentiation:

    Understanding the complete journey:
    From creator activation → to final conversion.
    Content Marketing Conversion Communication Strategy Web Marketing Strategy SEO Web Copywriting

Reviews

4.7

Out of 3 ratings

A

Alice

Lapeyre - wallet

Reviewed on 5/17/2023

Very good experience, quality work and very responsive!
RebeccaR

Rebecca

Arké Management

Reviewed on 2/4/2023

Thank you very much for your professionalism William! William helped me with content marketing and copywriting for my website. I am very happy with the quality of the work, which was rich in keywords for my site's SEO. I recommend 100%.

Recommendations

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Education

  • Master in Communication & Marketing
    PPA Business School
    2022
    - Stratégie marketing & positionnement de marque - Acquisition digitale & analyse de performance - Structuration de funnels de conversion - Marketing de contenu orienté ROI - Email marketing & automation - SEO & optimisation trafic - Analyse KPI & pilotage rentabilité Mémoire orienté stratégie d’acquisition digitale et rentabilité marketing.

Certifications

  • Content Strategy Certificate
    Coursera
    2020
    ROI-Oriented Content Marketing Content & Acquisition Funnel Alignment influencer relations ROI Optimization Influence Campaign Influence Marketing Strategic Storytelling for Digital Brands Content Performance Analysis (CTR, Conversion) Structuring High-Converting Messages Marketing Message Optimization

Skill set

Categories