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

Harold J.

Consultant CRO I UX Design | Data | AB Testing

€750/day
Paris, FR
15+ years

Average response time: 1 hour

Freelancer profile translated to English.
Back to original language

About Harold

CRO Consultant and UX expert, I have been helping companies for over 15 years to improve their digital experiences and conversion rates.

I combine data analysis and user-centered design to maximize conversion and reduce friction on your websites and mobile applications.

Typical missions:
  • UX and data audits
  • Tracking (implementation, monitoring)
  • Digital journey design (redesign, optimization)
  • A/B tests to improve conversion and user satisfaction
  • Dashboard (results monitoring)
  • Support for roadmap deployment (prioritization, monitoring)
Sector examples:
  • Media: ELLE (CMI), Bauer Media, Radio France, Actu.fr
  • Mutual insurance / Insurance / Banking: MNH, Crédit Agricole
  • Mobility: Île-de-France Mobilités, Keolis
  • Energy: EDF ENR, Mint Énergie
  • Services: Seloger, Sodexo
  • Retail: Cultura
Value delivered:
  • Improvement of conversion rate & digital revenue
  • Reduction of lead time
  • Optimization of acquisition costs
  • Reduction of friction in digital journeys
  • Skill development of internal teams
Why choose me?
  • Operational and strategic expertise, with measurable results
  • Data-driven and user-centered methodology
  • Ability to support from A to Z (audit, design, testing, analysis)
  • Agile and transparent collaboration with your internal teams
Want to improve your digital journeys and increase your conversions?
Let's discuss your project and see how I can help you.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 50km)

Experience

  • UNAMI
    Associate Director / CRO, Data & Design Expert
    CONSULTING AND AUDITS
    January 2010 - Today (16 years and 5 months)
    For several years, I have been helping major clients improve their digital journeys by combining Design & Data.
  • CMI France
    CRO Consultant (Conversion Optimization)
    PRESS AND MEDIA
    September 2019 - Today (6 years and 9 months)
    Levallois-Perret, France
    🎯The mission

    Support the digital teams of CMI France (marketing, subscription, and product) in the continuous conversion optimization of media (Elle.fr) and e-commerce (jemabonne.fr) sites.

    Objective: develop press subscription sales via the digital channel.

    🧠Expertise deployed
    • Data analysis: Piano Analytics, GA4, Contentsquare, dashboard in Looker Studio.
    • Design: consulting & UX optimization proposals, Figma prototyping
    • Roadmap management (prioritization and deployment support).
    • Experimentation program management (AB Testing with Kameleoon).
    • Experimentation with AI components of the tools.
    • Financial reporting with ROI.
    🧠Collaboration

    Close teamwork with marketing, subscription, and product teams to improve performance.
    • Weekly: test review and prioritization.
    • Monthly: analytics monitoring and discussions.
    • Quarterly: prioritization of a work stream (audit/recommendation/ab tests)
    • Semi-annually: overall review and ROI.

    📈Results:
    • +25% user engagement
    • +30% conversion, thanks to successful AB tests
    • Over 5 years of collaboration with the group
  • CULTURA
    Data & UX Audit
    E-COMMERCE
    April 2022 - January 2023 (9 months)
    🎯 A two-part mission
    • Audit of the Cultura.com website's purchase funnel to improve its conversion.
    • Support for the teams in deploying the optimization roadmap.

    🧠 Expertise deployed

    • Identification of friction points through a comprehensive audit: Data / Performance / UX.
    • Proposal of concrete optimizations.
    • Prioritization of optimizations and roadmap construction.
    • Support for roadmap deployment.
    • In-depth analyses (Contentsquare, Kameleoon, Adobe Analytics).

    🧠 Collaboration

    Support that has enabled the teams to be trained and coached in improving their skills in CRO tools and methodology.

    📈 Results:
    • +80 optimizations proposed
    • +20 in-depth analyses carried out
    • +30% conversion observed in the funnel

Recommendations

Be the first to recommend Harold

Help this freelancer shine by sharing your experience working together.

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

Skill set

Categories