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Guilhem JollyGJ

Guilhem Jolly

Analytics Engineer | Power BI Trainer

€750/day
9 projects
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Guilhem

Do you want to **reduce your risks**, ease the reporting burden on your employees, and make the **right decisions for your business**?

Are you a VSE/SME/Mid-cap company and cannot afford a data team, even though you need one more than ever?

As a Power BI Expert & Trainer, I will help you implement a reliable, accessible, and centralized reporting system.

Choosing to work with me means:

- An audit of your Power BI workflow focusing on your reporting challenges and objectives across 4 pillars:data reliability, construction, interface, and deployment.

- Arobust systemthat allows you to scale your reporting to calmly monitor your business across your various systems (ERP, CRM, Operations, etc.)

- Templated reports for your use cases (financial piloting with cash management, operational logistics piloting, etc.)

-Training for your teamsto support them in adopting Power BI

- Easy deployment of reportswithout technical managementfor you and your users.

Choosing to be mentored by me means:

- Improving your Power BI skills to stop spending time (re)doing the same analyses every month with YOUR data and YOUR specific issues.

- Personalized content with all the technical concepts and replays you need to deliver reliable and robust reporting.

Accustomed to working with VSEs/SMEs, Startups, and Large Corporations, I am very flexible regarding your needs.

Do not hesitate to contact me!
  • French

    Native or bilingual

  • English

    Fluent

  • German

    Fluent

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

Experience

  • DAF-360
    Malt logoOn Malt
    Financial Processing & Consolidation Report
    PRIVATE EQUITY
    April 2026 - April 2026
    My client, an outsourced CFO, had a problem consolidating different general ledger files and inconsistencies in accounting mapping. In this context, we implemented a consolidation under PowerQuery to:

    1. Streamline and document transformations between general ledgers
    2. Consolidate mappings and implement quality controls on the different accounts of the consolidated entities (accounting keys)
    3. Evolve the balance sheet report in Excel to automatically calculate items based on actuals, budget, and the group's relevant entities
    4. Prepare specifications for data integration into Power BI

    This mission allowed for the delivery of a quick and reliable balance sheet.
    Microsoft Power BI PowerQuery Microsoft Excel
  • INSIDER GESTION
    Malt logoOn Malt
    Creation of a 360° Decision Cockpit
    TRAVEL AND TOURISM
    January 2026 - February 2026 (1 month)
    As part of supporting a tourism company with €2M in revenue, the director needed a 360° view of her business performance, integrating commercial, financial, and operational data from her booking site and financial tools.

    Need & Scope

    • Data scattered between the e-commerce back-office and internal tools
    • Time-consuming monthly reporting, done manually
    • Impossible to detect business opportunities or alerts in real-time

    Solution Delivered

    • Direct connection to the e-commerce back-office (SQL database)
    • Real-time holistic reporting: commercial performance, profitability per trip/provider, financial management, customer retention.
    • Deployment without technical management or individual licenses for users via Power BI Embedded
    Results:
    • Proactive detection of cash flow tensions
    • Customer payment delays and retention between commercial touchpoints
    • Identification of margin opportunity levers through various service offerings by destination and local providers.
    SQL Microsoft Power BI Microsoft Azure CFO
  • Laboratoires Pierre Fabre
    Analytics Engineer
    PHARMACEUTICALS INDUSTRY
    May 2025 - Today (1 year and 3 months)
    Paris, France
    Within the Strategic Market Insights department, I design and implement integrated BI reporting solutions.

    I have notably worked on:

    - A group report aimed at identifying parallel import flows of medicines and reallocating financial performance between countries (+ €5M)

    - Product launch reports (market share, distribution, revenue)

    - Migration of external data onto a Snowflake Data Platform to industrialize and secure ingestion and transformation.

    I also support technical and business teams in adopting Power BI with advanced training.
    Microsoft Power BI Snowflake Python DBT Airflow

Reviews

5.0

Out of 2 ratings

J

Jenny

Dirigeante - DAF-360

Reviewed on 4/13/2026

In a context of reporting optimization, Guilhem was very responsive to the request and completed his part within the promised timeframe, which allowed me to be very effective in my mission. I recommend him.
MélanieM

Mélanie

DAF externalisée - INSIDER GESTION

Reviewed on 3/20/2026

In addition to being incredibly effective, Guilhem is pleasant and always cooperative in moving projects forward. I particularly appreciate his client satisfaction-oriented approach, which is strongly felt during the delivery of our joint project.

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Education

  • Grande Ecole Program, Business Administration, General
    NEOMA Business School
    2022
    Programme Grande Ecole , Administration et gestion des affaires, général
  • Master in IT Data & Digital Communication, Business Administration, General
    MCI | The Entrepreneurial School®
    2022
    Master It Data & Digital Communication, Administration et gestion des affaires, général

Skill set

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