Freelancer profile translated to English.
Back to original languageAbout Guillaume
I enjoy supporting companies on their business transformation programs, both at the business level and on technical issues.
I am pragmatic and have solid experience in IT reorganizations in complex contexts.
Geographically mobile, I am open to any transition management proposals.
French
Native or bilingual
Can work on-site
Paris (up to 50km), Lyon (up to 50km), Clermont-Ferrand (up to 50km), Montpellier (up to 50km), Nantes (up to 50km)
Experience
- société RATPData Quality AuditSeptember 2025 - Today (9 months)• • Audit of the current situation on 4 themes significant to the company's overall business• • Evaluation of key data quality indicators and remediation paths to better manage Data Quality. Creation of dashboards for data governance. How to use AI to improve data quality• • Tools: Databricks, Collate, Colibra, Python, various AI models
- société Emeria TechnologiesFreelance Migration and Data Science ConsultantOctober 2023 - September 2025 (1 year and 11 months)• • Data Migration: as part of strong external growth, participation in improving the migration process of acquired firms into the internal Foncia Millenium software. Simplification of processes and technical overhaul of the migration tool (transition from a Talend solution to a solution better integrated with Millenium).• • Preparation for electronic invoicing in 2026 for exchanges with Foncia suppliers (regulatory obligation from September 2026 for EDI invoicing via a PDP).• • Data Quality: improvement of data quality to optimize business processes and quality of service.• • Use of AI to control and validate data.• • Tools: Snowflake, Streamlit, Observablehq, Python with AI assistance
- société Banque Postale IARDProject DirectorJuly 2021 - September 2023 (2 years and 2 months)• • Project management on the publisher side Cleva• • Management of data migration from older Cleva versions to recent versions
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Education
- Computer EngineeringUTC Compiègne1995
- Advanced MathematicsLycéee Louis-le-Grand1992