Freelancer profile translated to English.
Back to original languageAbout Gaston
Senior BI Consultant specializing in the design, optimization, and validation of end-to-end decision-support solutions. I work on the entire data product lifecycle: ingestion, transformation, modeling, industrialization, governance, and business support.
My goal: to ensure stable, high-performing, and usable BI environments, while ensuring controlled delivery and empowering teams.
Key deliverables and expertise
• Corrective and evolutionary maintenance of existing BI solutions, with a focus on stability, reliability, and performance.
• Identification, analysis, and resolution of incidents (models, refreshes, sources, governance).
• Development of data feeding, transformation, and enhancement pipelines (Power Query, SQL, pipelines).
- Design and implementation of high-performance, business-oriented dashboards (Power BI, DAX, storytelling).
• Supervision of testing phases: unit, integration, acceptance, business validation.
• Securing production deployments, access management (Azure AD / RLS), and operational launch support.
• Definition, monitoring, and optimization of post-go-live performance indicators.
• Production of functional and technical documentation, skills transfer, and team support.
French
Native or bilingual
English
Conversational
Can work on-site
Paris (up to 50km), Nantes (up to 100km), Paris (up to 100km), Le Mans (up to 50km)
Experience
- RATPData AnalystTRANSPORTATIONJuly 2025 - Today (1 year and 1 month)Paris, FranceDesign and deployment of decision-support solutions for operational and strategic management, within the CESCO Team and in support of the COMEX.
- Gathering and analysis of business needs to consolidate key indicators for operational, strategic, and project portfolio management.
- Development and optimization of Power BI reports (DAX, Power Query) with an analytical UX adapted to operational departments and COMEX decision-makers.
- Integration, transformation, and modeling of large-scale data using Databricks (Delta Lake, notebooks, pipelines).
- Reconciliation of Jira data (progress, workload, capacity) with infraction data.
- Implementation and monitoring of KPIs for the operations, maintenance, and infrastructure departments (performance, incidents).
- Contribution to the COMEX consolidated vision: workload projection, actual vs. consumed variance analysis, project portfolio management.
- Report publication, access management (Azure AD / RLS), and governance in Power BI Service.
- Agile project management: ticket estimation, user stories, sprints, backlog, deliverable tracking via Jira, functional and technical documentation in Confluence.
- Total energiesPower BI ConsultantENERGY AND UTILITIESMay 2024 - June 2025 (1 year and 1 month)Paris, FranceData Quality, Power BI modeling, interactive reports, governance, and business support.
- Analysis of data quality, consistency, and reliability (business rules, checks, normalization).
- Design and modeling of datasets with Power Query (M), DAX, and Power BI semantic model.
Development of interactive Power BI reports: analytical UX, business storytelling, operational & financial KPIs.- Utilization of Jira to structure operational data (tickets, workflows, workload, progress).
- Functional documentation and business rules in Confluence (glossary, data dictionary, process).
- Publication, administration, and access rights management (RLS, workspaces, governance).
- Performance optimization (star schema, relationships, incremental refresh).
- Facilitation of functional workshops to frame needs, define indicators, and align business rules.
- Training and support for business teams to enhance analytical autonomy.
- ENGIEPower BI ConsultantENERGY AND UTILITIESJanuary 2024 - April 2024 (3 months)Paris, FranceSupporting financial and operational teams in consolidating, transforming, and leveraging multi-entity data, with a focus on order management, sales, inventory, and procurement analysis.**Objective**: Deliver reliable, high-performing, and decision-oriented Power BI reports.
- Audit and optimization of existing reports (quality, UX, performance, DAX, models).
- Redesign of data models (star schema, facts/dimensions) and creation of robust DAX measures.
- Development of new financial and operational dashboards (orders, sales, inventory).
- Industrialization of data feeding pipelines and implementation of advanced KPIs.
- Performance optimization, Power BI governance, security, and incident resolution.
- Testing, deployment, post-go-live support, and continuous improvement.
- Documentation and skills transfer to internal teams.
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Education
- Master of Mathematics and Computer Science, specialization in Statistical EngineeringUSTHB2013
- Master of Applied Mathematics, specialization in Data ScienceUniversité Rennes2020Master Mathématique Appliquée, spécialité Sciences Des Données