Freelancer profile translated to English.
Back to original languageAbout Alex
Senior BI and Data Analyst Consultant, I help companies transform their data into actionable elements and make their decision-making fast and robust.
My specialty: diagnosis and performance optimization of dashboards and the BI chain.
My added value comes from a dual skill: business expertise and data mastery, as well as a structured diagnostic approach.
I identify the root cause across the entire chain, I manage the investigation with the relevant teams, and I align the right expertise to remove blocking points.
Some achievements:
- BNP Paribas: diagnosis of an undersized Oracle server which led to doubling its RAM and restoring a critical, unusable dashboard.
- Bouygues Telecom: redesign of an SQL model (Teradata) reducing execution time from ~2h to a few seconds.
- GIP e-Santé Centre Val de Loire: database quality audit and design of business rules.
- Design of prediction methods for the 4G/5G mobile network (Dataiku, Python).
My interventions: audit and optimization of dashboards (Tableau, Power BI), design of decision-making dashboards (dataviz), optimization and reliability of SQL queries and models, implementation of data quality controls, and integration of generative AI to accelerate analytical production.
Technical environment: SQL (Teradata, Oracle, SQL Server, MySQL, Impala, Hive), Power BI (certified), Tableau Desktop & Server, Power Query / DAX, Python, Dataiku
French
Native or bilingual
English
Fluent
Can work on-site
Le Plessis-Robinson (up to 50km), Paris (up to 50km)
Experience
- BNP ParibasData AnalystBANKING AND INSURANCEApril 2025 - Today (1 year and 4 months)Paris, France•Handling requestsin the form of tickets: enhancements to existing dashboards, incident resolution, design of new dashboards (Tableau).• **Managing dashboard performance optimization**: transverse investigation across the Tableau Server / Oracle / databases chain, leading meetings, highlighting undocumented blocking points.• **Diagnosis of a major infrastructure bottleneck**: highlighting that the Oracle server processing SQL queries for Tableau Server was undersized.• **Technical facilitator role**: asking the right questions, guiding analyses, and aligning experts to resolve complex performance issues.
- Bouygues TelecomBilling Data AnalystTELECOMMUNICATIONSFebruary 2023 - March 2025 (2 years)Meudon, FranceI joined a billing control team for fiber connection services for clients:- Responsibility for enhancements to automatic controls (in SQL)- Redesign of the SQL model for tables and views to improve the performance of the billing control system:-- Execution time gain: tens of seconds vs. 2h-- Implementation of historization- Expertise support for Build: continuous improvement of the billing control process.
- GIP e-Santé Centre Val de LoireData Analyst ExpertPUBLIC SECTORNovember 2022 - February 2023 (3 months)Olivet, FranceExpertise for resolving anomalies on repositories- Client interviews regarding the context- Familiarization with the technical environment (e-health tools)- Data collection and cleaning (Power Query and M Language)- Overall assessment of the problem- Reverse engineering and identification of unknown business rules.SQL Database familiarization- Client support on manipulation (MySQL)- Visual restitution of the Physical Data Model- Creation of SQL procedures to facilitate client use.Tools: e-health tools, Power Query, M Language, MySQL
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Education
- Engineering degree, TelecommunicationsEPF Engineering School2012Diplôme d'ingénieur, Télécommunications
- Semester of study, Networks and TelecommunicationsUniversity of Montreal - Polytechnique Montreal School2012Semestre d'études, Réseaux et Télécommunications