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Sébastien LetellierSL

Sébastien Letellier

Digital transformation - DATA & AI projects

€667/day
3 projects
Lyon, FR
8-15 years
Digital Transformation
Team Management
IT Strategy
Transition Manager
Data

Average response time: 1 hour

Freelancer profile translated to English.
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About Sébastien

I am a project manager with 10 years of experience, from setting up Data Lakes to operational governance, including managing multidisciplinary teams. What sets me apart: I bridge the gap between business needs and technical teams, with a tool-based approach (Data Mesh, GDPR, ISO 27001) and ongoing Executive training at EM Lyon to go even further in digital transformation and AI.
Rail and Public transport
Banking and Financial Services
Electrical industry
Public Sector

  • French

    Native or bilingual

  • English

    Conversational

Can work on-site
Lyon (up to 50km), Paris (up to 10km)

Experience

  • RATPDev LYON
    Data Manager (Interim)
    TRANSPORTATION
    May 2025 - April 2026 (11 months)
    Lyon, France
    Data Program & Delivery Management:
    Framing and management of the Data application deployment program
    Definition, management, and responsibility of the Data roadmap
    Prioritization of initiatives and guarantee of use case implementation
    Collection, qualification, and arbitration of business needs within the Data platform
    Coordination with technical teams for data flow deployment
    Management of data explorations and Proof of Concepts (POC)
    Supervision of use case and analytical technology testing
    Management of the Data Lake implementation project
    Flash audit of Elevators and Escalators;

    Data Management & Governance:
    Implementation of the company's Data Management strategy
    Animation of operational data governance
    Structuring the strategy for collecting internal data (maintenance, operations, passengers) and external data (partners, territories, open data, marketplace…)
    Implementation of a Data Governance tool
    Democratization, popularization, and promotion of Data culture
    Animation of business workshops to identify and prioritize use cases
    Structuring, mapping, and standardizing data to optimize the operational performance of transport networks
    Ensuring data quality, reliability, and consistency
    Control of regulatory compliance for data usage (GDPR)
    Deployment and management of the Data democratization program (local and group level)
    Contribution to the development and animation of the Data community

    Tools: JIRA, Confluence, DATA GALAXY, AWS, DBT Core, Airflow, Snowflake, QlikCloud, Semarchy xDI, SharePoint, Agile (Scrum), MIRO
    Data Galaxy AWS Cloud Project Management Transition Management IT Strategy
  • ITNOVEM
    Data Project Manager
    TRANSPORTATION
    April 2023 - April 2025 (2 years)
    Lyon, France
    Program & Project Management:
    Management of a multi-project portfolio (Security & Energy)
    Coordination of scopes in program mode
    Implementation of a Data Mesh approach for project architectures
    Addressing challenges of streamlining interactions between teams and applications
    Collection, analysis, and framing of business and/or IT needs
    Challenging proposed technical solutions and building solutions
    Prioritization, estimation, and delivery focused on quick wins
    Proactive risk management and anticipation of points of tension

    Architecture & Technical Expertise:
    Development and arbitration of technical choices throughout the project lifecycle
    Continuous technological watch based on business use cases
    Co-construction of technical responses with IT teams
    Contribution to the writing of technical specifications
    Participation in the development of the Cyber Security Assurance Plan
    Contribution to architecture documents (DAL & DAT)

    Delivery & Agility:
    Responsibility for the backlog and User Stories
    Contribution to functional specifications
    Animation of steering and monitoring meetings (COPROJ, COPIL, reports)
    Animation of Agile ceremonies: release backlog, sprint planning, refinement
    Coordination of contributing teams: Architects, CloudOps, Flows, Data Engineers, Data Scientists…
    Project organization: planning, backlog, budget
    Implementation and management of task forces during critical phases
    Contribution to commercial proposals and client relationship management
    Animation of projects in Agile mode

    Operations & Run:
    Supervision and monitoring of Rundeck jobs (ingestion of NiFi & Databricks flows)
    Management and prioritization of N3 incidents in production
    Big Data environment: data quality and governance, algorithms, visualization

    Tools: JIRA, Confluence, Databricks, Rundeck, Power BI, Nifi, Azure, Azure Storage Explorer, CyberArk (PAM), Hydra, SharePoint, Timeperf, Agile (Scrum), Python, PostgreSQL, Terraform
    Azure Cloud Azure Data Factory Big Data Project Management Office Cloud Computing
  • Saint-Gobain
    Business Intelligence Project Manager QlikView / Qlik Sense
    RAW MATERIALS INDUSTRY
    May 2022 - April 2023 (1 year)
    Project:
    Project management: coordination, facilitation, and schedule monitoring;
    Reference for a supply chain scope (Stock & Transport) for QlikView / Qlik Sense applications;
    Collection of business needs – AMOA / Key User contact point;
    Writing of technical specifications;
    User acceptance testing, homologation of developments;
    Synchronization point with the Indian team for development monitoring.

    Technical:
    Qlik development of new dashboards, co-construction with end-users;
    Deployment / Monitoring of post-production activity;
    Evolutionary maintenance of applications, and MCO management;
    Processing of ServiceNow incident tickets.
    JIRA Qlik Sense QlikView Microsoft Power BI Agile Methodology
Check out Sébastien's experience

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Education

  • Master in Business Engineering for Complex Solutions and Technologies
    PPA Business School
    2016
  • Master Expert in Computer Engineering and Information Systems
    ESGI
    2016

Certifications

  • Data for Managers
    HEC Paris Executive Education
    2022

Skill set

Project Management
Project Management
Product Strategy
Innovation Management
Project Management (PMO)
IT Project Management
Change and Transformation Management
Digital Transformation
Delivery Management
IT Strategy
IT Strategy
IT Architecture
Compliance

Categories