You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Malt Strategy
New report
Malt Tech Trends 2026
Grégoire Séguin-HenryGS

Grégoire Séguin-Henry

Supermalter

Senior Data Engineer - Spark - DevOps - Architect

€650/day
2 projects
Lyon, FR
8-15 years
Apache Spark
Cloud AWS
Agility
Backend Service Development
Big Data

Average response time: 1 hour

Freelancer profile translated to English.
Back to original language

About Grégoire

Perfectionist and rigorous, I have developed over 10 years a recognized expertise in data engineering, by optimizing code and solving complex challenges. Whether as a technical expert or team leader, I am motivated by the transmission of skills and the success of data projects. My results-oriented and collaborative approach allows me to guide teams towards excellence, by creating robust, scalable data solutions aligned with business objectives.
E-commerce
Energy and Electricity

  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Lyon (up to 50km), Chambéry (up to 50km), Paris (up to 50km), Pau (up to 50km), Grenoble (up to 50km)

Experience

  • ENGIE - Entreprises & Collectivités - Lyon
    Malt logoOn Malt
    AWS Orchestration & Databricks Ingestion Pipeline
    ENERGY AND UTILITIES
    June 2025 - December 2025 (5 months)
    Lyon, France
    Databricks/AWS Data Engineer. Delivery of features and implementation of modular Python code used by notebooks to benefit from the IDE (auto-completion, tests). Adoption of standards (reviews, lint/CI, docs) and continuous improvement. Gains: quality, velocity, onboarding.
    Python Terraform AWS Databricks Github Actions
  • Engie Entreprise & Collectivité
    Maintenance and Evolution of the B2Bill Project
    ENERGY AND UTILITIES
    May 2025 - Today (1 year and 1 month)
    Lyon, France
    As part of Engie's digital transformation, I am working as a Data Engineer on the B2BILL project, a B2B billing platform for the energy market in France. My mission is to maintain and evolve a complex data architecture deployed on AWS and Databricks.

    Technical Scope:

    Infrastructure as Code:Management of multi-environment Terraform stacks (dev, staging, pre-prod, prod) including AWS lambdas, Step Functions, EventBridge, API Gateway, DynamoDB, and S3

    Data Processing:Development and maintenance of PySpark jobs on Databricks for processing billing data

    Event-Driven Architecture:Use of bus with eventbridge for inter-project communication

    Exposure APIs:Development of Python lambdas to expose data via secure REST APIs

    Main Activities:

    Ensure corrective and evolutionary maintenance of the entire platform
    Optimize existing data pipelines and develop new features.
    Refactor code to improve reusability and maintainability.
    Manage deployments via CI/CD (GitHub Actions) and resolve production incidents
    Contribute to the standardization of data development practices within the team

    Technologies Used:Python, PySpark, Databricks, Terraform, AWS (Lambda, S3, DynamoDB, EventBridge, Step Functions, SQS, api gateway), Git,Copilot

    This mission requires deep technical expertise in data engineering and the ability to work across the entire data stack, from ingestion to data exposure.
    Terraform Python 3 Databricks AWS DynamoDB
  • Groupe Seb,
    Data Engineer
    January 2022 - August 2024 (2 years and 8 months)
    Écully, France
    Groupe Seb is an appliance retailer. I worked in the 'data consumer solution' domain team, which aims to provide and analyze consumer data. Helping sales teams understand the impact of their campaigns, identify missed opportunities, measure the effectiveness of applications and websites, or the success of products.

    Six Data Engineers in the domain, about twenty in total (a weekly meeting for inter-domain data engineers). The domain comprises about thirty people, including data stewards, data scientists, product owners, Google Analytics experts, etc.

    The organization was collaborative, and the managers were attentive, which allowed me to participate in cross-functional projects. I also initiated cross-functional projects (responding to a need).

    Missions:
    • Taking over existing projects, enriching them, and migrating them to an enterprise framework.
    • Modularizing code and project components. Adding unit tests.
    • Presenting certain technical sessions and contributing to common company code and the data mesh architecture being implemented.
    • Improving the performance of certain Spark jobs, sometimes dramatically.
    • Assisting with project architecture and/or debugging.
    • Improving Jenkins workflows. Improving certain Ansible roles programmed to generate files in S3 from REST APIs.

    Technical Environment:

    Methodologies:Scrum with Kanban on Jira. My tools: git, Jira, Teams, IntelliJ, draw.io, Postman
    AWS Tools:Step Functions, Glue, S3, Lambda, CloudWatch, CloudFormation, Fargate, IAM roles and policies, AWS terminal, ECS
    Technical Stack:Spark, Scala, Java, Python, Ansible, Jenkins, Jira, Docker, Java multi-threading
Check out Grégoire's experience

Reviews

5.0

Out of 1 rating

L

Lina

Orchestration AWS & Pipeline d'ingestion Databricks - ENGIE - Entreprises & Collectivités - Lyon

Less than 1 year project

-

Reviewed on 1/12/2026

Grégoire was a real asset to the project. He was able to integrate into a functionally complex project and deliver value very quickly. He is very competent and his developments are of very high quality. He also made proactive suggestions for implementing improvements.

Recommendations

Be the first to recommend Grégoire

Help this freelancer shine by sharing your experience working together.

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Signup to reveal

Education

  • Generalist Engineer Degree
    IMTAtlantique,
    2015
    Diplôme d'ingénieur généraliste

Certifications

Skill set

External API integration
Performance Optimization
Testing and Quality Assurance
CI/CD Management
Infra as Code
Microservices Architecture
ETL (Extract, Transform, Load) Processes
Apache Nifi
Scala
Python Programming
Docker
Jenkins
Jira
Apache Kafka
Hive
HBase
Angular 7
Database
Vert.x
Python 3
Kubernetes
Ansible
Nginx
Terraform
Spring boot
Java
Git
Opensearch

Categories