Freelancer profile translated to English.
Back to original languageAbout Bello
Looking to transform your raw data into a decision-making lever? As a Data Engineer with 3 years of operational experience, I will guide you through the entire data lifecycle: from raw ingestion to business exploitation.
I design and industrialize robust ETL/ELT pipelines, optimize your relational and NoSQL databases, and prepare your transition to the cloud (GCP, BigQuery). My approach combines technical expertise with business vision: I don't just deliver code, I ensure your data is reliable, accessible, and directly actionable by your teams.
What sets me apart? Mastery of the complete data cycle (ingestion, storage, transformation, orchestration, quality, and governance) with a proven stack (Python, SQL, Talend, Power BI). I deliver industrialized, documented, and maintainable solutions designed for production from day one.
Types of projects and deliverables completed: migration and structuring of legacy data, implementation of analytics platforms, creation of decision-making dashboards, automation of reporting, cleaning and qualification of large-scale data, optimization and redesign of existing pipelines. I am available for full remote work or on-site depending on your needs.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km)
Experience
- AtolCDData Engineer Fixed-Term ContractTECHJanuary 2025 - June 2025 (5 months)
- Development and deployment of a batch data ingestion pipeline for meteorological data via the data.gouv.fr API
- Cleaning, structuring, and storing data in SQL and NoSQL databases; optimization of data schemas
- Creation of dashboards for monitoring key performance indicators and reporting KPIs to stakeholders
- Business data analysis and presentation in the form of interactive visualizations for decision-making guidance
- Maison de science de l'homme DijonData Engineer / Analyst - Fixed-Term ContractSeptember 2025 - Today (11 months)
- Design and industrialization of ETL pipelines (ingestion, transformation, validation, monitoring) with data quality management and workflow automation.
- Automation of recurring processing workflows, significantly reducing manual interventions.
- Automation of pipelines and improvement of workflow robustness (DataOps logic)
- Application of data protection best practices (GDPR): pseudonymization, access control, processing traceability.
- Creation of interactive visualizations for presenting results to research teams.
- Writing technical documentation and regular progress reports. Preparation for integrating pipelines into cloud environments (GCP BigQuery, orchestration)
- Upwork - FreelanceData Project—Database Management and ExploitationJanuary 2020 - January 2021 (1 year)
- Design and development of a complete ETL pipeline using Python and SQL for multi-source data integration (CSV files, web APIs, forms)
- Orchestration and automation of processing workflows via Apache Airflow; setup of scheduled DAGs and monitoring of executions
- Data transformation, cleaning, normalization, and aggregation; management of data quality and complete traceability of workflows
- Optimization of SQL query performance on MySQL database (indexing, entity-relationship schema, normalization)
- Implementation of reporting through automated exports and structured reports delivered to the end client
- Management of access, user rights, and complete technical documentation of ETL processes
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Education
- Master 2 - Database Artificial IntelligenceUniversity Bourgogne Franche Comté Dijon2025
- Computer Science Bachelor's DegreeUniversity Bourgogne Franche Comté Dijon2022