Ahmed Tchagnaou

Experience

A Data Engineer at CGI since 2022, I work on major-account projects: large batch pipelines, Talend to Spark/Scala migrations, data lake optimization and operations. Alongside, I build generative AI projects (RAG, LLM agents).

Education: Master’s in Big Data Management and Analytics, University of Tours (2020 – 2022) · Bachelor’s in Computer Science, University of Tours (2019 – 2020) · Professional Bachelor’s in Software Engineering, African Institute of Computer Science (IAI), Togo (2016 – 2019).

CGI — Société Générale

Data Engineer

Oct 2025 - Present
Paris

Responsibilities:

  • Hardened and maintained enterprise batch data pipelines (2–3 TB) under strict availability constraints
  • Migrated Talend jobs to Spark/Scala and optimized Spark/SQL jobs, with runtime gains of up to 1 h → 2 min
  • Autonomous on several applications: production support, incident analysis, scheduling, data lake service continuity
  • Deployed CI/CD pipelines and automated operations (GitHub Actions, Ansible, AWX)
Spark Scala SQL Talend GitHub Actions Ansible / AWX JFrog
CGI — Covéa

Data Engineer · technical lead

Jan 2022 - Sep 2025
Tours

Responsibilities:

  • Built and maintained, with Talend for Big Data, hundreds of ingestion, transformation and enrichment flows in a data lake feeding fuzzy search algorithms
  • Optimizations bringing some jobs down from 4 h to 20 min and from 2 h to 1 h 20
  • Contributed to the Talend 7 → 8 and CDH → CDP migrations (automated non-regression tests, parallel runs)
  • Built internal Python and Bash accelerators (data validation, recurring tasks, documentation generation)
  • Grew from junior to technical lead on some projects
Talend for Big Data Hive HBase Cloudera CDH/CDP Python Bash Jenkins
University of Tours

Research Assistant (NLP & Machine Learning)

Sep 2021 - Aug 2022
Blois

Responsibilities:

  • Applied research in sentiment analysis and document classification
  • Created Daxmod, an open-source Python library for text classification
  • Benchmarked embeddings, tokenizers and predictive models
Python Scikit-Learn TensorFlow