
Haroune Mohammedi
Senior Data Engineer | PySpark, Big Data
Salary / Daily rate
Paris, France
Freelance
Skills
About me
Intro
Senior Data Engineer with 9 years of expertise in large-scale data pipelines and Big Data solutions. Achieved dramatic performance improvements at ENGIE migrating legacy ETL from PL/SQL to PySpark, reducing execution time from weeks to hours with significant cost savings. Specialized in Databricks, PySpark, MLOps platforms, and end-to-end pipeline optimization for high-volume data processing.
Work experience
Senior Data Engineer
ENGIE
Feb 2024 - Present
2 years 9 months
Paris, France
➔ Designed and implemented large-scale data pipelines processing energy consumption data at 30-minute frequency, handling high-volume datasets in a Big Data environment (Databricks, PySpark). ➔ Migrated legacy ETL workflows from PL/SQL to PySpark on Databricks, reducing execution time from several weeks to a few hours and generating substantial compute cost savings. ➔ Optimized distributed data processing through Spark performance tuning, partitioning strategies, and scalable architecture design. ➔ Led projects end-to-end: requirements analysis, architecture design, development, testing, deployment (MEP), and production support (RUN). ➔ Developed strong functional expertise in the energy domain, with a genuine interest in business challenges and operational processes. ➔ Ensured data quality, reliability, monitoring, and continuous improvement of production pipelines.
Senior Data Engineer
Quadratic
May 2022 - Present
4 years 6 months
Paris, France
➔ Designed and implemented a real-time blockchain data integration pipeline, synchronizing on-chain smart contract events into MongoDB, bridging Web3 data to Web2 applications. ➔ Designed MongoDB schema and data models optimized for query performance, translating raw blockchain event structures into clean, structured documents. ➔ Defined GraphQL schema and data access patterns to expose structured contract and transaction data to frontend consumers. ➔ Built automated integration and unit test suites ensuring data integrity and pipeline reliability.
BIGmama Technology
Sep 2017 - May 2022
4 years 9 months
Algeria
Software Engineer
Jul 2019 - May 2022
2 years 11 months
Algeria
➔ Core developer of an MLOps platform enabling end-to-end machine learning lifecycle management. ➔ Built features for automated experiment tracking, ensuring reproducibility and structured model evaluation. ➔ Implemented one-click model packaging (Docker) and deployment workflows on Kubernetes, simplifying productionization for data teams. ➔ Developed backend services in Flask with a strong focus on extensibility, clean architecture, and long-term maintainability. ➔ Translated business requirements into scalable technical solutions, participating in architecture decisions and product evolution. ➔ Evaluated and integrated open-source technologies, selecting pragmatic solutions aligned with product and operational constraints. ➔ Developed a strong product mindset, prioritizing user value, delivery impact, and iteration speed over unnecessary complexity. ➔ Collaborated asynchronously using Slack and GitLab, contributing to clear technical discussions and structured decision-making.
Data Engineer
Sep 2017 - Jul 2019
1 year 11 months
Hydra, Algeria
➔ Built and deployed a data-intensive application using Akka, Spark, Kafka, Elasticsearch, and Firebase, focusing on high-availability, fault tolerance, and scalability. ➔ Developed an internal sdk using scala for integrating different dynamic parts of our stack (Firebase, Kafka, Akka ..ect), focusing on maintainability and extensibility. ➔ Contributed on the design of many complex applications based on the actor model. ➔ Provisioned Ansible recipes for internal information system setup/security (Gitlab, Apt Mirror, SFTP, 2FA Authentication).
Education
Université des Sciences et de la Technologie 'Houari Boumediène'
Master's degree, Artificial Intelligence
2017 - 2019
2 years 1 month
Université des Sciences et de la Technologie 'Houari Boumediène'
Bachelor's degree, Computer Science
2014 - 2017
3 years 1 month
Licenses & certifications
Data Engineer Professional
Issued: Oct 2026