Freelancer profile translated to English.
Back to original languageAbout Aurelien
Fractional CTO & Data Architect Expert (SQL/NoSQL) | 19 years of experience
You are facing scalability challenges, exploding Cloud costs, or a data infrastructure slowing down your growth? I assist companies (SMEs, mid-sized, institutional) in their digital transformation, from strategic audit to technical deployment.
Capable of intervening at both the decision-making (Executive Committee/Board) and technical ("Hands-on") levels, I support you across 3 major areas:
🚀 Technical Direction (Fractional CTO): IT internalization, roadmap definition, team management, and operational cost rationalization (FinOps).
🏗️ Cloud Architecture & Migration: Redesigning legacy architectures to the Cloud (AWS, GCP, OVH), micro-services design, and automation (Docker, CI/CD).
📊 Data Expertise & RDBMS Performance: Modeling, migration, and surgical optimization of databases under very high load (PostgreSQL, MongoDB, SQL Server, MySQL).
My latest achievements:
MyUnisoft: Architecture of a high-performance accounting data ingestion engine (Node.js/TypeScript).
Haute Autorité de Santé (HAS): Audit and complex migration of critical medical databases (MySQL to PostgreSQL).
RDBMS Task Force: Audits and query/indexing optimizations for multiple players (TurnUp, Rhinov, Matelex, etc.).
Whether it's structuring your tech department, halving your query times, or designing robust infrastructure, I bring you pragmatic and results-oriented expertise.
Let's discuss your challenges!
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km), Bordeaux (up to 10km), Nantes (up to 10km), Lyon (up to 10km), Lille (up to 10km)
Experience
- MyUnisoftSoftware & Data ArchitectSOFTWARE PUBLISHINGJanuary 2025 - Today (1 year and 5 months)Paris, FranceDesign and development of an automated massive data integration system to accelerate new client onboarding. I managed the entire project lifecycle, from defining the target architecture to the "hands-on" development of parsing solutions for complex accounting files (FEC, TRA, mdb).🎯 Key Achievements & Impact:Architecture & Governance: Definition of the target architecture, writing technical specifications, and alignment through steering committees (CoPil).Software Engineering (Hands-on): Development from scratch of a high-performance integration engine in Node.js and TypeScript, capable of ingesting and processing heterogeneous and heavy formats.Data Management & Reliability: Securing accounting data migration flows. Ensuring data integrity, traceability, and transformation during client integration.🛠️ Technical Environment:Node.js, TypeScript, Docker, Data Architecture, Parsing/ETL, Financial Flow Engineering.
- HAS (Haute Autorité de Santé)Data Expert & RDBMS Architect (Migration & Modernization)MEDICALSeptember 2025 - December 2025 (3 months)Paris, FranceLeading a comprehensive data expertise mission, from strategic audit to the effective migration of a critical database infrastructure. The main challenge was to modernize the data foundation (moving from MySQL to PostgreSQL) while ensuring the absolute integrity and security of medical information.🎯 Key Achievements & Impact:Strategic Audit & Consulting: In-depth analysis of the existing architecture, formulation of technical recommendations, and validation of feasibility through the creation of a Proof of Concept (POC).Data Architecture & Modeling: Design of the target architecture and complex modeling of the new database (SIAM3). Leading and executing the complete migration from the old environment (SIAM2).Data Engineering & Automation: Design and development from scratch of automated ETL pipelines in Python. Scripting and containerizing deployments via Docker to ensure reproducible and secure environments.🛠️ Technical Environment:PostgreSQL, MySQL, Python, Docker, Data Architecture, Data Modeling, ETL, Indexing, SQL Audit.
- UPPCTO & Cloud Architect (E-commerce Sector)E-COMMERCENovember 2024 - March 2025 (3 months)Paris, FranceComprehensive technical support to secure and optimize the technological infrastructure of an e-commerce platform. The goal is to ensure maximum availability of transactional services and guarantee the performance of acquisition campaigns.🎯 Key Achievements & Impact:Development & API: Design and development of robust APIs to support e-commerce activities and facilitate third-party integrations.Deliverability & Strategic Emailing: Technical lead for emailing campaigns. Strict monitoring and continuous optimization of deliverability and domain name reputation (DNR) to secure conversion rates.Cloud Infrastructure & DNS: Design, deployment, and security of a scalable Cloud infrastructure. Fine-tuning of DNS zones to ensure absolute uptime and optimal browsing performance for users.🛠️ Technical Environment:Cloud Architecture, DNS, REST API, Emailing / Deliverability, E-commerce.
Reviews
Wandrille
Chef de projet - Haute Autorité de Santé - IT
Several months project
-
Reviewed on 12/17/2025
I had the opportunity to collaborate with Aurélien as a project manager on a database modeling mission. His approach was exemplary: he demonstrated strong technical expertise, perfectly mastering the concepts and tools needed to design a robust and scalable architecture, with great pragmatism.
Beyond his skills, Aurélien is a pleasant and highly professional individual, which facilitated communication and cohesion within the team. His great adaptability allowed him to quickly adjust to project constraints and meet tight deadlines without compromising the quality of the deliverable.
I highly recommend Aurélien for any project requiring technical expertise, rigor, and interpersonal skills.
Baptiste
Dately SAS
Reviewed on 10/14/2024
The mission with Aurélien went smoothly; he was responsive, autonomous, and accommodating throughout, completing the mission quickly and effectively. The subject concerned structuring PostgreSQL tables and designing optimized queries associated with these tables.
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Education
- EngineerCNAM2008