Freelancer profile translated to English.
Back to original languageAbout Etienne
Looking for a senior fullstack developer capable of designing and delivering a complete web application — from architecture to deployment?
For 7 years, I've been building robust React / Next.js applications for demanding environments: SaaS, internal tools, business platforms. My approach: understand your business needs first, then choose the right stack.
What I deliver:
→ Performant web applications in React, Next.js, TypeScript, and Node.js
→ Reliable GraphQL and REST APIs, designed for scalability
→ Clean and scalable architecture (DDD, automated tests, CI/CD)
→ Deployment and infrastructure: Docker, Kubernetes, Terraform, GCP
What sets me apart: data-intensive applications
I have rare expertise in processing and displaying large volumes of data on the web — real-time dashboards, massive table virtualization, cost and performance optimization on BigQuery.
Concrete case — Renault Group (4 years, 3 applications delivered autonomously):
Web tools for the group's connected vehicle fleet (~2.3 million vehicles/year):
• Vehicle diagnostics platform — ingestion of 1M lines/day, used daily by 200+ engineers
• Geolocation tool — complete mapping interface for fleet tracking
• Remote configuration platform — deployment of software campaigns across the entire fleet
Result: BigQuery costs reduced from 100 GB to 10 MB per query, response times from 15s to 5s.
17 projects delivered on Malt, 5/5 stars.
End-to-end autonomy: architecture → development → deployment.
Let's talk about your project.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km), Marseille (up to 50km), Bordeaux (up to 50km), Toulouse (up to 50km), Lyon (up to 50km)
Experience
- MEDIADSFullstack web developerDIGITAL AND ITApril 2026 - Today (2 months)Paris, FranceDevelopment of the version 2 of the Mediads platform.Reflection and creation of the necessary features for the autonomy of Mediads clients.
- Renault GroupeFullstack web developerAUTOMOBILESeptember 2021 - March 2026 (4 years and 6 months)Toulouse, FranceFreelance Full Stack developer integrated into the product teams of Renault Group, working on critical applications processing data from the group's connected vehicle fleet (~2.3 million vehicles sold/year).▸ Vehicle diagnostics platform — Designed and developed an application for processing and visualizing errors reported by connected vehicles. 5 TB database in production, ingesting 1 million lines/day. Redesigned the BigQuery architecture (via Terraform) reducing the scanned volume per query from 100 GB to ~10 MB and response times from 15s to 5s. Used by 200+ Renault engineers.▸ Geolocation tool for road data — Independently developed a mapping interface (Leaflet + geocoding) to define geographical areas in France. The tool allows engineers to configure where Renault vehicles emit road condition data, with the goal of selling this data to local authorities. Deployed a Node.js API on Kubernetes with an asynchronous queue system.▸ Remote vehicle configuration platform — Developed an application to create software configuration campaigns applied to the group's vehicle components. Interface used by Renault engineers to remotely configure software versions of parts, impacting diagnostic events reported by the fleet.Environment: TypeScript, React, Node.js, GraphQL, Apollo, REST, PostgreSQL, BigQuery, Firebase, Terraform, Docker, Kubernetes, Tailwind CSS, Shadcn/UI, CI/CD, GCPMethodology: Agile — 3-week sprints, 3-month PI. Team of 5 developers.
- People VoxFullstack web developerTECHMarch 2020 - August 2021 (1 year and 5 months)Toulouse, FranceDesign and development of a secure electronic voting platform for CSE elections, within a team of 3 developers.▸ Developed the entire application (GraphQL backend + React frontend) end-to-end: architecture, development, automated tests (Jest, Cypress)▸ Solution now in production, used by 4,000+ organizations (Europcar, Binance, Lenovo, British Airways...) — rated 4.8/5 on Trustpilot — CNIL, GDPR, and ISO 27001 compliant▸ Handled complete end-to-end features: from architectural design to deploymentStack: TypeScript, React, Node.js, Apollo, GraphQL, MongoDB, Jest, Cypress
Reviews
Thibault
People Vox
Reviewed on 5/11/2020
Etienne has been with us on a project for a minimum of 4 months as a JS Full Stack developer (React, Node, GraphQl). He is a very attentive, responsive, organized web developer, with a very strong work ethic (structured and clean!). He is a great asset to a development team! Highly recommended!
Thibault
People Vox
Reviewed on 9/17/2021
Recommendations
SD
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Education
- Computer EngineeringExia Cesi2019