Freelancer profile translated to English.
Back to original languageAbout Julien
Fullstack Developer specializing in React / Next.js and NestJS, with 5 years of experience including missions in critical environments (SOC Airbus, BoostAeroSpace via Sopra Steria).
I work on complete projects — from technical architecture to user interface — with a particular focus on code quality, performance, and long-term maintainability.
What I bring:
End-to-end JS/TS Fullstack: React, Next.js, NestJS, PostgreSQL/Prisma, REST APIs
Design sensitivity & creativity: GSAP animations, polished interfaces, refined user experience
Industrial rigor: methodology acquired on large-scale, high-stakes projects (cybersecurity, aerospace)
Product vision: founder of Nisora, a NIS2 compliance B2B SaaS — I know how to design, deliver, and maintain a product
Available for full-remote missions, daily rate €450.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km), Sens (up to 50km), Auxerre (up to 50km)
Experience
- SopraSteria - Client AirbusLead Frontend DeveloperAVIATION AND AEROSPACENovember 2023 - Today (2 years and 9 months)Paris, France
- Complete overhaul and structuring of a nearly blank React/Vite application: implementation of the frontend architecture, selection and integration of TailwindCSS and Shadcn (design system, theming), code conventions — sole frontend dev in a pair with a backend developer.
- Development of 6 business modules for SOC analysts: multi-hostname EDR scanner, TheHive case management, observable addition, Strelka analysis, FireEye sandbox, monitoring and launching automated Splunk tests.
- Application used daily by ~10 analysts, with a measurable reduction in incident processing time.
- React training provided to 5 analysts to make them autonomous in developing new modules.
- Sopra Steria - Client BoostAeroSpaceFullstack DeveloperAVIATION AND AEROSPACEAugust 2021 - November 2023 (2 years and 3 months)Courbevoie, France
- Complete refactoring of a legacy React application (2019) with migration from TypeScript and class components to function components.
- Performance improvements, clean code.
- Development and adaptation of Django Rest Framework endpoints on the backend.
- Complete UI/UX redesign of the application.
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Education
- Web Development Master's DegreeParis Ynov Campus2022Développement Web Fullstack