Freelancer profile translated to English.
Back to original languageAbout Sebastien
FullStack Developer | React.js | Typescript | GIS | +5 years XP
I build robust, performant, and scalable web applications, from idea to final product. Specializing in advanced mapping, AI integration (LLM, RAG, automations), and technical optimization, I have supported key players in energy, agriculture, and finance.
🔧 Key Technical Stack
Languages: Javascript/Typescript, Python, SQL, HTML & CSS
💡 Recent Experiences
Hexagone.solar(Paris) – Mapping & AI CRM for energy prospecting: automatic roof detection, prospect management, route planning via data.gouv.fr API, real-time tracking with Supabase/PostGIS.
Vesimusic(Paris) – Full-stack web application for connecting musicians/venues, searching and booking dates, managing messaging, calendar/availability, Stripe payments, moderated reviews, and admin area, with i18n, security (rate limiting, auth, Turnstile), and analytics.
🎯 Method & Commitments
Clean Architecture: Scalable, documented, maintainable solutions.
Optimization: Performance, UX/UI, SEO, relevant AI integration.
Support: Transparent communication, post-deployment support, and continuous improvement.
🔥 Why Me?
✔ Confirmed Full-stack: Reactive frontend, solid backend, AI, and mapping.
✔ Field Experience: Business applications with real stakes (scalability, GDPR).
✔ Rigor & Autonomy: Complex project management, meeting deadlines.
📨 Response within 24 hours!
French
Native or bilingual
Spanish
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km), Lyon (up to 50km), Marseille (up to 50km), Rennes (up to 50km), Toulouse (up to 50km)
Experience
- Actea
On Malt
Integration of SeLoger API leadsREAL ESTATEMay 2026 - June 2026Integration of leads from the SeLoger professional platform into the intelligent matching algorithm of the Actea-conseil.fr in-house CRM.Implementation of webhooks to detect and retrieve leads, add them to the PostgreSQL database, and then integrate the data into the matching algorithm between clients and properties. - ActeaIntegration of SeLoger Leads & Commercial Spaces & Invisible Properties APIsREAL ESTATEApril 2026 - May 2026 (1 month)Integrations of AVIV / SeLoger APIs with websocket and cronjob, Postgres migration and installation on a private web server, optimization of SSR/CSR performance and UX/UI design of the Actea-conseil in-house CRM.
- VesimusicWeb developer for ConcertStory, a matching platform (musicians ↔ concert venues)SOFTWARE PUBLISHINGSeptember 2025 - April 2026 (7 months)Paris, France
Full-stack web application for connecting musicians/venues, searching and booking dates, managing messaging, calendar/availability, Stripe payments, moderated reviews, and admin area, with i18n, security (rate limiting, Turnstile), and observability.
Features:
- Accounts & flows: registration, login, email verification, account reset/completion, notification preferences, account deletion/reactivation.
- Profiles: rich wizards/forms for musicians and venues (genres, rates, equipment, bio, media, contact info, etc.).
- Search & discovery: search with filters (dates, area/map, genre, gig type, equipment); public musician/venue profiles.
- Bookings: request/accept/reject/cancel flow; conflict and status management; Stripe integration (payment intents, webhooks); receipts (API + PDF).
- Messaging: conversations, messages, indicators (read, typing); real-time via WebSocket server + Redis (pub/sub).
- Scheduling: availability, templates, exceptions, synchronization/caching (dedicated scripts).
- Reviews: ratings and comments after concert, moderation and flagging; protected admin area (reports) by authorized user list.
- Content & compliance: legal pages (T&Cs, Privacy Policy, FAQ, Imprint); cookie consent; GDPR compliance within the product scope.
- Quality: tests (Vitest), E2E Playwright, commitlint / Conventional Commits, semantic-release; Docker Compose deployment.
- Observability: Posthog and Betterstack for analytics and logging.
Reviews
Recommendations
GA
JJ
+1
These freelancer profiles also match your criteria
Agatha Frydrych
Backend Java Software Engineer
4.7
(3)
2
Baptiste Duhen
Fullstack developer
4.6
(4)
5
Amed Hamou
Senior Lead Developer
4
(2)
7
Audrey Champion
Web developer
4.3
(3)
4
Education
- Software Developer DesignerOpenClassrooms2025Développement Full-stack Javascript - Typescript, state management, architecture logicielle, bonnes pratiques de code, méthode agile, optimisation performances, bases de données SQL & NoSQL, cloud AWS & Google, React, NodeJs, ExpressJs, Redux & Zustand, Zod, développement d'API, sécurité OWASP
- Web/Mobile Web DeveloperOpenClassrooms2023Formation longue en développement web full-stack, avec HTML,CSS, Javascript, React,React-router, Redux, NodeJs, Express.Js, MongoDB, Git et Github, management agile, méthode agile, Réferencement SEO, performances d'un site web avec Google LightHouse, création et utilisation des maquettes depuis Figma pour l'intégration web, mise en place du back(end avec NodeJs, ExpressJs et MongoDB. Green-IT, sécurité des sites web