Freelancer profile translated to English.
Back to original languageAbout Lucien
Web DeveloperReact.js | Next.js | TypeScript | Javascript (5 years of experience)
Is yourapplicationreaching its limits in performance, stability, or scalability?
I step in to take over existing systems or refactor your product with a modern stack:React.js, Next.js, TypeScript, Javascript,to deliver a robust, maintainable, and future-proof application.
For 5 years, I've been supporting startups, SMEs, and large corporations on projects ranging from e-commerce toB2B SaaS.
My role: transforming your ideas into reliable applications, with a particular focus onscalability, security, and user experience.
Among my achievements:
-> Celeste:e-commerce using Next.js withcustom funnelsand multi-currency management, optimized for conversion.
-> Yonev:integration of PayGreen payment and Google login, enabling+50% revenue for partner restaurants.
-> TechIns8:AI-powered job aggregation SaaS with+3000 active users.
-> Brandshelter:cybersecurity application monitoring 350 million domains to protect brands like Rolex, EDF, Orange, or Google.
-> Novanea:digitized real estate platform with scraping, automatic matching, and sales pipeline.
My approach is turn-key: a stable, documented, and scalable product that doesn't force you to constantly fix the same problems.
Stack & methods:React.js, Next.js, TypeScript, Javascript, Tailwind, Prisma, scraping, CI/CD, ShadCn, LangChain, RAG,test automation, and monitoring.
Want to launch a web project or strengthen your team with a specialized developer?
Contact me:I offer a video callto understand your needs and present a concrete approach.
Response guaranteed within 24 hours.
English
Fluent
French
Native or bilingual
Can work on-site
Paris (up to 50km), Marseille (up to 50km), Lyon (up to 50km), Nantes (up to 50km), Toulouse (up to 50km)
Experience
- Toloxa
On Malt
Toloxa: Embeddable Iframe ModuleSOFTWARE PUBLISHINGMay 2026 - June 2026 (1 month)Paris, France→ Mission Objective:Development of an iframe module to integrate a technical diagnostic AI assistant into B2B client websites, with access security and per-company branding customization.→ Achievements:*Adapted existing React interfacefor cross-domain iframe operation with anonymous user mode → seamless integration on any client site, without authentication friction.*Dual token security system(integration key + session token) with server-side domain binding → protection against token theft, restricted access to authorized domains.*Turn-key JavaScript loaderfor automatic iframe injection → integration in under 10 minutes for B2B clients, zero technical expertise required.*Branding customization per tenant(logo, colors, welcome messages) via CSS variables → each client perceives the assistant as their own tool.→ Technical Stack: React, Vite, TypeScript, Tailwind, Python, WebSocket - sooweWeb Developer React.js | Next.js | TypescriptE-COMMERCEFebruary 2026 - Today (4 months)Paris, France→ Mission Objective: Redesignand complete integration of an affiliate-monetized beauty price comparator, with mobile-first UX modernization and enhanced advertising administration tools.→ Achievements:*UI/UX Redesignfrom existing mockups + integration of 10 pages on theexisting Next.js project→ modern experience, fluid navigation,API connection maintained.*Extension of the admin back-office(catalog/blog ad slots, multi-image carousel) → client autonomy in monetization, zero technical intervention.*SEO and performance optimization(lazy loading, Core Web Vitals, sitemap) → better ranking, reduced loading times.→ Technical Stack: Next.js, React, Figma, REST API, Technical SEO
- SylaWeb Developer React.js | Next.js | TypescriptEDUCATION AND E-LEARNINGFebruary 2026 - Today (4 months)Paris, France→ Mission Objective: Development of an AI chatbot integrated into a web applicationfor a Qualiopi consultant, replacing weeks of email/phone collection with a guided conversational questionnaire and automatic final Word document generation.→ Achievements:*Conversational assistant web applicationstructured (66 questions, 10 themes) with session saving and resuming → fluid data collection, autonomous clients, zero manual follow-up.*LLM integration for intelligent follow-upin case of insufficient answers → guaranteed data quality, time savings for the consultant.*Secure invitation system via magic link + automatic generationof the Word document conforming to the France Compétences template → ready-to-use deliverable, protected methodology.→ Technical Stack: Next.js, React, OpenAI API, Node.js, TypeScript
Reviews
Recommendations
+2
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Education
- Application Developer, Computer Programming, Specific ApplicationsÉcole Ri72022Développeur d'applications, Programmation informatique, applications spécifiques
Certifications
- Advanced Python: Practical Database ExamplesLinkedIn Learning2024
- The Essentials of LangChain for Python DevelopmentLinkedIn Learning2024