Freelancer profile translated to English.
Back to original languageAbout Lucien
Web DeveloperReact.js | Next.js | TypeScript | Javascript (6 years of experience)
Is yourapplicationhitting its performance, stability, or scalability limits?
I step in to take over existing projects or refactor your product with a modern stack:React.js, Next.js, TypeScript, Javascript,to deliver a robust, maintainable, and future-proof application.
For the past 5 years, I have been supporting startups, SMEs, and large corporations on projects ranging from e-commerce toB2B SaaS.
My role: transform your ideas into reliable applications, with a particular focus onscalability, security, and user experience.
Among my achievements:
-> Celeste:e-commerce under 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 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 turnkey: 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.
Looking 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
- Devlakai
On Malt
Orkeste.ai Homepage Conversion AuditTECHMay 2026 - June 2026 (1 month)Paris, FranceTechnical and conversion audit for an AI agent orchestration SaaS application.Analysis of the public funnel, landing page, pricing page, signup process, onboarding, and initial product friction points.Implementation of a customPlausible trackingwithin the repo to measure page views, CTA clicks, signup steps, errors, and key conversion events. Configuration of Plausible goals and funnels, exclusion of Lovable internal traffic, resolution of Netlify deployment issues, and validation of events in production.Technologies: React 18, Vite, TypeScript, Supabase, React Router, Netlify, Plausible Analytics, GitHub, Lovable, Stripe, Technical SEO, CRO. - ToloxaToloxa: Embeddable Iframe ModuleSOFTWARE PUBLISHINGMay 2026 - June 2026 (1 month)Paris, France→ Mission Objective:Development of an iframe module to integrate an AI technical diagnostics assistant into B2B client websites, with access security and branding customization per company.→ Achievements:*Adaptation of the 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.*Turnkey 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
- sooweReact.js | Next.js | Typescript Web DeveloperE-COMMERCEFebruary 2026 - Today (6 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 an existing mockup + integration of 10 pages on the existingNext.js project→ modern experience, smooth user journey,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 referencing, reduced loading times.→ Technical Stack: Next.js, React, Figma, REST API, Technical SEO
Reviews
Recommendations
+2
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Education
- Développeur d'applications, Programmation informatique, applications spécifiquesÉcole Ri72022Développeur d'applications, Programmation informatique, applications spécifiques
Certifications
- Advanced Python: Practical Database ExamplesLinkedIn Learning2024
- The Essentials of LangChain for Python DevelopmentLinkedIn Learning2024