Freelancer profile translated to English.
Back to original languageAbout Célia
I help SaaS and product teams deliver reliable, fast, and maintainable web platforms.
Tech Lead Fullstack TypeScript / Next.js, with 8+ years of experience in product, architecture, performance, and DX.
I led end-to-end projects at Helm and papernest: SaaS from scratch, 40+ sites migrated to Next/Vercel, UX scores 98+, p95 API <100ms.
I use AI when it truly improves delivery: dev agents, documentation/search, internal workflows, business automation.
I am comfortable with tasks that require understanding the product, clarifying the architecture, writing code, structuring the stack, and making the team more effective.
My main areas:
- SaaS applications and web platforms in TypeScript, React, Next.js, Node/Bun
- Frontend/fullstack architecture, monorepos, design systems, DX, CI/CD
- Legacy/WordPress migrations to Next.js/Vercel without breaking SEO or performance
- Web performance, Core Web Vitals, observability, product reliability
- API integrations, business workflows, automation, and internal tools
- Applied AI: agents, RAG/search, code-aware documentation, developer workflows
I prefer demanding product environments, small teams that want to move fast and clean, and assignments where product judgment is as expected as execution capability.
French
Native or bilingual
English
Native or bilingual
Can work on-site
Paris (up to 50km)
Experience
- HelmCTO / Founding EngineerTRAVEL AND TOURISMJuly 2025 - Today (11 months)Paris, FranceEnd-to-end development and architecture of an ops-first SaaS for tour operators: staffing, planning, guide workflows, bookings, Bókun/WooCommerce integrations, and local sync with Zero. Product and platform architecture with Next.js, Bun/Elysia, Prisma, Tailwind, observability, and cloud infrastructure. Creation of Docbot, a CLI agent that analyzes code + docs to maintain documentation, changelog, and internal search.
- papernestTech LeadTECHMay 2023 - July 2025 (2 years and 2 months)Paris, FranceTech Lead on the acquisition stack: migration of 40+ WordPress properties to Next.js/Vercel, preserving SEO, standardizing DX and Lit Web Components. Creation of klee, a Bun/Elysia API replacing WordPress endpoints with Terraform infrastructure, reducing p95 latency from several seconds to <100ms. Delivery of acquisition systems: energy comparator, reviews, Twilio/ElevenLabs AI callback.
- Kazaar / HyperspreadFront-End DeveloperSOFTWARE PUBLISHINGJanuary 2021 - May 2023 (2 years and 4 months)Development of product systems for a retail communication SaaS: Next.js, GraphQL, Tailwind, multi-agency workflows, social posting, paid ads, and analytics. Building a React Native/Expo app from scratch and setting up a monorepo design system with Turborepo/TSDX.
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Education
- Bachelor of Digital Project ManagementEpitech Digital2019Formation produit, web, marketing digital et gestion de projet.
- Digital EntrepreneurshipHEC Paris2020Programme court en entrepreneuriat digital : stratégie, produit, acquisition et lancement de projet.