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David LaffontDL

David Laffont

Fullstack Developer | React.js | Next.js | Stripe

€400/day
2 projects
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About David

Fullstack Developer | React.js | Next.js | Stripe

I have assisted several clients in the design and deployment ofmarketplacesand custom web applications:

*Matching platformwith multi-party payment management via **Stripe Connect**, dynamic commissions, and automated seller onboarding.

*Transactional sites and SaaSwith user management,Stripe Billingsubscriptions, dashboards, and business workflows.
  • **Concrete gains**: platform in production in less than 3 months, reduction in payment errors, user experience validated by early adopters.

I am aFullstack Developerspecializing inmarketplacesandStripeintegration. I handle projects from scoping to production, with a pragmatic approach: building a useful, stable product aligned with your business objectives.

I offer aturnkeyapproach: you get a functional, maintainable, and scalable product. The code is structured, performance is optimized, and user experience remains central.

Technical Stack**: **React.js**, **Next.js**, Node.js, REST API, **Stripe(Connect, Billing, Checkout, Webhooks), SQL and NoSQL databases. I work with **agile methodologies**, with short cycles and regular communication.

Looking for aFullstack Marketplace React.js Next.js Stripe Developercapable of bringing your project to life? Contact me for a video call, I'll respond within 1 hour.
  • French

    Native or bilingual

  • English

    Conversational

Can work on-site
Paris (up to 50km), Lyon (up to 50km), Bordeaux (up to 50km), Lille (up to 50km), Marseille (up to 50km)

Experience

  • initative demain
    Malt logoOn Malt
    Fullstack Developer | React.js | Next.js | Stripe
    CIVIC AND SOCIAL ORGANIZATIONS
    June 2026 - Today (1 month)
    Toulouse, France
    **CONTEXT**:


    Taking over, securing, and industrializing a web marketplace for events and ticketing for the associative sector (associations, local authorities, artisans), in preparation for its launch. React/Vite + Supabase + Stripe Connect application initially built in no-code, requiring stabilization and production deployment.

    **ACHIEVEMENT**:


    Full project delivery in batches, from audit to production deployment:
    • Technical audit across 7 pillars + business aspects: critical flaw identified, side effects of a past fix verified (~30 points), triple payment defense validated.
    • Migration from managed infrastructure to proprietary infrastructure: Postgres (84 migrations, 35 tables, RLS, triggers, ~40 RPCs, pgmq/pg_cron/vault), 22 Deno Edge Functions, Google OAuth, Resend emails, Storage, Vercel hosting + domain + SSL.
    • Server security hardening (RLS, Realtime channels, CORS) and compliance (legal notices, cookies, GDPR).
    • Financial stabilization (unified pricing, Stripe fees passed on, variable commission) and Stripe Connect safeguards (delayed payout J+7, refunds/cancellations).
    • Stripe production deployment (TEST to LIVE), acquisition (dynamic OG tags, social sharing, PWA).


    **RESULTS**:
    • Application 100% migrated to proprietary infrastructure (Vercel + Supabase), zero no-code dependency, in production.
    • Secured backend: 35 tables, RLS, triggers, RPC SECURITY DEFINER, 22 Edge Functions.
    • Stripe Connect multi-party payment audited and stabilized.
    • Project structured in batches, delivered iteratively with compliance guarantee.


    **TECHNICAL STACK**:


    React, Vite, TypeScript, Tailwind, Supabase (PostgreSQL, RLS, Deno Edge Functions, Storage, Realtime, pgmq, pg_cron, Vault), Stripe Connect, Resend, Leaflet, Vercel.
    Fullstack Developer React.js Next.js Stripe Marketplace
  • factudevis
    Fullstack Developer | React.js | Next.js | Stripe
    SOFTWARE PUBLISHING
    April 2026 - April 2026
    Montpellier, France
    **CONTEXT**:


    Design and development of aninvoicing SaaSfor French **micro-entrepreneurs**, compliant with 2027 fiscal obligations.



    **ACHIEVEMENT**:


    End-to-end development of a complete application in a **Next.js monorepo**:

    *Stripeintegrated: subscriptions (Free/Pro), **Checkout, customer portal, webhooks**, and payment management.
    • Generation of compliantPDF quotes and invoiceswithFactur-X(e-invoicing standard EN 16931).
    • Secureelectronic signature(unique token, SHA hash, signer IP).
    *Automatic payment remindersat 3 levels (Vercel crons, legal L441-10 notices).

    *Recurring invoices(monthly/quarterly), quote-to-invoice conversion.

    *Statisticsdashboard, purchase register,URSSAFdeclaration, threshold simulators.
    • **Push notifications**, global search, rate limiting (Upstash Redis).


    **RESULTS**:
    • **Complete SaaS in production**, deployed on Vercel.
    • **40+ Server Actions**, 9 Prisma models, full fiscal compliance.
    • Monetization operational viaStripe(Free/Pro).
    *Factur-X compliantwith the 2027 standard (EN 16931).

    *Scalableandsecurearchitecture (NextAuth, rate limiting, HSTS).



    **TECHNICAL STACK**:


    Next.js 16(App Router),React19, TypeScript,Prisma, MongoDB, Stripe
    (Checkout, Webhooks, Portal), **Resend, TailwindCSS, shadcn/ui**, Vercel, Upstash Redis.
    Fullstack Developer React.js Next.js Stripe SAAS
  • GardenStay
    Fullstack Developer | React.js | Next.js | Stripe
    E-COMMERCE
    February 2026 - March 2026 (1 month)
    Montpellier, France
    **CONTEXT**:


    Marketplaceplatform connecting garden owners with individuals wishing to rent exceptional outdoor spaces for private events.

    **ACHIEVEMENT**:


    End-to-end design and development of a complete marketplace:

    *Multi-party payment systemvia **Stripe Connect**: dynamic platform commissions, automatic payouts to hosts, and automated **refunds**.

    *Time-slot booking systemwith availability calendar, 3-tier cancellation policy, and **iCal synchronization**.
    • Real-timeinternal messaging**, **two-way reviewsystem, and comprehensiveadmin dashboardwith KPIs.
    *Stripe Connect onboardingfor hosts with identity verification.



    **RESULTS**:
    • Platform delivered and deployed inproduction(Vercel + Render).
    • **9 functional modules**: auth, listings, booking, payment, messaging, reviews, admin, iCal, accounting.
    *Stripe Connect operationalwith dynamic commission and automated refunds.
    • Admin dashboard with user, listing, and booking management, and real-time **KPIs**.


    **TECHNICAL STACK**:


    Next.js(App Router),React.js, Express.js**/TypeScript, **Stripe(Connect, Webhooks),PostgreSQLvia Prisma ORM, Supabase, Vercel, Render.
    Fullstack Developer React.js Next.js Stripe Marketplace

Reviews

5.0

Out of 2 ratings

A

Alan

Migration complète d'une application no code - initative demain

Reviewed on 7/11/2026

Mission perfectly executed. Context: I had developed my application (a marketplace with ticketing and payments) on Lovable, a no-code tool assisted by AI. These platforms are great for bringing an idea to life without being a developer, but they have a limit: you remain dependent on the tool, its monthly subscription, and you don't truly control your own code. At some point, to launch seriously and grow, you need to "exit" the tool and own your technology. This is exactly what David accomplished. He migrated my entire application from Lovable to an independent and professional infrastructure (Supabase for the database and backend, Vercel for hosting, GitHub for code): complete database, server functions, security, Google authentication, Stripe payments, email system, domain name. Everything was transferred cleanly, tested in real conditions, and works perfectly. I no longer depend on any third-party tool, I am now fully the owner of my platform, and I save the monthly subscription in the process. Beyond the technical aspects, what I remember is his seriousness and his teaching skills. David takes the time to explain each step clearly, answers all my questions (even the most technical ones) in a structured way, and anticipates points of concern before I even raise them. As a non-technical founder, this is exactly the partner I needed: someone who simplifies without ever oversimplifying, and in whom I can have total trust. The migration was delivered within the announced deadlines, and his approach by prioritized batches allowed me to manage my budget serenely, with exemplary transparency on costs. If you have built your project on a no-code tool (Lovable, Bubble, or other) and want to professionalize it to scale, I can only recommend David with my eyes closed. A great professional, both humanly and technically. I will continue the rest of my project with him without the slightest hesitation.
A

Alan

Excellent audit, pédagogie au top. - initative demain

Reviewed on 7/2/2026

Great collaboration for the technical audit of my platform. I am a non-technical founder, and that's precisely where David makes a difference: he explains things remarkably well, each complex point was explained simply, without jargon, so that I truly understood what he was talking about. Very available and responsive throughout the discussion, he clearly answers every question. The report is clear, well-structured, and complete: a real in-depth, honest, and objective work. He doesn't oversell anything, distinguishes what is solid from what needs improvement, and even reduced some costs himself after reviewing the code. This transparency in pricing built my confidence. I am continuing the collaboration with him for the rest of the project. I recommend him.

Recommendations

SG
CR
CC
+2
Sylvain Garcia and 4 other people have recommended David

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Education

  • RNCP Level 6 Title
    La Capsule
    2024
    Développeur d'application web et mobile

Skill set

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