Freelancer profile translated to English.
Back to original languageAbout Gérald
I design and deliver end-to-end web, PWA, and SaaS applications — from technical architecture to production deployment — autonomously.
Specializing in React/Supabase/AI, my last mission was to create a multi-country financial steering platform (CH/FR/BE/LU) with AI invoice extraction, bank reconciliation, e-invoicing, and Stripe. A complete product, designed and deployed alone.
I work on MVPs, internal tools, AI integrations, technical overhauls, and CTO consulting mandates.
I speak both the technical and business languages, which avoids endless back-and-forth.
Here are my areas of expertise:
- **Frontend**: React 18, Vite, React Router, custom hooks, contexts (auth, toast, company), modular components <200 lines, responsive, dark/light theme, CSS animations
- **Backend & DB**: Supabase (PostgreSQL, RLS, Storage, Auth), Vercel Edge Functions, complex JSONB queries, schema migrations, Row Level Security
- **AI & automation**: GPT-4o Vision (OCR invoice extraction), business prompt engineering, OpenAI Edge Function, document classification
- **Payments**: Stripe Checkout, full webhooks (all events), SaaS subscription management, 14-day free trial, upgrade/downgrade, full lifecycle
- **E-invoicing & compliance**: Factur-X XML CII (FR/LU), QR-bill CH, Peppol BE, DATEV DE/AT, FEC France 18 columns, CAMT.053, Belgian CODA, generic CSV, multi-VAT 6 countries
- **Internationalization**: react-i18next, full FR/DE migration (26 pages), browser language detection, bilingual dynamic FAQ
- **Transactional Emails**: Resend, 3-level automatic reminders, Stripe lifecycle notifications, quotes by email
- **SaaS Architecture**: Multi-tenants, multi-companies, plan limits (80%/100%), usage tracking, onboarding wizard, B2B2C fiduciary client portal
- **DevOps & deployment**: Vercel (prod + preview), environment variables, CI/CD, serverless Edge Functions
French
Native or bilingual
Remote only
Primarily works remotely
Experience
- Strate One AgencyFull-Stack Dev & Digital ConsultantDIGITAL AND ITJanuary 2021 - Today (5 years and 5 months)Full-Stack Dev & Digital Consultant · React · Supabase · AI · Multi-country SaaS · Fintech CH/FR/BE · Autonomous, prod-ready delivery · Jura CH · Remote · CHF from CHF (€) 95.-
- Connect41 SACEODIGITAL AND ITDecember 2023 - December 2025 (2 years)CEO of a startup specializing in the Internet of Things. Design and development of high-value tools using NFC in the wine & spirits, watchmaking, Horeca, and Medtech sectors.
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