Freelancer profile translated to English.

Description

A web project, an AI integration, a custom tool — I build, I deliver, I adapt.

I am Yohann, a fullstack developer based in France, founder of YdvSystems. I design complete business software, SaaS, AI integrations, and interactive experiences.

— from brief to production —

Ten years leading a cultural organization before specializing in development — I approach a project by understanding the business stakes, not just the technical specs.

Clean code, scalable architecture, zero over-engineering. Responsive, focused on the essentials, no unnecessary meetings.

Comfortable with very different projects: multi-tenant SaaS platforms, multi-provider AI integrations, cross-platform desktop software, 3D browser games.

What motivates me: solving a real problem for a real need — not just delivering code for the sake of it.

Industry field of expertise

Languages

French
Native or bilingual
English
Conversational

Workplace preferences

Remote only

Primarily works remotely

YdvSytems
Developer — B2B SaaS Platform for Employment and Training Sectors
PUBLIC SECTOR
December 2024 - Today (1 year and 6 months)
Narbonne, France
B2B SaaS Platform
: **4 business solutions (IAE employment, Qualiopi training, coaching, CRM)**, strict multi-tenant architecture, granular RBAC, multi-provider AI, real-time, Stripe payments.

**8000+ automated tests**, ~99,000 lines of code.

**Commercial launch scheduled for June 2026**.

Next.js Typescript Automation & Artificial Intelligence tRPC Prisma
YdvSystems
Developer — Prompt Engineering PWA & Android Application
SOFTWARE PUBLISHING
October 2025 - December 2025 (2 months)
Narbonne, France
**Professional AI Prompt Generator**: real-time expert scoring (TF-IDF, coherence analysis, intent detection), **66+ business templates, 8 languages**. Available as PWA, Desktop, and native Android — **100+ downloads on the Play Store**. Offline RSA-2048 licensing system.

React.js Typescript Capacitor PWA Cryptography
YdvSystems
Developer — Cross-Platform Interactive Narrative Game
CULTURE
February 2023 - June 2024 (1 year and 4 months)
Toulouse, France
**Solo Narrative Role-Playing Game (Online)**: 621 paragraphs, **45 locations with video and sound ambiance**, 59 enemies. **2 playable characters**. Deployed on Web, Desktop (Tauri), and Mobile (Capacitor) from a single codebase. ~30,000 lines, zero external UI dependencies, **3D WebGL dice**, procedural audio via Web Audio API. **Careful artistic direction on mobile**.

React.js Typescript Vite.js Tauri Capacitor