Portfolio
Yohann Dandeville
Real projects, in production or deployed — not demos.
About
Full-stack developer & entrepreneur
I'm Yohann, a full-stack developer based in France, founder of YdvSystems. I build complete business applications, SaaS platforms, games and AI-powered tools.
My approach: clean code, scalable architecture, zero over-engineering. I work solo, which means I'm fast, responsive and deliver exactly what's needed — no unnecessary meetings.
Learn more about my journeyTech stack
Front-end
Back-end
Databases
Artificial intelligence
DevOps & hosting
Cross-platform
Tools & integrations
Projects
Products & client projects
Suite of 4 SaaS applications (Insertion, Formation, Coaching, Manager). 14 core modules, multi-provider AI, 8,000+ automated tests, multi-site RBAC.
Turnkey showcase websites for craftspeople & shops: custom design, online booking, forms, hosted and maintained. 6 live industry demos.
Turnkey animated ad films: brief, script, animation, sound design and Full HD MP4 delivery in 5 days. First film delivered: the 48-second Plume teaser.
Plume — AI writing studio
A desktop application for fiction writers: editor, structured narratology engine and a dial-able AI co-pilot. V1.0 in its final stages (packaging and QA), internal pre-release.
Professional AI prompt generator — real-time scoring, 66+ templates, 4 platforms, lifetime license. Works with ChatGPT, Claude, Gemini and all major LLMs.
Personal blog for a person living with Parkinson's disease. 'Zero Stress' interface, AI voice transcription, WCAG AAA compliant, designed for difficult days.
Personal projects & R&D
Sophia — French voice assistant
A French voice assistant you speak to and that answers out loud, built in the open: the real code and the logbook of its construction, decision after decision, commit after commit.
Public GitHub repo — coming soon
AI maturity assessment tool for businesses. Adaptive questionnaire, personalized report, AI-powered recommendations.
Interactive narrative game — 40+ distinct visual environments, Web Audio API soundscapes. Playable with keyboard, gamepad and on mobile.
Browser-based 3D kart racing game with AI opponents, power-ups and dynamic tracks. Three.js, WebGL, real-time physics.
Have a project in mind?
Describe your needs and I'll get back to you within 24 hours with a concrete proposal.
Contact me