Josselin Dionisi

Hello,

I am a freelance web developer with several years of experience on demanding Symfony projects, complex API integrations, and AI-oriented architectures.

Founder of Plus Tard (plustard.com), a SaaS platform for social media post scheduling (LinkedIn, Instagram, TikTok, Facebook, X, Threads, Bluesky,...), I designed and maintained a complete full-stack application in production: Symfony backend, multi-platform OAuth integrations, Meta Pixel & CAPI, Stripe quota system, Docker infrastructure. This project is my best reference, not a client project, but a product I built and operate myself.

What I do for my clients:

🧑‍💻 PHP / Symfony Development

∙ Business web applications and SaaS platforms

∙ REST APIs & API Platform

∙ Clean architecture: DDD, services, repositories

∙ Testing, CI/CD, Docker

🤖 AI & Automation

∙ LLM integrations (Claude, OpenAI) and RAG pipelines

∙ n8n workflows (automation, AI agents, chatbots)

∙ Connecting your business tools with AI

🔗 Third-party Integrations & APIs

∙ OAuth, webhooks, social APIs (Meta, LinkedIn, TikTok…)

∙ Stripe, payments, subscriptions

∙ Cloudflare, nginx, VPS infrastructure

📱 React / React Native

∙ React web interfaces

∙ Turbo Native / React Native mobile applications

Why work with me?

I am autonomous, results-oriented, and I understand product challenges as well as technical ones. Having built and operated a SaaS myself, I know the cost of a bad architectural decision – and how to avoid it from the start.

Based in Grand Est (Metz), I work primarily remotely.