AI developer · PHP & Python · Saint-Mammès, near Paris

AI in your products, for real.

Agents, assistants, automations: I design AI and build it into applications, websites and teams. Fifteen years of production development behind me, an expert in PHP and Symfony, Python for AI, in Seine-et-Marne, in Paris or remotely.

Talk about your AI projectTest your site for free
  • 15 yearsof production development
  • 4 AI productsdesigned and online
  • Open sourcepublished Symfony bundles
  • Seine-et-Marnemeet in person or work remotely

My strong suit

AI, in practice

Not demos: systems running in production, which I designed end to end.

Autonomous agents

A multi-agent engine in Python: AIs that talk, decide and act on their own, with any OpenAI-compatible model.

Vivarion, then CrashMire

Test an agent before your customers do

Put an agent under pressure, replay hard scenarios, measure where it gives way: agent safety, measured.

CrashMire

Document analysis

Read, understand and check files and supporting documents with an LLM, and turn them into a clear decision.

Dokimo · DocVerify

Voice to data

Dictate in the field, let the AI transcribe, structure and fill in the spreadsheet for you.

Dictim

Connect assistants to your business

MCP servers, structured data, APIs for agents: ChatGPT or Claude can look up your offer and act.

LiaScan

Measure your visibility in AI answers

Ask several models every week and track who they cite, and why.

LiaScan

What I do for you

From the website that converts to the assistant that answers your customers, all the way to training your teams: one person, from the first line of code to going live.

AI integration

Assistants, agents and automations connected to your tools and your data: AI where it saves time.

Websites and applications

Business websites, line-of-business applications, redesigns: clean, fast and secure PHP/Symfony, built to last.

SEO and GEO

Be found on Google, and cited by ChatGPT, Gemini or Perplexity when your customers ask them.

Safe AI agents

Before you let an agent talk to your customers, we check how far it holds under pressure.

Training

Train your teams to use AI every day, or your developers in PHP, Symfony and agents: on site in Seine-et-Marne, or remotely.

Not sure what you need?

First test for free what AI assistants understand of your website. Two minutes, no sign-up.

For IT services firms, agencies and tech teams

Looking for a developer who can build AI in, and keep production running too? Here is what I do every day, on client missions as on my own products.

AI

  • LLMs: OpenAI, Anthropic, Mistral, open models through OpenRouter
  • Agents, multi-agent systems, tools, MCP servers
  • Document analysis, transcription (Whisper)
  • Agent evaluation and robustness testing

Development

  • Expert in PHP 8, Symfony 7, Doctrine
  • Python for AI: agent engines, scripts, data
  • REST APIs, asynchronous processing (Messenger)
  • Automated tests: PHPUnit, browser tests
  • JavaScript, and whatever a project calls for

Data

  • PostgreSQL, MySQL, Oracle
  • Database and schema migrations
  • Query optimisation
  • Tested backups and restores

Servers and network

  • Debian Linux, Docker, Docker Compose
  • Reverse proxy, automatic HTTPS
  • Firewall: only the ports that matter open
  • CPU, memory and disk monitoring, alerts

Automation

  • Automatic deployment of every release
  • Scheduled jobs: reminders, reports, checks
  • PHP/Symfony upgrades prepared and tested
  • Continuous integration (GitHub Actions)

Security

  • Attack detection and blocking (Sentinelle)
  • Rate limiting, SSRF protection
  • Secrets out of the code, hidden admin access
  • GDPR: minimal data, no needless cookies
Open to AI missions, in Python as in PHPTime and materials, fixed price or short-term reinforcement, directly or through an IT services firm. Write to me, I answer quickly.
Contact me

My projects

What I build when nobody asks me to: the best proof of what I can do for you.

Online

  • LiaScan

    Test for free what AI assistants understand of your website, and make it readable for them.

    liascan.fr ↗

  • CrashMire

    The crash test for AI agents: we put them under pressure and tell you where they give way.

    crashmire.com ↗

  • Vivarion

    An experiment to watch real AIs decide on their own, once they are given power.

    levivarion.fr ↗

  • Dokimo

    Rental application analysis for estate agencies, in a few minutes.

    dokimo.fr ↗

Open source

Symfony building blocks I use on all my sites, given to the community
  • Published

    Sentinelle

    Security bundle: spots attacks, blocks offending addresses and warns you by email.

    Code on GitHub ↗
  • Published

    Fineprint

    Legal notice, terms of sale, privacy and cookies, assembled from one configuration, in French and English.

    Package on Packagist ↗
  • Published

    Uplift

    PHP and Symfony upgrades prepared automatically, new features adopted, everything tested before it ships.

    Package on Packagist ↗
  • Published

    Rehearsal

    Try every update in your site's admin before it goes to production.

    Package on Packagist ↗
  • Published

    Echo

    Your site tells you at every key step: sign-up, payment, reminder, and a summary every morning.

    Package on Packagist ↗

Coming soon

  • ERP for consulting firms

    Missions, consultants, time spent and invoicing in one tool, designed for IT services firms.

    In progress

  • Donnha

    Get a tradesperson or a home-service pro in a few taps, the way you book a ride: a platform designed for Asian countries.

    Soon

  • Juridis

    Helping tenants get their security deposit back, step by step.

    On hold

Also kept me busy

  • Dictim voice dictation for property surveyors
  • DocVerify AI document verification API
  • PhotoCréation personalised photo products

Why work with me

Craft before fashion

Fifteen years of PHP in production, from large corporations to small businesses. AI builds on solid foundations, it does not replace them.

Products, not promises

My own tools run online: you see what I can do before you sign.

Close to you

Based in Saint-Mammès, between Fontainebleau and Montereau, south-east of Paris: we meet, or we work remotely.

The blog

What I learn while building, once a month. Articles are in French for now.

in French

Mon site se met à jour pendant que je dors, et je valide le matin

Uplift fait monter PHP, Symfony et les dépendances dans des limites que je fixe, lance les tests et me laisse décider. Premier vrai passage : Symfony 7.3 vers 7.4.21, 40 paquets.

 in French

Faire passer un crash-test à un agent IA

Un agent IA branché sur de vrais outils doit tenir quand on le pousse. CrashMire le met sous pression avec des données fictives, et dit ce qui a cédé et quels garde-fous ajouter.

 in French

Des pages légales qui refusent de se déployer quand il manque une obligation

Mentions légales, CGV, confidentialité, cookies : je les réécrivais à la main sur chaque site. Fineprint les assemble depuis une seule configuration, et bloque le déploiement en cas d'oubli.

All articles →

A project? Let's talk.

A website to build, search rankings to revive, AI to integrate: tell me what you need, I answer within 48 hours.

Saint-Mammès · Moret-Loing-et-Orvanne · Montereau · Fontainebleau · Nemours · Melun · Paris · remotely anywhere in France

Or by email: cdelage.dev@gmail.com

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