Less manual entry, fewer errors, teams focused on their actual work. AI agents, automations and custom applications, from scoping to production, in a matter of weeks. I do not build by default: I recommend the simplest solution that meets the need.
Software that follows your processes instead of constraining them: from the agent that answers your customers to the workflow running in production, up to the app that exposes it all. The same person covers the whole chain.
Business assistants, conversational agents, document processing. Connected to your tools and designed for a concrete outcome: fewer repetitive tasks, faster answers.
Your tools finally talking to each other: follow-ups, notifications, enrichment, integrations. Hours of data entry and copy-paste saved, every week.
Custom applications with built-in AI: user accounts, payments, dashboard, all deployed to production. Usable and measurable from the first version.
Turning your site into a source ChatGPT, Perplexity and AI search cite. A still-young acquisition channel, built early.
Three formats, three logics. Here is how they compare, depending on the size and pace of your project, so you can choose with full context.
Lots of structure: salespeople, project managers, designers, back-office. That structure shows up on the invoice and on the timeline.
you need several teams in parallel on a very large product.
Scoping, development, hosting and AI integration, carried by one person and shipped in weeks.
you want an MVP, an AI agent or an automation shipped fast, without structural overhead.
Often excellent, but specialized in a single brick: development, data or integration. You then have to assemble several and coordinate them.
you already have a team and need one very specific, one-off expertise.
Beyond price, the difference lies in who carries the project: here, the same person follows it from scoping to production.
Already know what you need? Go straight to it. Each service has its own page, with the method, the use cases and how to get started.
Custom AI agents that answer, qualify, summarize and process your documents, connected to your tools and deployed to production.
See the serviceAutomations that replace hours of data entry and copy-paste. Your tools finally talk to each other, reliably and under monitoring, in production.
See the serviceAI at the scale of an SME: an agent that takes repetitive tasks off your teams. Simple start, measurable result, gradual scale-up.
See the serviceA CRM that fits your team instead of the other way around: putting your current CRM back in order, integrations, or a fully custom build.
See the serviceThe software off-the-shelf tools do not cover: marketplace, client portal, back-office. A usable first version in production in 4 to 6 weeks, quoted per project.
See the serviceNot sure which service? Start with the Collaboration page for formats and method, or test your AI maturity.
Here is what applies to every project, whatever its size. Nothing more, nothing less.
A Git repository you own, admin access, clear documentation. Transferable to another team with no hidden dependencies, at any time.
Projects designed with your obligations in mind: data hosted in Europe when it requires it, AI processing scoped to limit exposure of sensitive information.
No hidden subcontracting: the person who scopes is the one who codes, deploys and maintains. You get a direct number, not a ticket.
After delivery, an optional monthly engagement for features, maintenance and support, quoted per project. The product does not stop at go-live.
A non-disclosure agreement can be signed before any detailed discussion about your product, data or strategy. Just ask.
Scoping, demos and documentation in French or English. Bloomberg Market Concepts certified, a finance and data grounding useful to business projects.
You talk directly to the person who designs and writes the code, no project manager, no subcontracting. Decisions take one conversation. For a very large product run by several teams in parallel, an agency remains the better fit, and I will say so.
A simple AI agent or a focused automation: one week. A full application with built-in AI: 4 to 6 weeks, quoted per project, with a usable first version in production then iterations after real-world use. The exact timeline is set at scoping.
Yes. Scoping, demos and documentation happen over video, in French or English, with code and documentation available online.
Yes. The format adapts: a focused automation or AI agent for an SME, a full MVP for a startup. In both cases, a first version reaches production quickly, then evolves through iterations.
I tell you at scoping. Sometimes an existing tool, properly configured, is enough; in that case I point you to it. Sometimes the right answer is to build nothing.
Describe your need in 30 seconds. I will tell you if I can do it, how long it takes and in which format, with no commitment.
Mathieu Haye is a freelance developer specialized in AI and automation, based in France. He designs and ships custom AI agents, automations and business applications, from scoping to production, in a matter of weeks. The same person scopes, develops, deploys and maintains: decisions are fast and nothing gets lost between the need and the delivery.
Time given back to your teams, fewer entry errors, information flowing without copy-paste. Two public examples: a custom CRM that replaced an off-the-shelf CRM that no longer fit, so the team now works in a tool that follows its processes instead of constraining them; and an AI newsletter produced automatically end to end, where each issue used to require manual work. The other services follow the same logic: custom AI agents, n8n automation, custom web apps & MVPs, AI agent for SMEs and AI visibility (GEO).
Based in the Paris region, I work on-site in the Ile-de-France area as well as remotely, internationally included. Scoping happens over video, code and documentation are available online, and exchanges fit into a short weekly check-in. Meetings can be held in English.
It all starts with a 30-minute scoping call over video, free and with no commitment. No written spec needed: you explain the outcome you are aiming for, in plain business terms, and you leave with a recommended format and a timeline estimate. If the project is not ready, or if an existing tool is enough, I say so. On the technical side: n8n for orchestration, Next.js and Supabase for applications, the leading AI model APIs for agents.
Ready to move forward? Book a call or describe your project to my AI agent. Test your AI maturity, check whether your site is visible to AI, or browse the journal on applied AI.