Method & offers

Three ways to work together.

Three formats, from one pain point fixed in a week to a complete application. And sometimes the right answer is to build nothing: the 30-minute scoping call is there first to decide whether the project deserves to exist.

1-week Sprint

from €2,500

One precise pain point, solved in a week: an automation, a simple AI assistant, an integration with your CRM. Scoped in 30 minutes, delivered in 5 days.

  • Scoping call over video
  • Delivery in 5 business days
  • Code, documentation and handover
  • 2 weeks post-delivery support
Best for

unblocking a CRM pain point, adding a one-off business assistant, automating a manual follow-up.

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Most requested

MVP 4 to 6 weeks

On quote

A complete web application: user accounts, online payments, an AI assistant if needed. Deployed to production, ready to be used and measured.

  • User accounts, dashboard, payments
  • Built-in AI assistant and automations
  • Production deployment and follow-up
  • Documentation and handover
Best for

marketplaces, vertical B2B software, community platforms, custom back-offices.

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Monthly support

On quote

A regular presence on an existing product: improvements, maintenance, support. We plan at the start of the month, I deliver.

  • 4 to 8 days per month, as agreed
  • Product improvements and fixes
  • Shared workspace (Slack or Notion)
  • 20-minute weekly check-in
Best for

startups without a technical lead, teams who want a development partner, products that need to evolve fast.

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These amounts are orders of magnitude. The final quote depends on scope: we frame it together in 30 minutes.

How I decide

First decide, then build.

Scoping ends in one of three outcomes: build, plug in an existing tool, or do nothing for now. I recommend the simplest solution that meets the need.

01

A useful product first

We slice the scope. A first usable version in weeks, in your hands. We iterate after real-world use, not before.

02

Fast, never sloppy

Judgement, review and testing stay human: nothing reaches production without validation.

03

Your tools finally talk to each other

Reminders, notifications, invoicing, syncing between your software: repetitive tasks run on their own, in a readable, editable way.

04

No middleman

I scope, I code, I deploy, I maintain. You have my phone number. No project manager filtering your requests.

FAQ

Questions I get often.

What if I don’t know exactly what I need?

That is the most common situation. You do not need a written spec: just describe the outcome you are aiming for, in plain business terms. The 30-minute scoping call turns a fuzzy idea into a clear perimeter, and you leave with a clear recommendation, with no commitment. If the project is not ready, I say so and point you in the right direction.

Why not an agency?

An agency bills 3 to 5 times more for the same deliverable, because it has to fund salespeople, project managers and back-office. Here, you have a single point of contact: the person who scopes, codes and delivers. Decisions move faster. For a product that needs more than ten developers in parallel, an agency remains the right choice; for an MVP, an internal tool or an automation, it is not.

How do you guarantee code quality?

I rely on modern tools to write and document faster. I review, test and validate every delivery before it goes to production. You receive readable, documented code.

What tools do you work with?

Proven building blocks: Next.js, Supabase and Stripe for applications, n8n for automations, AI agents on the OpenAI or Claude APIs, and Claude Code as a development assistant.

Who owns the code, and where is the data hosted?

The code is yours: a Git repository in your name, admin access, clear documentation. Your data can be hosted in France, with GDPR compliance built in from the start. Everything is transferable to another team, at any time.

What if I already have a tech team?

Then I step in as targeted reinforcement (AI integration, CRM rebuild, automation), alongside your team. Collaboration runs through a shared workspace and a short weekly check-in.

Do we need to sign a contract before starting?

Yes. Every engagement starts with a written quote and, if you want, a signed non-disclosure agreement before any detailed discussion about your product. Nothing begins on a verbal handshake alone.

Do you work remotely and in English?

Yes. I am based in Paris and work remotely with clients across France and internationally. Exchanges happen over video, and English calls are fine from scoping through to demos.

Talk now?

Describe your project in 30 seconds. I will tell you whether I can do it, and how long it takes, within 24 hours.

Book a call Chat with my AI agent Direct email

Mathieu Haye, a freelance developer specialised in AI and automation based in Paris, designs custom web applications, AI agents and automations that save SMEs time. Four formats: a focused diagnostic at €490, an automation sprint from €2,500, a CRM or business app usually between €8,000 and €25,000, and ongoing support on quote. Every engagement starts with a 30-minute scoping call over video, which is first about deciding whether the project deserves to be built; a written quote follows. You then talk directly to the person who scopes, codes and delivers.

You now know how the work runs. To go further, describe your project to my AI agent, test whether your site is visible to AI, assess your AI maturity, or browse the journal on applied AI and building.

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