Mathieu Haye, freelance developer specialised in AI and automation (custom CRM, AI agents, business applications)
Mathieu Haye helps SMEs and scale-ups remove the manual work that slows their growth: he designs and ships custom CRM platforms, AI agents, automations and business applications built around each client's processes, not a SaaS vendor's. His promise: building the software your company wishes it had found on the market. He does not build by default: he recommends the simplest solution that fits, and only custom-builds what truly deserves it. One point of contact from scoping to production, shipped in weeks. Four packages: a focused diagnostic at €490 excl. VAT (deducted from the project if you continue within 30 days), an automation sprint from €2,500 excl. VAT, a CRM or business application usually between €8,000 and €25,000 excl. VAT, and ongoing support priced on quote. The way in is a free 30-minute call. Based near Paris, working in French and English. Contact: contact@mathieuhaye.fr. Reply within 24h Monday to Friday.
I turn duplicate data entry, disconnected tools and highly specific processes into CRM platforms, automations and internal applications built around the way your organisation actually works.
One point of contact, from scoping to production.
I build the software your company wishes it had found on the market.
You need the tools already in place to finally follow how your teams actually work.
I start by checking whether your current system can be fixed or better connected. I only build custom when it genuinely creates more value.
3018 is the French national number against cyberbullying and online violence. No specification document could say what needed building: you had to see what happens when a report comes in, what the listener actually has in front of them, and what they are left to guess. I worked alongside their teams, then designed and built their custom CRM, Emma, from what I had seen.
Observe first, build second. That is exactly what I now offer as Immersion.
Most tools miss because they are designed from what gets said in meetings, not from what actually happens. I spend an agreed number of days on your premises, with your teams, watching the real work. What comes out of it is the tool that makes you money — not the one in the spec document.
What should we set up to answer our clients 24/7?
Smart assistants that answer your clients, qualify your leads and execute tasks 24/7. Connected to your tools, in production within weeks.
Learn more →The repetitive tasks disappear. Your teams don’t. Your tools finally talk to each other.
Learn more →Your team deserves a CRM it actually opens. Built around your sales process, not the other way around.
Learn more →When no software on the market fits your business, we build yours. In production within 4 to 6 weeks.
Learn more →A website that brings in clients and that AI engines can actually cite. Live within weeks.
Learn more →30 minutes, free, no strings attached. And if a simple solution is enough, I will tell you so.
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Perfect to get started, but as soon as your process leaves the template you stack subscriptions and duct tape. And nobody is accountable when it breaks.
Full teams, endless specs, back-and-forth through a project manager. The budget explodes before the first useful line of code.
A consultant who understands your business, recommends the simplest solution that fits, and custom-builds only what deserves it. Delivered in weeks, maintained continuously.
Four ways in, from a focused diagnostic to a system in production. Prices are excluding VAT; the final scope is framed together in a free 30-minute call.
Analysis of one process or tool: friction points, recommendations, target workflow and budget estimate.
One clearly defined process, connected, tested and documented. Two weeks of corrective warranty.
A first usable version, delivered in stages and improved from real day-to-day use.
Maintenance, monitoring, improvements and new workflows on a monthly roadmap.
They already trust me:
e-Enfance / 3018, esensia, Callkom, Concilium, Horus Condition Report.Four flagship projects. Click a card for details, or browse the full list.
Before, the 3018 counsellors juggled several tools. Today, one single workstation that prioritises urgent cases.
Fully automated weekly newsletter: 20+ sources, Claude scoring, Brevo delivery. Runs alone, zero humans.
Aggregates offers via API, scores them against my profile and generates an ATS CV + cover letter PDF for every good match.
Windows app that intercepts USB devices before the OS: BadUSB, O.MG, juice jacking blocked.
I am Mathieu Haye, an independent consultant and developer. I help teams whose way of working has outgrown their standard software build a system that is simpler, more reliable and genuinely fitted to their business. I scope, build, deploy and maintain the solutions myself.
Freelance briefs, business and AI conversations, partnership ideas, or a coffee to talk shop. Pick whichever channel suits you.
Book a callPrefer writing? contact@mathieuhaye.fr
