Sorting and answering inbound e-mail
Every message read, classified, routed: simple requests handled directly.
Merlin designs and deploys AI agents and automations inside the tools you already use. Process audit, production within weeks, long-term support. Public pricing, your data stays with you.
A new agency? Not really.
Merlin is the AI studio of Fullstack, a digital agency in Paris since 2015.
We were not born with ChatGPT: we have been building the web for more than 15 years, and we now put AI agents into production. We are developers.
This technical depth considerably widens the range of solutions we can bring to our clients: the speed of no-code SaaS when it is the right answer. But also the power of custom development, where tool assembly reaches its limits.
We analyse your business flows, reconnect your tools and deploy coherent systems, to raise the productivity of your teams and the profitability of your operations.
of French SMB and mid-market executives consider AI vital to their survival within 3 to 5 years
only have a defined AI strategy
Where to start, what to automate first, how to move fast without spreading thin? That is exactly where we come in: guidance to identify the most relevant use cases, custom tools built for your teams, and upskilling your people as the deployment unfolds.
Source: Bpifrance Le Lab, "AI in French SMBs and mid-caps", 2025. 1,209 executives surveyed.
What makes us different
Your agents and automations settle into your CRM, your ERP, your e-mail, Slack or Notion. No migration, no new tool for your teams to adopt
Our price ranges are public, line by line, further down this page. You know whether it fits your budget before you even call us
Self-hosted automations (n8n self-hosted) when relevant, European models when possible, GDPR and the AI Act built in from day one
From automation platforms to LLM models to code: we pick the building block that fits your context, not the one that suits us.
n8n
Make
Zapier
Power Automate
OpenAI
Claude
Mistral AI
Gemini
DeepSeek
Llama
LangChain
Hugging Face
HubSpot
Notion
Slack
Google Workspace
Python
TypeScript
Node.js
PostgreSQL
Supabase
MongoDB
Docker
AWS
Vercel
GitHubThis list is nowhere near exhaustive: wherever your teams read, sort, re-type or wait for information, there is a gain to capture. That is precisely what the audit is for: spotting the ones worth it in your business.
Every message read, classified, routed: simple requests handled directly.
Every form scored, enriched and followed up without delay.
Generated from your prices and product data, ready to proofread.
Common questions handled, the rest routed to the right person.
A sourced answer, drawn from your procedures and contracts.
Invoices, purchase orders, contracts: the data enters itself.
Reminders sent on time, no more invoices left sleeping.
Entries reconciled, discrepancies flagged before closing.
The weekly report prepared and distributed: sales, ops or finance.
Transcript, decisions, actions assigned in your tools.
CVs read, profiles matched to the role, personalised replies.
Reviews and tickets sorted by theme, pain points surfaced in plain words.
Sources tracked, the essentials summarised in Slack or by e-mail.
Your procedures searchable in natural language by your teams.
Product sheets and articles written in your tone, ready to proofread.
Calls answered, intent identified, message passed on or meeting booked.
No six-month tunnel, no platform to adopt. Four steps, a concrete deliverable each time, and an exit door after the audit.
We immerse ourselves in your tools, interview your teams, map the repetitive tasks. We only keep the cases that truly save time.
You leave withA prioritised automation plan, costed in recoverable time. It is yours, whether you continue with us or not.
We build the most profitable case directly in your environment: CRM, e-mail, spreadsheets. A demo every week, adjustments live.
You leave withA working agent, tested on your real data. Nothing goes to production without your green light.
Guardrails, permissions, GDPR compliance. We train your teams so they can drive the agent without us.
You leave withAn agent in production, documented, that you own 100%.
We track real usage, adjust, and identify the next cases. A project is finished when your teams use it every day.
You leave withA monthly review: time recovered, adjustments, next automations.
Self-hosted or EU — your choice.
Processing register, data minimisation, DPA.
We qualify the risk level of every use case before deploying.
Custom work has no catalogue price. But you deserve an order of magnitude before booking a call. Here are our real ranges, and what makes the price vary.
Process mapping, data audit, costed use cases, deployment roadmap.
Agents that handle your e-mail, qualify your leads, prepare your quotes — under human supervision.
Conversational assistants for your teams or your customers, document retrieval (RAG), voice variant possible.
Your processes connected end to end (n8n, Make), documents included: invoices, reminders, reporting.
Business tools and applications augmented with generative AI, when automation is no longer enough.
AI literacy for executives and teams, hands-on onboarding of the deployed tools.
| 30-min diagnostic | Free |
|---|---|
| Process audit | from €1,500 |
| First automation | €1,500 - €8,000 |
| Custom AI agent | €4,000 - €20,000 |
| Chatbot / AI assistant (RAG) | €4,000 - €20,000 |
| Custom AI application | from €15,000 |
| AI training (on-site) | €1,000 / day |
| Production support | from €300 / month |
Indicative ranges: every project is quoted after the audit. What makes the price vary: the number of connected tools, the volume, how critical the process is, the hosting.
Fixed quote after the audit: no time-and-materials billing, no surprises.
No commitment.
Merlin was born at Fullstack, a Paris digital agency: design, iOS/Android apps, web platforms for Disneyland Paris, EDF or Sanofi since 2015. When AI agents arrived, we did what we always do with a new technology: we put it into production. Our agents run today for Acuity, Voilà or BindeX. Merlin is that experience, applied to your processes.
Real photos of the team, no AI avatars. More about the parent agency: fstck.co.
A custom AI agent costs between €4,000 and €20,000 depending on scope. A first automation runs between €1,500 and €8,000, and a chatbot with document retrieval (RAG) between €4,000 and €20,000. All our ranges are published in the Pricing section of this page; every project is quoted as a fixed price after the audit.
An AI agency designs and deploys artificial-intelligence solutions for businesses: agents, automations, assistants. Merlin, concretely, installs AI agents and automations inside the tools you already use (CRM, ERP, e-mail, Slack, Notion), then supervises them in production.
An AI agent is software that performs tasks with supervised autonomy inside your tools: reading an e-mail, qualifying a request, preparing a reply or a quote. Example: an agent that sorts inbound e-mail, answers the simple requests and hands the rest to the right person.
A first automation typically ships in a few weeks. A custom AI agent or a chatbot takes four to eight weeks depending on the tools to connect. The initial audit itself takes one to two weeks.
No. AI takes over the repetitive tasks (sorting, data entry, reminders) and your teams keep the decisions. Every agent we deploy runs under human supervision: it prepares, you approve.
It depends on architecture choices — and you make them. We can host your automations on your servers (n8n self-hosted) and use European or open-weight models whenever possible. Nothing leaves without your decision.
No — that is the whole point of the agency: we plug AI into what you already have. Your agents and automations settle into your CRM, your ERP, your e-mail, Slack or Notion. No migration, no new tool to roll out.
The team behind Fullstack, a Paris digital agency active since 2015 (fstck.co). Merlin is its studio dedicated to AI agents and automation.
Yes — they are our core focus, with the free 30-minute diagnostic as the entry point: you leave with 2-3 costed use cases for your business, whether you work with us or not.