A CTO / CPO who ships — web, mobile and AI apps for startups and SMEs.
Product scoping, PoC, MVP, technical rebuilds. I design, code, secure and ship with you. Fractional technical direction from Nantes, France-wide missions.
- Web + mobile apps
- AI integration
- 10+ yrs CTO / CPO
- Nantes · France-wide
- Who : Mag&Cie, a technology consulting firm based in Nantes, France. 10+ years of freelance technical leadership, engagements across France and beyond.
- Who for : startups, small businesses, SMEs, mid-caps and public institutions structuring, securing or modernizing their product and IT.
- How : fractional technical direction, web and mobile app development, AI integration, PoC and MVP shipped — no jargon, no reselling.
What speaks for us
10+ yrs
freelance CTO / CPO since 2015
50+
engagements delivered
10+
web and mobile apps in production
AI
Anthropic · OpenAI · Mistral integration
30+
SMB, scaleup and startup clients
100 %
independent, no reselling
What tech topics do we take on?
Comprehensive support for your technology challenges — from Nantes, France, for engagements across Europe and beyond.
Three turnkey offers that ship
Scoped, published pricing, committed timelines. No resale, no subcontracting.
Turnkey AI Agents
Autonomous conversational agent (receptionist, action agent). EU-hosted, trained on your data. 6-10 weeks.
DiscoverApplication PoC
Functional prototype in 2-6 weeks. Demo + code + go/no-go call. €2,500-10,000 excl. VAT (indicative, quote before we start).
DiscoverTurnkey SaaS launch
From idea to production. MVP + multi-tenant infra + billing + monitoring. €15,000-60,000 excl. VAT (indicative, quote before we start).
DiscoverTurnkey website — free build
Hosting, security, backups and editorial updates included every month. From €49/month excl. VAT.
Nos accompagnements
Deux missions complémentaires pour structurer votre activité et faire évoluer votre informatique.
Connect your business tools to AI — cleanly.
MCP (Model Context Protocol) is the open standard that lets Claude, ChatGPT, Cursor and other LLMs act on your systems — not just chat. We build the custom connector you need: secure, production-ready.
Fractional CTO / CPO
Senior technical and product leadership, on day rate or fixed-price. Framework written before day one, portfolio limited.
Why trust your tech to Mag&Cie?
What clients say
Clients say it better than we do
Raw feedback from recent engagements — a thermal & accessibility audit firm, a veterinary SaaS startup. Real testimonials, collected directly.
Antoine shares his expertise by helping us set up AI tools that improve our processes. He's extremely efficient and makes simple what looks very complicated, breaking it down clearly and going straight to the point. As auditors ourselves, we know how essential this phase is, and we saw it confirmed at the debrief. I'm looking forward to seeing Antoine's work on the AI tools to optimize our processes and standardize our deliverables, so they're always at the same quality bar.
Maxime Terrier
Responsable du bureau d'études · Ecosy Domeva
Thanks to MAG we got a complete and performant PoC in a very short time, which let us start prospecting and land our first clients. Conversations are simple and smooth, and MAG is highly responsive — even proactive — in addressing our needs. If you want a solid partner and solid deliverables, don't hesitate.
Anonymous testimonial
Directrice Générale
Frequently Asked Questions
CTO as a Service is an outsourced technical leadership engagement. It's designed for startups, SMBs and growing companies that need senior technology leadership without hiring a full-time CTO. Mag&Cie provides support from a few days per month to intensive engagement, depending on your needs.
Our technical audit follows four stages: scope definition, in-depth analysis (code, architecture, infrastructure, processes), findings presentation and recommendations, then delivery of a prioritized action plan with budget estimates. Duration varies from 1 to 3 weeks depending on complexity.
Every project is unique, so our pricing is tailored. The first 30-minute qualification meeting is free with no commitment. Following our discussion, we provide a detailed quote with scope, methodology and budget. We offer one-off engagements, recurring support or intensive missions.
We support companies of all sizes: early-stage and growing startups, SMBs and mid-market companies looking to structure their technology, as well as Fortune 500 enterprises undergoing digital transformation. Our clients span various industries: fintech, healthcare, e-commerce, manufacturing, services, SaaS.
Based in Nantes, we operate across France and Europe. Most of our engagements follow a hybrid model: on-site presence for key workshops and remote work for the rest. We work with clients in Paris, Lyon, Bordeaux, and throughout France.
An outsourced CTO is engaged long-term and takes operational responsibilities: managing teams, making architecture decisions, participating in executive meetings. A technical consultant intervenes on specific topics. At Mag&Cie, we offer both formats depending on your needs.
We provide comprehensive cybersecurity support: security audits, security policy implementation, GDPR compliance, risk analysis, business continuity plans, team awareness training. We act as an outsourced CISO to structure your security approach.
Yes, we support companies with their AI strategy: identifying high-impact use cases, feasibility assessment, model and tool selection (LLM, RAG, AI agents), prototyping (POC), deployment and team training. Our approach is pragmatic and ROI-focused.