Your technology partner to structure, accelerate and secure your growth
CTO consulting, technical architecture, cybersecurity and product management for startups and enterprises
- 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 : audit, fractional technical direction, cybersecurity, AI, custom development and product support — no jargon, no reselling.
What speaks for us
10+ years
freelance CTO/CPO since 2015
50+
missions delivered
30+
clients: SMBs, scaleups, startups
4
frameworks: ANSSI, CIS, ISO 27001, NIST
2
publications: Notion template + AI workbook (paperback)
100%
independent, zero reselling
What tech topics do we take on?
Comprehensive support for your technology challenges — from Nantes, France, for engagements across Europe and beyond.
CTO / CPO as a Service
Outsourced technical or product leadership, part-time or full mission.
Technical Audit & Architecture
Assessment of existing systems, tech debt identification and recommendations.
Product Management
From idea to launch: scoping, specifications and development oversight.
Cybersecurity Consulting / CISO
Security policy, GDPR compliance, risk analysis.
Cybersecurity Posture Audit
Independent assessment, structured report and prioritized action plan for SMBs.
MVP Design & Launch
Scoping and development oversight for MVPs with controlled budget.
Technical Business Plan
Technical section of business plans: costs, timeline, technology choices.
Scalability & Performance
Performance audit, optimization and scaling strategy.
DevOps & Infrastructure
CI/CD pipelines, containerization, monitoring and best practices.
Technical Project Management
Complex project management: planning, coordination, reporting.
AI Consulting
AI strategy, use case identification and integration support.
Change Management
Supporting teams through technology and organizational transformations.
Digital Transition
Assessment, selection and deployment of IT tools tailored to your business.
Process Automation
Identifying and implementing automations to boost efficiency.
Turnkey 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.
CTO sweat equity partnership
Early-stage startup, no CTO budget? A senior CTO paid in equity, within a clean legal framework.
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 (Saint-Sébastien-sur-Loire), 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.