Fractional CTO · Saas & ecommerce founders

I run your tech

Building MVPs, turning no-code into platforms, and staying around, years after launch.

8+ years

continued client relationships

350K+ people

used products I built

€100M+

revenue through my systems

Hadrien Matringe
Services

Three ways to work together, depending on where you are.

01
Starting at €5,000

Discovery & Roadmap

For founders who need clarity before building. I'll map your technical requirements, recommend architecture, and give you an honest budget estimate.

1-2 weeks
02
€20k - €60k

MVP Build or Scalable Rebuild

For founders with a validated idea or a product that's hit its limits. I'll build clean architecture that scales — not a prototype you'll need to throw away.

Scope-dependent
03
Monthly retainer

Ongoing Technical Partnership

For founders who need continuous development and strategic guidance. The CTO you can't afford full-time, without the overhead of managing an agency.

Architecture decisions & code reviews
Team hiring & management
Strategic technology planning
Work

Long-term relationships, not one-off projects.

Some clients have been with me for 7 or 8 years and counting.

01

Joone

7 years

2019 - present · E-commerce French baby care brand

Ongoing Technical Partnership

Built and maintained custom Shopify apps handling €20M+ annual revenue. Led V2 migration (Rails → Node/React/Next).
Still in strategic calls today.

Shopify React Node.js
02

Redonner

8 years

2018 - 2025 · B2B SaaS · Sustainable fashion

Full product lifecycle - MVP, Market Fit, Scale

MVP, growth, redesign, multiple pivots. Hired and lead employees and freelancers. Custom widget installed on 100+ Shopify shops.
Stayed until the end.

B2B SaaS Team Lead
03

Secret

2 years

2020 - 2022 · B2B SaaS · Business perks platform

MVP to full time CTO hire

Took over from burned-out dev, brought product to market fit. Now serves 210,000+ businesses.
Found and onboarded my own replacement, still current CTO.

B2B SaaS 200k+ customers
04

Faktus

8 months

2023 - 2024 · Fintech SaaS · French Construction financing

MVP to full time CTO hire

Built MVP, hired and lead dev team, reached first paying customers.
Handed off CTO role to the first dev team full time hire.

Fintech MVP
Testimonials

They trusted me.

Working alongside Hadrien means experiencing excellence. He sees details without losing sight of the bigger picture, anticipates challenges, proposes clear solutions, and rallies talent around a common goal. I particularly admired his ability to maintain high standards, even under pressure or uncertainty. He combines rigor with kindness, making him not only a leader but an inspiring mentor. His intellectual curiosity, sense of innovation, and adaptability make him highly relevant in a changing environment. If you're looking for someone who exceeds expectations and delivers results: look no further than Hadrien.

Carole Juge-Llewellyn Founder @Joone

We chose Hadrien to build the MVP of redonner.fr in 2018. We were reassured that he graduated from ESSEC and especially that he taught at Le Wagon. He convinced us with his understanding of business challenges and clear communication. Hadrien supported the project's growth, recruiting and managing dev teams as needed: often remaining the sole developer. He built the Redonner widget, integrated into 100+ partner stores, which played a key role in achieving product-market fit. After 7 years of working together in complete trust, we now collaborate as partners.

Valentine Silvin Collon CEO & Co-founder @Redonner

Hadrien is a cornerstone of Redonner's success. We entrusted him with full confidence to lead the technical development of our solution. Beyond the purely technical aspects and the many challenges he helped us navigate, Hadrien actively contributes to our product's evolution through his optimization proposals and constant focus on improving UX and UI for our clients and users. The perfect CTO-as-a-Service profile!

Alexis Colon Founder @Redonner

We brought in Hadrien for complex Ruby on Rails projects. He took ownership of numerous topics with great autonomy and, thanks to his development rigor, critical thinking, and challenging mindset, successfully delivered them all. I highly recommend his work, his commitment, his professionalism, and his excellent communication skills.

Olivier Levine CTO @Joone

Enthusiastic, creative and professional. While being flexible and open-minded, Hadrien is a good decision maker and project manager.

Emmanuel Levy Founder @Hifi.fr

Right after our MVP launched in April 2020, our CTO burnt out. I found Hadrien and within weeks we saved momentum and resumed shipping. He was our only dev for months, then helped hire and manage the dev team. He helped Secret find product-market fit by building core features: subscriptions with Stripe, dynamic coupon logic, and our white-label offer. What I liked was his dual background: he quickly understood business needs, so communication was always smooth. Once we could hire a full-time CTO, Hadrien introduced me to Frédéric, still CTO with us today. I highly recommend Hadrien and would gladly work with him again.

Edouard Rosenblum Founder @Secret

I worked alongside Hadrien for over a year on various Ruby on Rails projects, fullstack and API. An extremely serious, diligent, and skilled developer, he was a constantly renewed source of knowledge and a key element in the success of the solutions we developed. His rigor and expertise are an asset for anyone looking for an autonomous and productive developer.

Guillaume Enfroy Staff Software Engineer @JobTeaser

Hadrien has been working on our internal apps for several years now. He brought a lot of rigor to the projects and delivers quality, functional, and useful code. The exchanges and scoping phases with him ensure we don't invest unnecessarily in features that aren't useful: Hadrien is fully engaged in these discussions with us.

Mathieu Barascou Founder @Hyffen

I worked several weeks with Hadrien on different projects (Ruby on Rails, JS) and can only recommend him. Hadrien is a serious, highly competent, and very well-organized developer. Working with him is a pleasure: he puts his talent, skills, and knowledge at the service of the team. A real asset without a doubt! I hope to collaborate with him again soon.

Frédéric Laffont CTO @Secret

I had the chance to work with Hadrien for a few months. Hadrien has a taste for well-done, quality work, and is serious, reliable, and always available. I learned a lot from him, both technically and in how to organize work. It was a very enriching experience that I would happily repeat.

Paul Portier Full Stack Developer @Freelance
About

I treat your tech investment like it's my own company.

Serial entrepreneur

Built and sold an e-commerce business. I understand your side of the table: the pressure, the trade-offs, the decisions.

Business-first

Every decision is about ROI, not cool tech. I won't recommend a microservices architecture when a monolith will get you to market faster.

Hands-on partner

In the trenches: coding, reviewing PRs, managing teams. Not just advising from afar.

Long-term mindset

I don't disappear after launch. Some clients have been with me for 8 years because they know I'll be there when things break.

Contact

Let's talk about your project.

Whether you need a discovery session, an MVP build, or a long-term technical partner: let's start with a conversation.

Book a Discovery Call

What to expect

  • 1

    30-minute intro call

    Tell me about your situation. I'll be honest about whether I can help.

  • 2

    Clear proposal

    If there's a fit, you'll get a scope, timeline, and fixed price within a week.

  • 3

    We begin

    Discovery projects typically start within 2 weeks of agreement.