Freelancer profile translated to English.
Back to original languageAbout Hadrien
Your app is running, but your tech is holding you back. Accumulated debt, degrading performance, each feature taking three times longer than before. You need a CTO, not just another developer.
I am a Fractional CTO. I specialize in custom tech rebuilds: I diagnose, restructure, and deliver a healthy foundation that will last for the next 3 years.
🎯 What I deliver:
- Comprehensive technical audit (architecture, code, infrastructure, debt)
- Rebuild plan prioritized by business impact
- Rebuild execution, either independently or by leading your team
- Knowledge transfer: documentation, CTO/lead recruitment, handover
đź’Ľ For whom:
- Founders whose Rails or Node app has become unmanageable
- Post-funding startups needing to scale without an in-house CTO
- Non-technical CEOs seeking senior-level diagnosis before hiring
- Companies integrating AI into their existing stack
🏗️ Why me:
I built, scaled, and sold my own e-commerce startup. When I look at your code, I see your P&L. Every technical decision I make is aimed at a business outcome, not technical perfection.
16 years of experience. Ruby on Rails, PostgreSQL, distributed architecture, generative AI.
đź“© Let's talk.
French
Native or bilingual
English
Native or bilingual
Danish
Conversational
Can work on-site
Paris (up to 50km), Toulouse (up to 50km), Lyon (up to 50km), Montpellier (up to 50km), Marseille (up to 50km)
Experience
- www.joone.frFractional CTOE-COMMERCEDecember 2019 - Today (6 years and 6 months)Copenhague, DenmarkTechnical leadership and development for an e-commerce scale-up (+€20M revenue)As a Fractional CTO for 7 years, I supported the company's growth with:Development & Architecture:- Maintenance and evolution of a complex Ruby on Rails application (recurring subscription management, custom Shopify Plus checkout, payment integrations)- Creation of multiple Shopify custom apps to support business operations- Leadership of the strategic migration from Rails to Node.jsLeadership & Organization:- Recruitment and management of the technical team- Code reviews and mentoring- Definition of the technical roadmap aligned with business objectivesImpact: Platform stabilization and scalability during a high-growth phase
- www.redonner.frFractional CTO - MVP and scaleFASHION AND COSMETICSSeptember 2018 - September 2025 (7 years)Copenhague, DenmarkCTO and creation of a donation platform for the circular economy (fashion)CTO role from MVP to company closure (profitable) in September 2025:Product & Development:- Creation of the MVP and support through all growth phases- Central Ruby on Rails application (donation management, partnerships, analytics)- Vanilla JavaScript widget deployed on hundreds of French fashion sites- Multi-channel experience: web, partner widgets, in-store QR codesLeadership:- Recruitment and management of the development team- Design overhauls and product evolution- Architecture of a complete and scalable technical solutionPost-closure:- Spin-off in partnership with the founder to serve the main client on a custom basisImpact: Leading tool for fashion donations in exchange for discounts, massive adoption by French retailers
- FaktusFractional CTO - Corporate Credit Fintech (MVP and scale)BANKING AND INSURANCESeptember 2023 - June 2024 (9 months)Paris, FranceFractional CTO - Corporate Credit Fintech (MVP and scale)Creation of the MVP and structuring of the tech team for a corporate lending fintech:Product Development:- Creation of the Ruby on Rails MVP from scratch- Integration of Swan (KYC and banking identification)- Integration with a third-party loan management system- Architecture of a compliant and scalable fintech platformTech Leadership:- Sole developer at launch, then scaling the team- Recruitment, onboarding, and management of 3 developers- Commitment of 3 days/week for 9 monthsTransition:Successful handover to a full-time CTO once the product was stabilized and the team was autonomousImpact:Rapid MVP deployment and structuring of a team capable of supporting growth
Reviews
Damien
Mooncard
Reviewed on 11/15/2019
Hadrien knows how to be both autonomous and ask the right questions, and understands the important points in the missions assigned to him.
AD
Account deleted
Reviewed on 10/5/2017
Hadrien did a quality job on our website, going deep into the details while delivering very clean code. Hadrien was available and responsive throughout the mission, while also proposing good solutions to the various problems we encountered along the way.
In short, we are very happy with the result and our collaboration. I would recommend Hadrien without any hesitation and with great pleasure!
Recommendations
+5
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Education
- Master In Business AdministrationESSEC2006
- FullStack WebDeveloperLeWagon2017Formation Full Stack Web Development https://www.lewagon.com/fr ● Back-end: Ruby, Ruby on Rails ● BDD: SQL (PostgreSQL) ● Front-end: HTML5, CSS3, Javacript (vanilla, Jquery, Ajax) ● Design: Sketch + Product management + Git, GitHub, + Heroku ... Le Wagon Paris est classé meilleur coding bootcamp au monde selon SwitchUp https://www.switchup.org/research/best-coding-bootcamps