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Yohann MartzolffYM

Yohann Martzolff

Fullstack Developer | CTO

€400/day
Perpignan, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Yohann

Does your web product need a technical profile capable of designing, developing, and evolving existing systems?
I step in to create, structure, and grow high-performing, maintainable web applications built to last.

**Full-stack developer, technical lead, and freelance CTO**, specializing in **JavaScript / TypeScript**, I assist startups, companies, and project owners across the entire web product value chain: **design, development, architecture, optimization, and evolution**.

I bring strong expertise in **Next.js, React.js, Node.js, and Supabase**, from launching an MVP to structuring a more mature product.

I work on **full-stack development, architecture, refactoring of existing products, technical leadership, and CTO-level topics**.

I also integrateAI toolsinto products and workflows when they bring real value: automation, AI assistants, content generation, and user experience improvement.

My goal: to design **high-performing, sustainable products aligned with your business objectives**.

Recent Projects

Side House -CTO and Senior Full-Stack Developer: steered product and technical strategy, architecture, and development of a suite of scalable web applications.
Traacks -Head of Engineering and Full-Stack Developer: steered engineering strategy, architecture, and development of a scalable multi-product SaaS platform in the motorsport industry.

Key Skills

✓ Full-stack development
✓ Scalable software architecture
✓ Technical leadership and CTO vision
✓ Refactoring and optimization of existing products
✓ Integration of AI tools and features

→ Find all my projects onmardi.work
→ Contact me todiscuss your project(response within 1 hour).
  • Spanish

    Basic

  • English

    Fluent

  • French

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • Side House
    CTO
    HOSPITALITY
    January 2026 - Today (5 months)
    Perpignan, France
    *Steeringtheproductandtechnicalstrategy for a **suite of web applications**, including **overseeing design**, **development**, and **deployment**.
    • Defining theoverall architecture**, **engineering standards**, and **delivery prioritiesacross multiple products and interfaces: public site, user journeys, internal tools, and business platforms.
    • Involvement in **functional scoping**, **technology choices**, **structuring development processes**, **platform reliability**, and **scaling up**.
    • Close collaboration with product, design, and business teams to align **vision**, **execution**, and **growth objectives**.
    Project Management Next.js Supabase CTO Claude Code
  • Side House
    Senior Full-Stack Developer
    HOSPITALITY
    November 2025 - January 2026 (2 months)
    Perpignan, France
    *Full-stack developmentof a product-oriented **suite of web applications**, involving the entire technical chain, from frontend to backend services.
    • Implementation ofend-to-end featuresacross multiple interfaces: public website, user journeys, transactional pages, shared components, and internal tools.
    • Primary stack: TypeScript, React, Next.js, Supabase/Postgres, with deployment and operation on Vercel, Webflow.
    • Involvement inapplication architecture**, **internationalization**, **user experience**, **data modeling**, **backend integrations**, **evolutionary maintenance**, and continuous **optimizationof **performance**, **quality**, and **scalability**.
    Next.js Development Vercel Supabase Webflow Claude Code
  • Traacks
    Head of Engineering
    SPORTS
    October 2025 - Today (8 months)
    Perpignan, France
    • Steering theengineering strategyfor amulti-product SaaS platformin the motorsport industry.
    • Defining thetechnical vision**, **structuring the architecture**, **managing the engineering team**, and implementing **delivery processestoaccelerate productionwhile ensuring the platform's **quality**, **scalability**, and **reliability**.
    *Supervising developmentacross multiple web products,coordinating with productand business teams,arbitrating technical priorities**, **continuously improvingcode standards, **performance**, and **deployments**.
    Team Management Project Management Next.js Supabase Claude Code

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Education

  • Web Developer
    O'clock
    2019

Skill set

Categories