Freelancer profile translated to English.

Description

Freelance Front-End Developer, I help startups, agencies, freelancers, and associations bring their ideas to life with custom, high-performing, and reliable web interfaces.

💡 Specializing in React, Next.js, and Tailwind CSS, I work on projects from scratch as well as strengthening existing teams. I pay particular attention to user experience, code maintainability, and interface performance.

🧰 Key Skills:

- React / Next.js interface development

- Creation of showcase, institutional, or e-commerce websites (static or dynamic)

- Custom integration (responsive UI, SEO, accessibility)

- Chrome extension development (Manifest V3)

- Technical support and product consulting

🔧 Recent Projects:

- Ulule & Bien ou Bien – Front-end development of the ethical marketplace

- Atelier Délices – E-commerce website for an artisan (from scratch)

- Kontigo – Showcase website for sporting events

- Dr. Jean Delpierre – Showcase and SEO website for an aesthetic surgery practice

- Association Promotion Montessori – Complete development of the association website

- Vinted Extension – In progress: automated reposting tool for online wardrobes

🌍 Smooth international communication

In addition to my mastery of development tools, I am trilingual – French, English, and Spanish 🇫🇷 / 🇬🇧 / 🇪🇸

This linguistic skill allows me to collaborate effectively with multicultural teams and on international projects.

🚀 I am responsive, organized, autonomous, and I like to invest myself in meaningful projects. Let's talk about your needs!

Industry field of expertise

Languages

French
Native or bilingual
English
Native or bilingual
Spanish
Native or bilingual

Workplace preferences

Remote only

Primarily works remotely

Mathieu Derval
🧑‍💻 Freelance Front-End Developer (React / Next.js)
CONSULTING AND AUDITS
January 2020 - Today (6 years and 7 months)
Nantes, France
Since 2020, I have been assisting companies, startups, and associations in creating modern, fast, and well-designed web interfaces.

My core expertise:
👉 React, Next.js, Tailwind CSS, Chrome extension development, custom website and web platform creation.

I can be involved in:
- Projects from scratch
- Redesigns or UX/UI improvements
- Responsive web integration, SEO optimization, front-end performance
- Or as technical support within an existing team

I am rigorous, autonomous, and attentive.
💬 Open to any collaboration: one-off project, long-term mission, or technical support.
Let’s build something great together!
React.js JavaScript Next.js Contentful Typescript
AdSecure
Product Manager
TECH
October 2016 - May 2020 (3 years and 7 months)
Région de Barcelone, Espagne
At Adsecure, I led the design and launch from scratch of an advertising cybersecurity SaaS solution, used by ad networks, SSPs, and publishers worldwide.

🎯 Objective: To enable advertising platforms to detect, analyze, and block malicious or non-compliant ads in real-time.

✅ My responsibilities:
- Complete product scoping: vision, roadmap, prioritization, MVP
- Writing functional specifications and close collaboration with developers (front/back)
- Implementing and facilitating agile methodology (Scrum)
- Cross-team coordination (tech, sales, support) and user feedback management
- Monitoring product KPIs and adjusting strategy with each iteration
- Conducting QA tests, product documentation, and launch support

💡 Result:
- Successful launch of a high-performing and scalable B2B webapp
- Adoption by major players in programmatic advertising
- Recognition as a reliable "malvertising detection" solution
Product Management Product Manager Advertising Cybersecurity
Exoclick
Project Manager
TECH
October 2014 - October 2016 (2 years)
Région de Barcelone, Espagne
I orchestrated the complete creation of a viral media platform composed of several high-traffic websites, designed to maximize ad arbitrage.

🎯 Key Responsibilities:
- Product design & strategic management: defining the roadmap, business objectives, and deliverables
- Tech team management (agile methodology): supervising a team of engineers, managing sprints, QA, and testing
- Technical infrastructure supervision: performance, availability, website scalability
- Monetization management:
> Media buying
> Negotiating partnerships with advertising platforms
> Performance analysis (reporting, A/B tests, benchmarks)

📈 Results:
Implementation of a profitable ecosystem based on traffic and conversion optimization

High autonomy on topics combining product, tech, marketing performance, and monetization
Project Management Project Management