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Dany GantierDG

Dany Gantier

Supermalter

🏅 Expert React.js | Next.js & React Native | Expo

€700/day
55 projects
Paris, FR
8-15 years

Average response time: 12 hours

Freelancer profile translated to English.
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About Dany

Senior Developer and Entrepreneur, I help startups and large companies transform complex challenges into performant, scalable, and user-centric applications.

Why CTOs and CEOs trust me (Top 1% Malt 2026):

🏆 Technical & Entrepreneurial Expertise:Co-founder of Sneakmart (app selected "Future 40" Station F), I understand business imperatives. I don't just "push code": I challenge features, prioritize added value, and guarantee optimal time-to-market.

⚙️ Seniority & Industrial Quality:I work on complex architectures (Fintech, Marketplace, Social, OTT/Streaming) with an absolute quality requirement.
  • Code: Clean Architecture, strict TypeScript, advanced Hooks.
  • Reliability: Tests (E2E/Unit), CI/CD, rigorous Code Reviews.
  • Methodology: Agile/SAFe, proactive communication, total autonomy.

🎨 UI/UX Sensitivity (The "Pixel Perfect"):My dual role allows me to communicate effectively with your designers and integrate complex interfaces (GSAP, Three.js, Fluid Animations) frictionlessly.

đź’» My Preferred Tech Stack:

🔹 Core (Advanced Expertise):
  • Front-End: React.js, Next.js (SSR/SSG), TypeScript
  • Mobile: React Native, Expo (iOS & Android)
  • State & Data: GraphQL, TanStack Query, Redux/Zustand
🔹 Ecosystem & Design:
  • Tailwind CSS, Styled Components, GSAP, Three.js
  • Supabase, Node.js basics
  • Figma (Prototyping & Hand-off)

âś… Ready to accelerate your roadmap? Whether for an ambitious MVP, a technical overhaul, or expert reinforcement in a squad, I integrate quickly to deliver value from day one.

Let's discuss your project! đź‘‹
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 50km)

Experience

  • Orange & Viaccess-Orca
    Senior Front-End Web/Mobile Developer
    TECH
    September 2021 - January 2025 (3 years and 4 months)
    Paris, France
    Senior Engineerin Front-End development inReact.JsandReact Nativefor white-label video streaming solutions. Cross-platform, iOS, Android, Web, Android TV, and Apple TV.

    Worked within aninternational team(France, Poland, Finland, Vietnam) of developers, over 20 developers, SAFe organization.

    For3 years**, I helped the teams at **Viaccess Orca and Orange**, providing my expertise on performance, optimization, and R&D challenges for their **high-impactapplications:millions of peopleuse the developed apps and services.
    React.js React Native TypeScript Mobile Application Next.js
  • Valuecometrics
    Senior Front-End Developer Next.JS and TypeScript
    CONSULTING AND AUDITS
    January 2023 - April 2023 (3 months)
    Paris, France
    Participation in Front-End development in Next.JS/TypeScript for a Fintech/ESG Scoring Dashboard platform.
    - Reworked Dashboard to Next.Js/TailwindCSS/MUI (SSR, NextAuth, API on Edge)
    - Integrated dashboard widgets via Metabase and Tableau
    - SSR Authentication via NextAuth and Keycloak
    - UX/UI/Responsiveness Audit and Improvement
    - Implemented code guidelines/styling
    - Code and performance optimization
    - Improvements to existing components
    - Implemented Clean Architecture (Generic, Hooks, etc.)
    Next.js TypeScript React.js Tailwind CSS NextAuth
  • Artur.ai
    Malt logoOn Malt
    Front-End Developer React.Js
    October 2020 - October 2020
    Participation in Front-End development in React.js/Next.js for Artur.ai, a Fintech platform aimed at simplifying individual investment.

    - UX/UI/Responsiveness Audit and Improvement
    - Implemented code guidelines/styling
    - Code and performance optimization
    - Improvements to existing components
    - Created components from scratch
    TypeScript React.js React Native Next.js Google Cloud

Reviews

5.0

Out of 19 ratings

AlexisA

Alexis

EKD CONNEXION

Reviewed on 10/16/2025

Dany is a very competent and professional individual. His advice was sound, both technically and in terms of application UX, which allowed us to develop a better version of it! I would gladly work with him again.
M

Mathieu

Valuecometrics

Reviewed on 3/2/2023

Dany worked with us on finalizing our MVP and reducing technical debt on our SaaS product. In addition to improving our code quality, he quickly delivered the requested features, made relevant suggestions for technologies to integrate into our product, and spent time training our junior developer internally. Dany knows how to meet tight deadlines to produce what's needed for our demos and meet our client commitments. We were very satisfied with the speed and quality of his work. His experience and suggestions make him a real driving force for the team, into which he immediately integrated. I recommend using his services to develop or accelerate early-stage projects, even ill-defined ones. He will know how to structure them and transform them into a final product ready to be tested on the market.

Recommendations

Mathis J.MJ
Martin SeigneuretMS
FU
Mathis J. and 2 other people have recommended Dany

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Education

  • Epitech Expert Title in Information Technology
    EPITECH
    2018
    « À l’issue de ce cursus en cinq ans, l’étudiant d’Epitech est un expert en informatique, autonome, responsable et parfaitement adaptable au monde de l’entreprise. Ultracompétent techniquement, il sait bien évidemment créer et combiner idées et technologies, mais également s’entourer des meilleurs partenaires pour diriger ses projets. Dans un monde en évolution permanente où l’innovation dicte les règles, il dispose ainsi des armes indispensables à sa réussite.» Emmanuel Carli, Directeur Général

Certifications

  • Self-Taught
    I continuously certify my skills and study new technologies by contributing to projects and the developer community
    SwiftUI React Native Next.js React.js
  • Digital Marketing Fundamentals Certification
    GOOGLE
    2017
    Google Analytics Lead Generation Google AdWords Google Cloud Google Search Console

Skill set

Categories