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Johan CallensJC

Johan Callens

Designer & Next.js Developer

€350/day
Alès, FR
0-2 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Johan

Based in the Gard region, I primarily work remotely with clients across France.

I assist freelancers, VSEs, and small businesses in creating or improving their online presence: showcase websites, landing pages, redesigns, SEO optimization, content structure, and custom web interfaces.

I am someone discreet, calm, and very involved in the projects I undertake. I appreciate honest exchanges, simple relationships, and clear working methods. I prefer to move forward step by step, with good visibility on priorities, deadlines, and decisions to be made.

Before designing an interface, I like to understand the business, constraints, and working methods of the person or company I am assisting. A website is not just a series of nicely aligned blocks. It is often an important tool for making a business more readable, more credible, and easier to find.

Technically, I mainly work with JavaScript, both Vanilla and with modern frameworks. I favor sober, clean, and maintainable solutions over time.

I am also interested in everything surrounding the overall experience of a project: SEO, content structure, copywriting, storytelling, and visual identity. I enjoy creating functional interfaces, but also coherent, rhythmic ones that can convey something.

I work best with clear, realistic, and well-defined projects. I prefer to build something solid, useful, and lasting rather than promise a digital revolution before the real needs have even been defined.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Erudia
    Erudia: EdTech SaaS (product in production)
    DIGITAL AND IT
    March 2026 - Today (5 months)
    Nîmes, France
    Erudia is a personal product in production, designed and developed entirely independently. It is an educational platform focused on learning French and school fundamentals, designed for children and young learners.

    The project is based on two complementary experiences:

    - A multilingual landing page (FR/EN) developed in Vue.js, focused on product presentation and user acquisition.
    - An educational Progressive Web App (PWA) with a large-scale quiz and revision system.

    The English version of the application is specifically designed for non-French-speaking children to learn French as a Foreign Language (FLE), as well as elements of French culture and history.

    The French version, on the other hand, is aligned with the French school curriculum, with content structured according to school levels and expected skills.

    The system integrates an educational content base of over 20,000 questions, organized to promote repetition and progression.
    Technical responsibilities and achievements:
    Front-end development with Vue.js and PWA architecture
    UX/UI design adapted for children (simplicity, engagement, gamification, and mascot)
    Implementation of a scalable educational content structure (20,000+ items)
    Management of multilingualism and content adaptation according to pedagogical objectives (FLE vs. school curriculum and CEFR)
    Mobile-first optimization and application performance
    Full independent deployment and maintenance of the product
    Erudia is a flagship project in my freelance work, combining product development, educational UX, and the design of large-scale content systems.

    erudia.app
    app.erudia.app
    johanwebstudio.fr/realisations/erudia
    Supabase VueJS DevOps Next.js Project Management
  • JohanWebStudio
    Founder, Designer & Frontend Developer
    SOFTWARE PUBLISHING
    December 2025 - Today (8 months)
    Nîmes, France
    Design and development of custom websites and digital experiences for VSEs, artisans, and independent brands.
    Full project creation: art direction, UI/UX, JavaScript frontend and backend development (Vanilla, Next.js, Nest.js, TypeScript), interactive animations, technical SEO, content structure, and digital storytelling.

    Performance, accessibility, and user experience-oriented approach with particular attention to Core Web Vitals, responsive design, local SEO, and overall brand identity consistency.

    Deployment and optimization via Vercel, integration of modern tools, and agile working methodology to build fast, maintainable products designed to last.

    Portfolio, projects, and studio approach: johanwebstudio.fr
    DevOps Next.js JavaScript Project owner Project Management
  • Soficraft
    Frontend Designer & Developer (Freelance) - Soficraft
    DIGITAL AND IT
    January 2026 - March 2026 (2 months)
    Lyon, France
    Development of an immersive website for Soficraft, a brand specializing in the creation and sale of handmade fantasy jewelry, using Next.js.
    Integration of GSAP and Framer Motion for advanced animations and user experience-oriented product storytelling.
    UI/UX design, prototyping, and complete responsive integration. Implementation of fluid and dynamic interactions aimed at strengthening engagement and readability of the brand's universe.
    Optimization of front-end performance and navigation to ensure a consistent experience on desktop and mobile.
    UI Web Design Next.js Storytelling

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Education

  • Bachelor's degree +3 Professional Title CDA — Application Designer Developer
    Adrar
    2024
    Bac +3 Titre Pro CDA - Concepteur Développeur d'Applications
  • Associate's degree +2 Professional Title DWWM — Web and Mobile Web Developer
    Simplon
    2022
    Bac +2 Titre Pro DWWM - Développeur Web et Web Mobile

Skill set

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