Custom Web Development Agency
We design websites and web applications that convert. Modern design, optimal performance, SEO integrated from the start.
Our Web Development Services
Showcase websites
Professional sites that reflect your brand and convert visitors. Custom design, responsive, SEO optimized.
E-commerce sites
High-performance online stores. Secure payment, stock management, logistics integration. Shopify, WooCommerce or custom.
Web applications
Custom business applications. Dashboards, client portals, internal tools. Modern technologies (React, Rails, Node.js).
Redesign and optimization
Modernize existing sites. Performance, design and SEO improvements. Migration to current technologies.
Why Choose JAIKIN for Your Web Development?
Design that converts
Our designers create interfaces that guide your visitors to action. Researched UX, not just beautiful.
Clean, maintainable code
Solid architecture, complete documentation. Your site will be easy to evolve, by us or another provider.
Native SEO
Every site is optimized for Google from design: HTML structure, performance, schema markup, automatic sitemap.
Full-stack approach
One team for design, front and back development, hosting and maintenance. No ping-pong between providers.
Our Work
Design Brilliance Studio
Portfolio site for a design studio. Smooth animations, interactive gallery, smart contact form.
HTML5, CSS3, JavaScript, GSAP animations
Voir le site →Kammerzel Showcase
Presentation of an exceptional property. Virtual tour, high-resolution gallery, appointment booking form.
HTML5, CSS3, JavaScript, responsive design
Voir le site →M&A Avocat Hub
Institutional site for law firm. Expertise presentation, team, news, online appointment booking.
HTML5, CSS3, JavaScript, SEO optimized
Voir le site →Case Studies: Concrete Results
B2B SaaS Startup
Challenge : Complete website redesign. Old site had 75% bounce rate and didn't convert.
Solution : New design centered on value proposition. Detailed feature pages. Clear CTAs. Highlighted customer testimonials.
Bounce rate reduced to 45%. Demo requests tripled. Average time on site from 45s to 2min30.
Fashion e-commerce (luxury niche)
Challenge : Basic Shopify store that didn't reflect the brand's high-end positioning.
Solution : Custom Shopify theme. Full-screen product photos. Simplified purchase journey. Instagram and lookbook integration.
Average cart increased by 35%. Conversion rate from 1.2% to 2.8%. Positive customer feedback on shopping experience.
Service SME (multi-site)
Challenge : 5 outdated WordPress sites to maintain. High maintenance costs. Fragile security.
Solution : Migration to single multi-language site with centralized management. Secure hosting. Automated maintenance.
Maintenance cost divided by 4. Loading time improved by 60%. 0 security incidents for 18 months.
Technologies We Master
Frontend
React, Next.js, Vue.js, Tailwind CSS, GSAP
Backend
Ruby on Rails, Node.js, Python
CMS
WordPress, Shopify, Strapi, Sanity
Hébergement
Heroku, Vercel, AWS, Cloudflare
Outils
Figma, Git, CI/CD, Automated testing
Our Development Process
Discovery
Understanding your objectives, audience and constraints. Competitor analysis. Scope definition.
Design
High-fidelity Figma mockups. Iterations until validation. Design system for consistency.
Development
Design integration. Feature development. Testing on all browsers and devices.
Optimization
Performance (Core Web Vitals). Technical SEO. Accessibility. Load testing.
Launch
Production deployment. Administration training. Documentation. Post-launch support.
Frequently Asked Questions
Professional showcase site: €3,000 - €8,000. E-commerce: €5,000 - €15,000. Custom web application: €10,000 - €50,000+. We provide a precise quote after analyzing your needs.
Showcase site: 4-6 weeks. E-commerce: 6-10 weeks. Web application: 8-16 weeks. These timelines include design, development and testing.
All our sites are responsive by default. We test on major devices (iOS, Android) and screen resolutions.
Yes. We offer managed hosting packages from €50/month including SSL certificate, daily backups, security updates and support.
Absolutely. We integrate a CMS (WordPress, Strapi or custom) that allows you to modify content without touching the code. Training included.