Custom Web Development Agency
Technologies & Partenaires
Who will build your project
No anonymous outsourcing: meet the people who will design, build and ship your solution.
Victor Gless-Krumhorn
Founder & Lead Developer
Prépa HEC, Paris-Dauphine (Finance & Wealth Management). Former UBS. Reserve NCO in the French Army. Full-Stack Developer specializing in Ruby on Rails — leads JAIKIN's technical strategy and product direction.
Patrick Eiermann
Co-founder & Senior Full-Stack Developer
Epitech graduate with 8+ years of software engineering experience, specialized in Node.js and DevOps. Designed an airline ERP system, e-commerce platforms, and production SaaS applications. Owns back-end architecture and systems integration.
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
Kappeler — sign manufacturer
Web overhaul for an Alsatian sign manufacturer (since 1962): SEO-prerendered site, integrated CRM, AI-powered sign configurator. +450% inbound leads, opened the German market.
Server-side rendering, CRM, AI configurator, 3D photogrammetry
Voir le cas →DT INTERIM — staffing group
Website for the DT INTERIM group (2 agencies): server-side rendering, synchronized job offers with JobPosting markup, embedded conversational agent — built for conversion and AI citability.
Server-side rendering, JobPosting schema, embedded AI agents
Voir le cas →Client portal — medical manufacturer
Multilingual client portal (6 spaces) for a diagnostic instruments manufacturer: document base, consumables tracking, EU data sovereignty. Anonymous client — sector confidentiality.
Multilingual web application, sovereign EU hosting
Voir le cas →Case Studies: Concrete Results
Flyvbird — airline
Challenge : Reservations, ticketing, fleet, accounting and compliance managed in separate tools.
Solution : Fully digitalized 360° back office, custom-built: the five functions unified in a single tool, connected to existing flows.
Back-office teams reallocated to commercial velocity.
Cambacérès — business law firm
Challenge : Time-consuming recurring legal deeds, and no way to hand them to a consumer AI tool: the data is covered by professional secrecy.
Solution : AI-assisted deed configurator with Zero Data Retention — deed templates owned by the firm, mandatory lawyer review on 100% of documents.
Faster drafting of standard clauses, professional secrecy guaranteed.
Nibler — construction group (multi-entity)
Challenge : Multi-site, multi-entity project management relying on scattered documents, hard to consolidate.
Solution : Digitalized site management: unified digital file, multi-site tracking, built-in compliance requirements.
Consolidated multi-entity management, single digital site file.
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.
They trust us
Projects delivered by our team — JAIKIN × Azinove Group
« Beyond the quality of the development itself, we valued their expertise on strategic AI and Data topics, with data sovereignty addressed from day one. What truly sets Jaikin apart is their commitment well beyond project delivery. We recommend Jaikin without hesitation. »
Ardo
SaaS — legal sector
« JAIKIN built our property management SaaS: units, accounting, budgets, maintenance and resident portal. »
Sovereign Estate
Real estate — management SaaS
« JAIKIN has been our technology delivery partner from the very first execution phase. »
Tomislav Lang
CEO & Co-founder, Flyvbird — aviation
Describe your project — quote within 24 hours
Personal reply from an expert, no commitment.
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: 1 week. 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.