Jérémy S.
Areas of Expertise
Complete mastery
of the digital chain
From UX architecture to Lighthouse optimization, from semantic cocoon to internal linking — every skill is mastered in-house, without delegation.
Custom Website Creation
UX architecture, Figma prototyping, WordPress/Elementor Pro development, Core Web Vitals optimization. Lighthouse score above 90 on every delivery.
Strategic SEO
Structured semantic cocoon, Schema.org / JSON-LD markup, local and international SEO, comprehensive technical audit, targeted netlinking. Strategies designed to last.
Branding & visual identity
Logo creation, complete graphic charter, digital artistic direction, premium print media. Each identity functions coherently across all media.
Digital Marketing & Content
Strategic community management, SEO editorial content production, professional photography and video. Every action aligned with measurable growth objectives.
Advanced Technical Performance
Core Web Vitals optimization: LCP < 2.5s, CLS < 0.1, guaranteed Lighthouse score 90+. Asset compression, CDN, server cache, HTTPS, multilingual hreflang WPML.
E-commerce & Online Stores
Creation and optimization of WooCommerce and Shopify stores. Optimized conversion funnel, SEO product sheets, secure payment integration, stock management.
"A website is not an expense. It is a business asset that gains value over time — provided it is designed with impeccable technical architecture, semantically rich content, and a strategy built to last."
— Jérémy S., Founder JSEM Production · Andorra, since 2016
Journey
9 years of expertise
built project after project
An Andorran foundation, an international vision. The key stages that have structured Jérémy S.'s expertise.
Founding of JSEM Production in Andorra
Creation of the web agency in the Principality of Andorra with a founding conviction: demanding businesses deserve digital tools that match their ambitions. First clients in premium hospitality and catering on the French Riviera.
SEO Specialization & Portfolio Development
Advanced expertise in natural referencing — semantic cocoon, structured markup, technical optimization. Expansion into French, Spanish, and Monegasque markets. First WooCommerce and PrestaShop e-commerce projects.
International Expansion & Sectoral Diversification
Support for premium clients: audiologists, luxury yachting, renewable energies, wine estates. Development of multilingual sites (FR/EN/ES/CA). 100+ projects delivered.
Ultra-Premium Positioning & Affiliate Sites
Clear positioning in the international premium segment: Monaco, Dubai, London, Geneva. Launch of personal affiliate sites (jsemauto.com, jsemanimo.com). Advanced mastery of Core Web Vitals and Lighthouse 90+ optimization.
Semantic Cocoon Architecture & Geographical Domination
Development of advanced SEO architectures using semantic cocoons across 50+ geographical areas. Complete redesign of jsemproduction.com with international positioning. 300+ projects delivered, 400+ clients supported.
Tech Stack
Technical Skills
Tools mastered in production on delivered projects — not declarative skills.
Geographical Presence
Based in Andorra.
Present everywhere.
The Principality of Andorra offers a unique economic environment — fiscal neutrality, natural access to European markets, demanding international clientele.
Escaldes · La Massana
Ordino · Encamp
Saint-Tropez · Nice
Toulon · Paris
Ibiza · Marbella
Geneva · Zurich
Montreal · New York
Publications
Articles written
by Jérémy S.
Each article is written directly by Jérémy — no outsourced content, no ghostwriting. Real-time expertise.
Let's Work Together
Your project deserves
direct expertise.
A first strategic meeting — free, no obligation. Jérémy analyzes your situation and proposes a concrete approach within 24 hours.