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Founded by passionate advocates of learning and innovation, Learni set out to make professional training accessible to everyone, everywhere in the world. Our team works in the largest cities such as Paris, Lyon, Marseille, and internationally, to support talents and organizations in their skills development.
10 spots per session maximum — 10 already taken
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30 free minutes with a training advisor — no commitment.
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Don't let this gap widen
Without Mobile First mastery, 53% of mobile users abandon sites loading over 3 seconds, slashing potential revenue by 40% on average for e-commerce platforms.
Front-end teams ignoring high-performance mobile optimization face 70% bounce rates, costing businesses $500,000+ annually in lost conversions and SEO rankings.
Project managers risk stalled deliverables, client churn, and career setbacks as competitors dominate the 60% mobile-driven web traffic.
Delaying these skills means mounting vulnerabilities in a mobile-first world—act before your edge erodes completely.
The Training Mobile First - Optimizing High-Performance Mobile Websites training is delivered in-person or remotely (blended-learning, e-learning, virtual classroom, remote in-person). At Learni, a Qualiopi-certified training organization, each program is designed to maximize skills acquisition, regardless of the training mode chosen.
The trainer alternates between demonstrative, interrogative, and active methods (through practical exercises and/or real-world scenarios). This pedagogical approach ensures concrete and directly applicable learning in the workplace.
To ensure the quality of the Training Mobile First - Optimizing High-Performance Mobile Websites training, Learni provides the following teaching resources:
For in-house training at a location external to Learni, the client ensures and commits to having all necessary teaching materials (IT equipment, internet connection...) for the proper conduct of the training action in accordance with the prerequisites indicated in the communicated training program.
The assessment of skills acquired during the Training Mobile First - Optimizing High-Performance Mobile Websites training is carried out through:
Learni is committed to the accessibility of its professional training programs. All our training programs are accessible to people with disabilities. Our teams are available to adapt teaching methods to your specific needs. Do not hesitate to contact us for any accommodation request.
Learni training programs are available for inter-company and intra-company settings, both in-person and remote. Registration is possible up to 48 business hours before the start of training. Our programs are eligible for OPCO, Pôle emploi, and FNE-Formation funding. Contact us to discuss your training project and funding possibilities.
Analysis of expert mobile constraints. Audit of existing sites. Mobile First strategies for businesses. Setting up a professional workflow. Exercises on concrete mobile app cases. Creation of the responsive red thread project. Advanced mobile debugging tools. Hands-on practice with real emulators. Focus on initial performance.
Priority Mobile First CSS rules. Mastery of Flexbox for mobile layouts. Advanced CSS Grid for expert complexity. Professional conditional media queries. Practical exercises on desktop-to-mobile refactoring. Red thread project: optimized mobile structure. Multi-screen business testing. Optimization for touch interactions. Real-world mobile e-commerce cases.
Lazy loading techniques for mobiles. Expert CSS/JS minification. Core Web Vitals for Mobile First. Responsive image management with AVIF/WebP. Exercises on reducing bundle sizes. Red thread project: mobile performance boost. Professional Lighthouse tools. Business caching strategies. Real-device testing on varied devices. Expert mobile SEO focus.
JS hooks for fluid Mobile First. Advanced touch gestures. Expert Mobile First PWAs. Service Workers for offline functionality. Professional exercises on mobile APIs. Red thread project: touch interactions. Debounce/Throttle for performance. Integration of frameworks like React for Mobile First. Real business app cases. Mobile ARIA accessibility.
Secure Mobile First PWA deployment. Monitoring tools like Sentry. Professional mobile A/B testing. Business Mobile First scalability. Finalization of red thread project. Expert presentation and feedback. Maintenance best practices. Final performance audit. Post-training certification resources. Evolutionary strategies for web teams.
Target audience
Front-end developers, UX/UI designers, and web project managers seeking to upskill in Mobile First
Prerequisites
Advanced mastery of HTML5, CSS3 Flexbox/Grid, JavaScript ES6+, and responsive design
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