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Training Mobile First - Designing High-Performance Responsive Websites

Course created on July 27, 2026Updated on October 5, 2026

On quote$4,620

4 days
Onsite
10 people max.

Request a quote See the program

Ref: OUG293

10 people max.

On quote$4,620

In-company rate: on quotefrom $7,865 for the whole team

On-site and certification exam on quote

4 days

Onsite

Don't let this gap widen

Why this program matters

Without a Mobile First approach, 53% of mobile web traffic is lost according to Statista, resulting in a 40% drop in e-commerce conversions.
Mobile-unoptimized sites cost SMEs an average of 25 000€ per year in missed opportunities.
Teams without these skills spend 35% more time on urgent redesigns, risking Google penalties and competitive lag.
In 2024, 68% of recruiters reject profiles unfamiliar with mobile-first responsive.
Every desktop-first project widens the gap with agile digital leaders.

Trusted by — schools, companies and industrial groups

25,730 programs · 25 countries

Every program built with a dedicated engineer

Companies: Aptar, ArcelorMittal, Equans, EDF, Ubisoft and Microsoft.

Learning objectives

Master Mobile First principles for professional interfaces
Develop skills in adaptive responsive design in a business context
Design optimized mobile layouts with CSS Grid and Flexbox
Implement media queries for a smooth user experience
Optimize mobile performance in a certified training
Integrate Mobile First into real and scalable web projects

Program

Module 1Mobile First Fundamentals: Principles and Development Environment (media queries, inspector tools)

Dive into the basics of Mobile First by setting up a dedicated environment with Chrome DevTools inspectors and Firefox Responsive Design Mode, understand why 53% of web traffic is mobile according to Statista, apply the first principles to a thread project prioritizing small screens, complete practical exercises to structure semantic HTML optimized for mobile, test adaptations in real time, and produce your first responsive wireframe validated by the trainer.

Module 2Mobile First Layouts: Flexbox and CSS Grid for Flexible Structures (practical exercises, use cases)

Master Flexbox and CSS Grid applied to Mobile First by refactoring desktop layouts to mobile, use properties like flex-direction and grid-template for perfect alignments on smartphones, integrate concrete e-commerce and portfolio cases, perform collaborative remote exercises with screen sharing, optimize for different screen orientations, generate testable interactive prototypes, and receive personalized feedback for rapid progression to professional skills.

Module 3Mobile First Media Queries: Advanced Adaptations and Performance (breakpoints, image optimization)

Deepen media queries in Mobile First for intelligent breakpoints adapted to real devices like iPhone and Android, set up conditional styles with progressive min-width, integrate image optimization via srcset and picture for fast mobile loading, simulate tests on emulators and real devices via BrowserStack, apply to your thread project with a focus on loading speed, measure Core Web Vitals, and produce a concrete optimization report for the business.

Module 4Mobile First Projects: Full Integration and Deployment (frameworks, user testing, production)

Finalize your Mobile First application by integrating Bootstrap or Tailwind to accelerate responsive development, conduct user tests on mobile with tools like Google Mobile-Friendly Test, deploy on Netlify or Vercel with PWA configurations for offline use, analyze Lighthouse metrics for a perfect score, present your thread project in a defense, receive certification, and get an action plan to implement Mobile First in your professional projects right away.

Evaluation method

Multiple-choice quiz to validate learning outcomes at the end of the training
Continuous assessment through practical Mobile First exercises
Defense of the responsive thread project in front of the trainer

Learning method

Courses led by a Mobile First expert trainer
Practical exercises on real mobile business cases
Progressive thread project using the Mobile First approach
Complete course materials provided to each participant

Methods, materials and delivery

The Training Mobile First - Designing High-Performance Responsive Websites program is delivered onsite or remote (blended-learning, virtual classroom, remote presence). At Learni, an industry-certified training organization, every program is built to maximize skills acquisition regardless of the chosen format.

The trainer alternates between demonstrative, interrogative and active methods (through hands-on labs and/or scenarios). This pedagogical approach guarantees concrete learning that's immediately applicable at work.

Equipment required

For the smooth delivery of the Training Mobile First - Designing High-Performance Responsive Websites program, the following equipment is required:

Mac or PC computers, high-speed fiber internet, whiteboard or flipchart, projector or interactive touch screen (for remote sessions)
Training environments installed on workstations or accessible online
Course materials, hands-on exercises and complementary resources
Post-training access to materials and educational resources

For intra-company training on a site outside Learni, the client commits to providing all required teaching materials (computers, internet, etc.) for the smooth delivery of the program in line with the prerequisites in the communicated program.

* contact us for remote delivery feasibility** ratio varies depending on the program

Skills assessment methods

Assessment of skills acquired during the Training Mobile First - Designing High-Performance Responsive Websites program is performed through:

During training: case studies, hands-on labs and professional scenarios
End of training: self-assessment questionnaire and skills evaluation by the trainer
After training: completion certificate detailing acquired skills

Program accessibility

Learni is committed to making its programs accessible. All our programs are accessible to people with disabilities. Our teams are available to adapt the pedagogical methods to your specific needs. Please contact us for any adjustment request.

Enrollment terms and lead times

Registration is possible up to 48 business hours before the start of training. All our programs are built for corporate L&D budgets and delivered onsite or remotely.

The Learni story

Founded by engineers and learning experts, Learni's mission is to make high-impact tech training accessible to teams everywhere. We work remotely with organizations across the US and Canada, in your time zone, to help teams upskill fast.

Our method

Training quality, guaranteed at every step

Before, during, after: we frame the brief, introduce the trainer, tailor the content and measure impact. You stay in control from kickoff to wrap-up.

Step 1

Rigorous trainer selection

Each trainer is validated on three criteria: hands-on field expertise, proven pedagogy and alignment with your industry.

Triple validation: technical, pedagogical, sectoral.
Minimum rating 4.8/5 over the last 12 sessions.

Step 2

You meet the trainer beforehand

30-minute video call between you and the selected trainer to validate the fit, adjust content and clear any final doubts.

Live briefing on goals and team context.
Veto right — we swap the trainer for free if needed.

Step 3

Content tailored to your context

No recycled slides. The syllabus is reworked from your real cases: tools, constraints, vocabulary, ongoing projects.

Hands-on cases drawn from your stack and projects.
Program co-written then validated by your team.

Step 4

Continuous quality follow-up

Live evaluations, 30/90/180-day check-ins and a consolidation plan. If the impact misses the mark, we rework it.

NPS, knowledge quizzes and skills self-assessment.
Satisfaction guarantee: fully satisfied or free rework.

A simple promise: you don't pay to discover the trainer on day one. Everything is validated upfront, by you.

A child walking to school with a backpack

Our social commitment

A school kit donated to a child for every training booked

To fight inequalities in access to education, Learni donates a complete school kit to a child in need for every training booked. You build your skills, a child heads back to school.

Backpack, notebooks and essential supplies
Distributed through our partner charities
Included, at no extra cost to you

Enroll and offer a kit

FAQ

Frequently asked questions

Which tools are used in Mobile First training?+

Hands-on work runs on media queries, inspector tools, practical exercises, use cases, breakpoints and image optimization. Those tools come from the Mobile First program itself, delivered on site over 4 days, so participants practise on the stack they will use at work.

What can participants do after Mobile First training?+

They can master Mobile First principles for professional interfaces, develop skills in adaptive responsive design in a business context and design optimized mobile layouts with CSS Grid and Flexbox. Those are the stated objectives of the Mobile First program at Beginner level, checked by the end-of-session assessment.

What does the Mobile First program cover, day by day?+

Day 1: Mobile First Fundamentals: Principles and Development Environment (media queries, inspector tools). Day 2: Mobile First Layouts: Flexbox and CSS Grid for Flexible Structures (practical exercises, use cases). Day 3: Mobile First Media Queries: Advanced Adaptations and Performance (breakpoints, image optimization). Day 4: Mobile First Projects: Full Integration and Deployment (frameworks, user testing, production). The Mobile First program runs over 4 days, delivered on site.

How is Mobile First training assessed?+

Assessment relies on multiple-choice quiz to validate learning outcomes at the end of the training, continuous assessment through practical Mobile First exercises and defense of the responsive thread project in front of the trainer. Learni issues a completion certificate together with the individual assessment report at the end of the Mobile First program, which an L&D team can file as evidence.

How much does Mobile First training cost per participant?+

Mobile First training is priced on quote. The amount depends on headcount, format and how far the syllabus is tailored to your team. A detailed quote is sent within one business day, and team pricing covers the whole group from the second participant.

How long does Mobile First training take?+

4 days, available live online (US time zones) or on-site at your offices. Half-day tracks spread over several weeks are possible so the team stays operational.

Who pays for Mobile First training?+

Most US teams pay directly through their company L&D or training budget. Learni invoices in US dollars and accepts bank transfer (ACH/wire) or card, with volume pricing for teams. A purchase order is welcome.

What do participants need to know before Mobile First training?+

Basic knowledge of HTML5 and CSS3.

Is a certificate issued after Mobile First training?+

Yes. A Learni completion certificate is issued, along with the individual evaluation report. Learni is a certified training provider and prepares for third-party certifications, but does not award them itself.

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