A result, not a deliverable
A website is not finished when it goes live, but when it does what it was designed for: calls, enquiries, sales. Every project starts from that goal, and we measure it afterwards.
Expertise & method
Websites designed for results, and measured afterwards.
KAYZEN is an independent web design and AI agency based in Lyon's 9th arrondissement since 2023. Our method comes down to three phases and one rule: publish our figures as openly as our work, and stand by them.
40
published projects
each with its own case study
99/100
average SEO score
across 32 measured projects
96/100
average accessibility
21 projects at 95 or above
85/100
average performance
our area with the most room to improve, explained project by project
What guides us
Four principles, upheld on every project
They explain our technical choices, our prices and what we refuse to do. They apply to a €1,599 showcase website just as much as to a business application.
Technical restraint
Few dependencies, lightweight pages, code we review ourselves. What is not there cannot slow the site down, break or become a security hole. It is also what makes the scores possible.
One point of contact, in Lyon
You speak to the person who designs and builds your website, not to a project manager passing messages along. Decisions are made quickly, and nothing gets lost between intermediaries.
Published figures
Every project shows its Lighthouse results — including those that still need work, with an explanation. We would rather show a justified 84 than an unverifiable 100.
How a project unfolds
Three phases, with deliverables at each
You always know where the project stands, what has been approved and what comes next. Each phase ends with something you can read, test or sign off.
Audit & strategy
Understand before building.
We start from your business, not from a template: who your customers are, how they search for you, who is taking market share from you in Lyon and why. If you already have a website, we audit it — speed, indexing, user journeys, security. You leave with a roadmap and a firm quote.
What you receive
- Analysis of what your customers actually search for
- Audit of your existing website, if you have one
- Site structure and key messages for each page
- Detailed quote within 24 hours
Bespoke design
Nothing is coded before it is approved.
The mock-ups show the website as it will be, on desktop and mobile: information hierarchy, button placement, real copy. You approve them, you amend them, and only then do we build. No purchased themes, no templates reused from one client to the next.
What you receive
- Interactive desktop and mobile mock-ups
- Copy written or rewritten for the web
- Verified accessibility and contrast guidelines
- Development in React and TypeScript, with an integrated CMS if you want editorial independence
Launch & growth
Going live is a beginning.
We handle the domain name, the certificate, redirects, Search Console and your Google Business Profile. Training makes you independent for day-to-day updates. For thirty days we monitor and fix; after that, maintenance and SEO can take over if you wish.
What you receive
- Full launch and redirects from your old website
- Onboarding training and a personalised guide
- 30-day follow-up included
- Launch report: rankings and performance
What we always deliver
Six standards, set down in writing
They do not depend on the package or the budget. They are checked before delivery and, for the most part, you can verify them yourself afterwards.
Measured performance
Every page is tested with Google's tools before delivery. The scores are published in the project's case study.
RGAA / WCAG 2.1 accessibility
Contrast, keyboard navigation, screen readers: the European Accessibility Act has applied since June 2025, and we deliver compliant websites (RGAA is the French accessibility standard).
Built-in SEO
Semantic markup, structured data, sitemap, prerendered pages: the website is readable by Google from day one.
GDPR and security
No trackers before consent, security headers, SSL certificate and backups, up-to-date legal notice.
A stack we master
React 19, TypeScript, Tailwind and Vite for bespoke builds; an integrated open-source CMS (Payload) when editorial independence comes first. Versions are published on the Stack page.
Local roots
Based in Lyon's 9th arrondissement, we know local search habits, neighbourhoods and regional funding. AI projects are run remotely, anywhere in France.
Out of honesty, and self-interest
What we don't do
An agency is also judged by what it turns down. These five rules have cost us a few contracts. Above all, they have kept us the others.
- No invented customer reviews, and no unverifiable aggregate ratings.
- No marketing figure without a measurement behind it: our statistics are calculated from the portfolio data.
- No tracker set before your consent, neither on your website nor on ours.
- No website you would not own: the code, domain and content belong to you.
- No deadline announced that we cannot meet: the quote specifies the package and its duration.
The method, applied
Three projects, told decision by decision.
The context, the constraints, the design and technical choices, the SEO set-up and the measured scores — including those that can still be improved.
Construction & tilingDamien Mugnier
97, 100, 100, 100: a flawless Lighthouse run on a photo-heavy site.
Read the case study97Performance: 97 out of 100100Accessibility: 100 out of 100100Best practices: 100 out of 100100Search engine optimisation: 100 out of 100
Local shopsBoucherie de l'Avenue
An artisan butcher treated like a luxury house — because that is what it is.
Read the case study69Performance: 69 out of 10093Accessibility: 93 out of 100100Best practices: 100 out of 100100Search engine optimisation: 100 out of 100
Web application & open sourceDocuSûr
Thirty-one PDF tools, and not a single byte of any document sent to a server.
Read the case study95Performance: 95 out of 100100Accessibility: 100 out of 10092Best practices: 92 out of 100100Search engine optimisation: 100 out of 100
Frequently asked questions about how we work
It depends on the package: 2 to 4 weeks for a Core showcase website, 4 to 6 weeks for a Craft website, 6 to 10 weeks for a Legacy project (e-commerce, customer area, advanced features). The schedule is set out in the quote, with approval milestones.
The person who designs and builds your website. There is no sales layer between you and the work: your comments on a mock-up are handled by the person who drew it.
Because a figure you can check is worth more than a promise. Across the 32 measured projects, the average SEO score is 99/100 and performance 85/100: that is our area with the most room to improve, and every low score is explained on the page of the project concerned.
No. Every website is designed for the business it serves. When a client wants to manage a blog or catalogue themselves, we integrate an open-source CMS (Payload) into a website designed for them, rather than adapting an off-the-shelf theme.
You leave with everything: the code, the domain name, access to hosting and to your Google accounts. We document the project so that another developer can take it over. The freedom to leave is part of the service.
Thirty minutes is enough to know whether we can help you, and at what price. The consultation is free and with no obligation.
Or browse our 17 services and our published prices.