Aetherio
Web & AI agency in Lyon

Web agency in Lyon, design & development

We build business applications, SaaS products, AI integrations and fast websites for companies across the Lyon metropolitan area.

Aetherio - Agence web à Lyon
Aetherio, agence web et IA à Lyon

An agile web agency in the heart of Lyon

Aetherio is a web and AI development agency based in Villeurbanne, founded by Valentin Muller. Around the technical team, we bring in a network of experts (design, SEO, content, photo and video) as each project requires.

This model assembles the right team for each project and delivers faster, without traditional agency overhead.

We target measurable performance, adapt to your needs, the trust relationship and the respect of your budget.

Based in Villeurbanne, we work across the Lyon metropolitan area and remotely anywhere in France.

Web agency services in Lyon

From identity to performance, a complete expertise chain

01

Website creation

Showcase, e‑commerce, corporate: SEO‑ready, easy to manage, fast and conversion‑oriented for Lyon.

02

Web application development

SaaS, portals, back‑offices: modern architecture (Vue/Nuxt/Node), security, scalability and user experience.

03

UX/UI & Branding

Workshops, wireframes, prototyping, visual identity and design systems for clarity and consistency.

04

Lyon SEO & Content

Technical SEO, internal linking, local semantics (Lyon), editorial plan and performance optimization.

05

Photo / Video (partners)

Authentic visuals to elevate your brand and improve conversion.

06

AI integration

Agents, RAG assistants and n8n automations connected to your tools, with training so your teams actually use them.

Why choose us in Lyon?

0+

Projects delivered

0%

Satisfaction

0+

Years of experience

0

Years of studies

Proximity & responsiveness

Meetings across Greater Lyon, tight project control and direct access to makers.

Complementary expertise

Tech, SEO, design, content & media — a team aligned with your goals.

The agility of a tight team

No salesperson between you and the technical team: short cycles, fast decisions and measurable deliverables.

Tangible results

Shared KPIs, Lyon local SEO, conversion, performance and ROI.

Our latest work

SaaS apps, business tools, applications running in production and bringing in revenue. Each one solved a problem a founder could no longer carry alone.

Kabineo - Application SaaS pour cabinets comptables
Discover

Kabineo

SaaS Product / Co-founded

Kabineo is the SaaS platform for running accounting firms, born from the bespoke Belho Xper tool and turned into a co-founded product, open to every firm.

Produit SaaSCofondateurMulti-tenantNestJS / Vue 3
Vijile - Mockup Application Desktop
Discover

Vijile

Desktop Application / Freelance Tool

Vijile is an automatic, 100% local time tracker for freelancers. It detects your active projects in real time, with zero manual input.

Application DesktopRust / Tauri100% LocalLanding Astro
Fideneo - Tableau de bord de l'application sur un poste d'institut
Discover

Fideneo

Web Application / SaaS

Fideneo is an all-in-one cockpit designed to simplify and automate beauty salon management.

SaaSUX/UIWeb AppCRM

They trusted us

Founders and business owners who had a project, a need, a deadline. Here's what they have to say.

"Disponibilité, réactivité et implication. Valentin est professionnel et pédagogue."

A

Alban B.

CEO Belho Xper

"Il allie une expertise technique pointue à une solide vision business."

C

Charley A.

Co-fondateur Avnear

"Nous avons travaillé ensemble sur la conception d'une automatisation IA pour un E-commerce. Le suivi a été régulier, clair et efficace. Les délais respectés et le résultat impressionnant."

C

Chihab A.

CEO E-commerce

"Valentin a su être à l'écoute de mes besoins et les retranscrires dans une application de gestion de clientèle. Les résultats ont été plus que satisfaisants et de haute qualité."

S

Sandrine V.

Gérante Sandrin's Nail

"Une entreprise qui sait s'adapter parfaitement au besoin client."

S

Stanislas M.

Commercial

"Le site est clair, rapide, et nous permet de mettre en avant nos services de manière professionnelle. Nette augmentation des demandes."

C

Christophe R.

PDG Ravi Groupe

See all client reviews

How we come on board your product

From the first conversation to a product that truly runs in production. A clear process where we act as your product team, not a vendor who ships and vanishes.

01/06
We talk01

We talk

A first conversation to understand what you want to build, your context and where you want to take it. No endless brief, we get straight to what matters.

Scoping and strategy02

Scoping and strategy

We define the scope, priorities and timeline together. We'll challenge your choices when needed: the goal is the right product, not just a spec that got built.

Mockups and validation03

Mockups and validation

We design your product and its flow as mockups. You approve everything before we write a line of code, zero surprises down the line.

Iterative development04

Iterative development

We build in functional blocks and you test as we go. We adjust continuously, with regular updates. Never a three-month tunnel with no visibility.

Production deployment05

Production deployment

Deployment, performance, monitoring. Your product goes into production, ready to hold up under load and actually get used, not just to exist.

We stay on board06

We stay on board

Launch isn't the end, it's the start. We watch the real numbers, fix what breaks, and add the features that actually matter. Your product keeps moving forward, and so do we.

FAQ Web agency in Lyon

Une équipe technique resserrée, fondée et pilotée par Valentin Muller, qui s'appuie sur un réseau d'experts (SEO, design, contenu, média) selon les projets. Vous échangez directement avec les personnes qui conçoivent et développent votre produit.

Oui : identité, design, développement, SEO et média, un seul pilotage, un seul planning.

Sites vitrines dès 2 500€, e‑commerce/développement spécifique dès 5 000€. Devis détaillé après cadrage.

Oui, dans toute la métropole et en France, en présentiel et à distance.

Vue.js, Nuxt.js, Node.js, TypeScript, avec intégration CMS (Strapi, WordPress) si pertinent.

We’ll get back within 24h with a first analysis

Discover my resources