01We 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.
You bring the ambition.We bring the tech.
SaaS, business app, automation, AI: we design, build and ship it. You stay focused on the business, we carry everything else.
Between an idea and a product that truly works, there's a gap. Our job is to bridge it.
What we build with you
It all starts with your business and your real constraints. SaaS, business app or internal tool, we build products made to last and grow with you.
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.
Discover
Kabineo
SaaS Product / Co-foundedKabineo 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.
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Vijile
Desktop Application / Freelance ToolVijile is an automatic, 100% local time tracker for freelancers. It detects your active projects in real time, with zero manual input.
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Fideneo
Web Application / SaaSFideneo is an all-in-one cockpit designed to simplify and automate beauty salon management.
Behind your product, an obsession
Aetherio is a product studio founded by Valentin Muller, developer and entrepreneur. Because we build our own products, we understand your founder challenges from the inside.
Before writing a single line of code, we take the time to understand your business, your market and your constraints. That's how you build products that last, not prototypes you throw away after three months.
We rely on artificial intelligence daily to design, develop and run projects. Paired with real experience and constant tech watch, it lets us go faster and further than was possible just two years ago.
Whether it's a business application, a SaaS or a website, we invest for the long run. Our goal: that your product generates value well beyond launch day.
We don't just deliver a project, we invest in a businessEngagementCustom-builtPartnershipResults
The studio that gets on board with your product
Concretely, here's what changes when we build your product with you.
- 01
We understand your business before we code
We dig into your market, your users and your goals. Code comes after, not before.
- 02
Custom-built, and it's yours
No template, no no-code, zero lock-in. The product is built for you, and the code belongs to you.
- 03
Built to bring in customers
SEO, performance, user journey: every technical choice serves your business.
- 04
Fast to ship, made to last
Results within the first weeks, with code built to evolve, not to be rewritten a year later.
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
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
01
02Scoping 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.
03Mockups 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.
04Iterative 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.
05Production deployment
Deployment, performance, monitoring. Your product goes into production, ready to hold up under load and actually get used, not just to exist.
06We 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.
The tools that keep your products running
The technologies we use daily to build products that are fast, reliable and ready to grow.
Vue.js
Framework frontend réactif
Nuxt
Full-stack Vue, SSR & SEO
TypeScript
Typage strict, code robuste
NestJS
API backend structurée
Tailwind CSS
Styling utilitaire, rapide
Astro
Sites statiques ultra-performants
Three.js
Expériences 3D immersives
Supabase
Auth, database, storage
PostgreSQL
Base de données relationnelle
Redis
Cache & temps réel
n8n
Automatisation de workflows
Figma
Design UI/UX & prototypage
Vercel AI SDK
Intégration LLM en production
Claude Code
Développement assisté par IA
Cursor
IDE augmenté par IA
Frequently asked questions
A question that isn't here? Let's talk directly.
How much does an MVP or custom application cost?
It depends on the scope. An MVP starts around €5,000, a full business application between €10,000 and €30,000. We define the budget together from the first call to avoid surprises.
How soon can my product be live?
An MVP can be in production in 4 to 8 weeks. A full business application takes 2 to 4 months depending on complexity. You get access to intermediate versions throughout development.
Why work with a freelancer rather than an agency?
No middleman, no salesperson. You talk directly to the person who codes your product. It's faster, more transparent, and often cheaper than an agency at equal quality.
Can you support me throughout the product's life?
Yes. I don't disappear after delivery. Maintenance, new features, scaling, I remain your technical point of contact for the long term.
How does payment work?
40% upfront, 60% on delivery. For longer projects, we can split into monthly milestones. Payment by bank transfer.
What if I just have an idea, no specs yet?
That's the case for most of my clients. We start from your idea and build the scope together. That's precisely my role: turning a vision into a concrete technical action plan.
What if my project is too big for one freelancer?
I rely on a network of expert freelancers in their fields: design, marketing, sales, development. Whatever the ambition level of your project, we build the right team. You keep one point of contact, me, and I coordinate the rest.
Have a project? Let's talk.
Free first call, no commitment. Let's see together if we can work on your project.
Discover my resources
Technical Audit Checklist for Vibe-Coded Projects (Lovable, Bolt, Cursor)
Automate Vendor Management and Procurement with AI: The Complete Guide for Businesses
ROI of an AI Project After 6 Months: Key KPIs That Matter Once in Production
Automate Your Competitive Intelligence with AI: The Method and Tools for 2026
AI and Intellectual Property: Who Owns AI-Generated Code or Content?
The True Cost of AI in Production: Beyond the Advertised API Price