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Web Application & SaaS Development

An application that transforms your business

Technical partner who challenges your product vision, architects for scale, and delivers an app built for growth. Not just an executor.

Does your daily routine look like this?

Concrete problems that cost time and money

Your teams lose 10 hours per week on Excel?

We create the tool that automates these tasks so they can focus on strategy.

You lose clients due to a slow manual process?

We develop an automated workflow that processes requests in a few clicks.

Your data is scattered across 5 different tools?

We centralize everything in a single dashboard that synchronizes your ecosystem.

Your team spends 2 hours a day on repetitive tasks?

We automate these processes to free up high-value time.

You have no visibility on your business KPIs?

We create real-time dashboards to drive your growth with clarity.

Have you ever experienced this?

The 3 recurring problems when developing an application without business vision

The developer who codes without understanding

Your developer delivers features... but doesn't understand your business model, your users, or how the app should generate revenue.

The never-ending project

6 months late, budget exploded, and in the end an app that doesn't match what you had in mind.

The app that doesn't scale

Your product takes off... but your tech stack plateaus. Complete rebuild needed = time and money lost.

If you nodded while reading this, it's normal. The problem isn't technical: it's that you needed a strategic partner, not just an executor.

What changes when you work with a business partner, not just a coder

A radically different approach

Classic developer

  • "Tell me what to code"
  • Executes specifications
  • Focus on code
  • "It's done, here's the code"
  • Delivers an app

Strategic partner (Aetherio)

  • "Let's challenge your product vision together"
  • Analyzes your market, competitors, business model
  • Focus on business impact (ROI, acquisition, retention)
  • Post-launch support, iterations, evolutions
  • Delivers a growth tool

My goal isn't to deliver code. It's to deliver a tool that transforms how you work and generates measurable results.

Concrete results for my clients

Applications and sites that transform their business

Fideneo

SaaS Application

Functional SaaS application with scalable architecture

Launched in 3 months

Belho Xper

Professional website

Professional site that showcases business expertise

Custom design

Ravi Nuisible

Website + SEO

+62% organic traffic through technical and SEO optimization

+62% traffic

My Application Solutions

Custom web applications designed to address your business's unique challenges

SaaS Solutions

Create your recurring revenue stream. Multi-tenant SaaS application that scales from 10 to 10,000 users without rebuild.

  • Multi-tenant architecture
  • Subscription management
  • Customizable dashboard
  • Secure API and documentation

Business Applications

Automate to save time and money. Custom solutions that transform manual processes into intelligent workflows.

  • Integration with existing systems
  • Workflow automation
  • Analytical dashboards
  • Advanced document management

How we work together (and why it's different)

A collaborative methodology where you're involved at every step

1

Discovery & Challenge

We don't take your brief at face value. We challenge your product vision, your market, your assumptions.

  • Strategic business workshop
  • Competition and opportunity analysis
  • Real user needs identification
  • Concept validation and expected ROI
2

Architecture & Design

We design architecture that scales with your growth, not just for the MVP.

  • Scalable data modeling
  • Scalable system architecture
  • Conversion-focused UI/UX design
  • Prototyping and user testing
3

Agile Development

Deliveries every 2 weeks. You see progress in real-time, we adjust together.

  • 2-week sprints
  • Regular demos with feedback
  • Short feedback loops
  • Collaborative iterative adjustments
4

Testing & Optimization

Automated testing, security audits, performance optimization. Zero compromise on quality.

  • Automated tests (TDD)
  • OWASP security audits
  • Performance optimization (Core Web Vitals)
  • Client acceptance and validation
5

Launch & Evolution

Launch is just the beginning. We remain partners for iterations and evolutions.

  • Secure production deployment
  • Training and documentation
  • Monitoring and analytics
  • Long-term evolutionary support

The Benefits of My Web Applications

Application solutions that create added value for your business

Scale without rebuild

Scalable architecture that grows with your business, from 100 to 10,000 users without rebuild.

Enhanced security

OWASP + GDPR security, robust authentication, data encryption.

Optimal performance

Optimized loading times to maximize conversion and retention.

Connect your ecosystem

Connect your CRM, payment, marketing via APIs. A central hub for your ecosystem.

Intelligent automation

Automate your workflows to save time and reduce errors.

Actionable data

Real-time analytics dashboards to drive your growth with clear KPIs.

Is this approach right for you?

A premium partnership for ambitious entrepreneurs and companies

This is for you if:

  • You're looking for a partner who challenges your vision (not just an executor)
  • You want an app designed for growth and ROI
  • You're ready to invest in quality (not low-cost)
  • You want to be involved in product decisions
  • You're thinking long-term (scalability, maintenance, iterations)

This is NOT for you if:

  • You just want someone who "executes what I say"
  • Your priority is the lowest price
  • You want a quick solution without strategic thinking
  • You're not open to challenging your assumptions
  • You're looking for a template/ready-made solution

My premium approach is designed for entrepreneurs and companies who want a strategic technical partner. If that's you, book a discovery call.

Book my discovery call

Ready to build an app that transforms your business?

Book a 30min discovery call (free, no commitment). We discuss your project, I challenge your vision, and you leave with actionable insights.

What my clients say about our collaboration

Testimonials from clients who transformed their business with a custom application

"En tant que dirigeant du cabinet d’expertise comptable BELHO XPER je suis ravi de travailler avec Valentin (AETHERIO). Nous avons d’abord collaborer dans le but de dépoussiérer notre site internet. A vrai dire Valentin à effectué une refonte et à coder le site sur mesure pour qu’il colle vraiment à notre identité. J’ai apprécié la disponibilité, la réactivité et l’implication de valentin... et bien sur le résultat final. Valentin est professionnel et pédagogue. Les allers retours et échanges sont fréquents pour éviter tout désagrément. Nous sommes actuellement en train de travailler sur un tout autre projet. Le développement d’une application de GI pour les cabinets comptables. Merci Valentin."

A

Alban B.

CEO Belho Xper

"En tant que chef de mission du cabinet BELHOXPER, j’ai eu le plaisir de collaborer avec Valentin dans le cadre de la refonte de notre site internet. J’ai particulièrement apprécié sa gentillesse, son écoute et surtout sa réactivité tout au long du projet. Valentin a su parfaitement comprendre nos attentes et les retranscrire avec professionnalisme et créativité. Le résultat final a été unanimement salué par l’ensemble de notre équipe : le site reflète désormais fidèlement notre image et offre une expérience fluide et agréable à nos clients. Je recommande vivement ses services à toute entreprise qui souhaite un accompagnement sérieux, humain et efficace pour ses projets digitaux."

A

Alexandre V.

Chef de mission Belho Xper

"Je suis prothésiste ongulaire, j’ai ma propre boutique en ville et je recherchais quelque chose (agenda, portefeuille clientes ….) que je ne trouvais pas j’ai des prestataires qui m’avaient démarché. Valentin a su être à l’écoute de mes attentes, de mes besoins (particuliers) et les résultats ont été plus que satisfaisant et de hautes qualités. N’hésitez pas à confier vos projets à un professionnel comme Valentin. Sandrine."

S

Sandrine V.

Gérante de Sandrin's Nail

"Excellent travail, résultats au rendez-vous ! Nous avons confié à Aetherio la refonte complète de notre site web et nous sommes plus que satisfaits du résultat. Dès le départ, l'accent a été mis sur une optimisation SEO efficace pour générer plus de contacts, et ça fonctionne ! Le site est clair, rapide, et nous permet de mettre en avant nos services de manière professionnelle. Depuis sa mise en ligne, nous avons remarqué une nette augmentation des appels et des demandes de renseignements. Merci pour le suivi attentif et les explications claires tout au long du projet. Si vous cherchez quelqu'un de sérieux et passionné pour développer votre présence en ligne, je recommande Aetherio sans hésitation !"

C

Christophe R.

PDG Ravi Groupe

Frequently Asked Questions

A website primarily presents static information, while a web application offers complex interactive functionality: data management, user authentication, business workflows, and admin interfaces. Web applications are designed to be scalable and can handle large amounts of data.

Cost varies based on complexity: a simple application starts at €5,000, a standard business application between €10,000 and €25,000, and complex SaaS solutions can reach €50,000 and above. I offer a free audit to precisely assess your needs.

I use a modern and performant stack: Vue.js 3 and Nuxt.js for the frontend, Node.js or Nest.js for the backend, TypeScript for code robustness, and PostgreSQL or MongoDB for databases. This stack guarantees performance, security and scalability.

Absolutely! I develop custom APIs and use connectors to integrate your application with your existing tools: CRM, ERP, payment solutions, marketing automation services, or any other business solution. Integration is planned from the design stage.

Security is integrated from conception: robust authentication, data encryption, protection against OWASP vulnerabilities, automatic backups, and security monitoring. I comply with GDPR standards and implement security best practices.

Yes, I architect applications for scalability: modular code, optimized database, elastic cloud infrastructure, and microservices architecture if necessary. Your application can grow with your business without a complete rebuild.

A cheaper developer delivers code. A strategic partner delivers a growth tool. The difference? I challenge your product vision, analyze your market, think ROI from conception. Result: you save on costly mistakes (6 months lost, rebuild needed, app that doesn't scale). The real cost is an app that doesn't perform.

2-week sprints with regular demos. You see progress in real-time via collaborative tools (Slack, Notion, GitHub). Weekly checkpoints for feedback and adjustments. Total transparency on progress, challenges, technical decisions. You're not a spectator, you're co-creator of your application.

That's exactly why I code with modular architecture. Adding features, integrating new services, or pivoting on certain aspects is simple and fast. Documented code, automated tests, and I remain available to support evolutions. Launch is just the beginning of the partnership.

Do you have other questions?

Web Application Resources