Combien coute le developpement d'une application metier sur mesure ?

Le budget depend de la complexite fonctionnelle. Un outil de gestion simple demarre autour de 5 000 EUR. Un ERP complet avec plusieurs modules peut atteindre 30 000 a 80 000 EUR. Un cadrage initial gratuit permet d'estimer le budget avant tout engagement.

Puis-je faire evoluer l'application apres la livraison ?

C'est precisement l'interet du sur-mesure. L'architecture est pensee des le depart pour accueillir de nouveaux modules. Ajouter une fonctionnalite sur une base existante bien concue coute beaucoup moins cher que de repartir de zero.

Est-ce que je suis proprietaire du code source ?

Oui. A la livraison, vous recevez l'integralite du code source, la documentation technique, et les acces au depot Git. Vous etes libre de faire evoluer le projet avec un autre prestataire si vous le souhaitez.

Combien de temps faut-il pour developper une application metier ?

Un outil de gestion simple : 4 a 8 semaines. Une application plus complexe avec plusieurs modules : 3 a 6 mois. Un ERP complet : 6 a 12 mois, deploye progressivement par lots fonctionnels.

Comment est geree l'hebergement de l'application ?

Plusieurs options selon vos contraintes : hebergement sur vos propres serveurs, VPS dedie, ou plateforme cloud (OVH, Scaleway, AWS). Je configure le deploiement avec Docker pour garantir la reproductibilite et faciliter la maintenance.

Proposez-vous de la formation et du support apres livraison ?

Oui. Chaque livraison inclut une session de formation pour vos equipes. Je propose ensuite un contrat de maintenance optionnel couvrant les mises a jour de securite, les corrections de bugs et un volume d'evolutions mineures.

Combien coute ce type de prestation ?

A partir de 3 000 EUR HT pour un outil metier simple. Un ERP sur-mesure complet : 8 000 a 15 000 EUR HT. Chaque projet est chiffre precisement apres un audit gratuit.

Custom Business Application Development

When no software in the market fits your work style, we build it.

Standard software not suitable for your profession?

A monthly subscription for software where you use only 20% of the features. The rest gets in the way. And your teams compensate with Excel, copy-paste between tools, manual processes.

The functions you need are missing, and you are paying for those that serve no purpose
Exploded data between three tools that don't communicate with each other - manual re-entry at each step, makeshift exports in CSV
Your business processes do not fit within the software's cases
An editor that decides for you: its prices, its updates, its schedule

A custom-built business application, it's a tool tailored around your work style. Not a generic software that forces your processes into predefined boxes.

What I am developing

Freelance Django Developer, I design custom enterprise-level web applications. The architecture is designed to evolve: Django ORM, version-controlled migrations, REST API with DRF if needed for integration.

Custom ERP

Commercial management, inventory, invoicing, dashboards. A professional software SME that does exactly what you need, nothing more. Normalized Django models, customized admin for your teams to be autonomous without heavy training.

Secured Client Portals

Project tracking, documents, invoices. Access via HMAC-signed link, no password to manage.

Internal Management Tools

Planning, approval workflows, activity tracking. Custom internal tools that replace your manual processes.

Personalized CRM

Not a discounted Salesforce. A custom CRM tailored to your sales cycle for you, with fields, steps, and follow-ups that match your reality -- not that of an American publisher.

Field Applications

Mobile input, geolocation, offline mode. Typically: a technician who fills out their intervention report on a tablet, even without a network, and it synchronizes upon returning to a covered zone. Progressive Web App, no need to go through the stores.

Enterprise Intranets

Document database, directory, collaborative spaces.

Ready to move forward?

Free quote within 24 hours, no commitment.

Request a quote

Examples of Realizations

Some projects led for SMEs and ETIs, anonymized for confidentiality concerns.

Job Application Management Platform -- HR Service

Sort CVs by configurable criteria, tracking candidate's progress. Before that, everything was passing through a shared email box and a Google Sheet with 47 columns.

Logistics Planning Tool

Organizing tours, optimization of loadings, real-time GPS tracking. Interface Carto Leaflet for dispatchers, PWA for drivers. Backend Django + Celery for asynchronous route calculation. PostgreSQL with PostGIS for geospatial queries. The previous version ran on an Access 2007 - not a joke.

Invoicing Application with PDF Generation

Proposals, invoices, and conforming PDFs generated using ReportLab (Python 3.11), automatic re-runs via Celery Beat. Banking integration via OFX import.

Secure client portal

Access via HMAC-SHA256 signed link -- no password, no account creation. The client clicks, they see their documents, the progress of their project, their history. Email notifications at each update (Django signals + MJML templates).

Custom Solution vs. Standard Software

A custom solution isn't always the best answer. But when your profession has specific needs that generic tools don't cover, the comparison leans quickly towards that option.

Criterion	Custom Application	Standard Software (SaaS)
Cost over 3 years	High initial investment. Subsequently, moderate maintenance and no per-user cost. Over 3 years, it often proves less expensive, but the budget needs to be advanced.	Low entry cost, but the subscription often exceeds the customized price when accumulated over 3 years with 15+ users.
Adaptability	The tool integrates with your processes. However, each modification requires a developer - it's not drag & drop.	You adapt your processes to the software. It works as long as your profession is not too specific.
Data Property	PostgreSQL Database on your Servers or VPS. You manage your backups, your exports.	Data with the publisher. The export usually exists, but the format and completeness may vary.
Independence	Source code is yours. Git repository delivered. Another developer can take over the project.	Dependency on the editor: its prices, its product choices, its longevity.
Rate of Evolution	New features in days or weeks. You decide on the priorities.	You are waiting for the editor's roadmap. Sometimes months, sometimes never.

Technical Stack

Mature, open-source technologies, widely adopted. No exotic framework or dependence on a proprietary ecosystem. The choice of Django and Python guarantees readable, maintainable code, and an active community for long-term support.

Django Python PostgreSQL JavaScript HTML5 CSS3 Docker Gunicorn Nginx Redis Celery Git CI/CD

How does a project proceed

In essence, five steps. The details may vary depending on the size of the project.

Setting

A call or an appointment to understand your activity, your current tools, what's holding you back. Free.
Functional Requirements Document

I am drafting a document that describes what the application will do, screen by screen, function by function. With mockups if necessary. You will validate it before I touch the code. This document serves as a reference for the entire project -- if it's not included, it's not planned, and conversely.
Iterative development

Sprints lasting 1 to 2 weeks. At the end of each sprint: live demo, testing on a staging server, providing feedback.
Recipe, deployment, and production

Automated tests (using pytest and Selenium for critical paths), recipe with your teams on a pre-production environment. Deployment of Docker on your infrastructure or VPS, with CI/CD, HTTPS, monitoring.
Training and Maintenance

Practical training session for your teams. Technical documentation provided. Subsequently, optional maintenance contract for secure updates, fixes, and evolutions.

Create your professional tool

Describe your needs, I will respond within 48 hours with an initial analysis and an estimate.

Your request has been sent. I will get back to you within 48 hours.

An error has occurred. Please try again or contact me directly.

Frequently Asked Questions

How much does it cost to develop a custom business application?

It really depends on the scope. A simple management tool with a few screens starts around 5,000 EUR. A custom multi-module ERP is typically between 30,000 and 80,000 EUR. The initial consultation is free – it allows for an estimate before committing.

Can I evolve the application after delivery?

Yes, and that's where the customization truly makes sense. The Django architecture (modular apps, version-controlled migrations, API DRF) is designed for this. Adding a module on a clean base costs a fraction of what a custom development from scratch would cost. After that, it depends on the complexity of the new module - we'll discuss it when the time comes.

Am I the owner of the source code?

Yes. Source code, technical documentation, Git access - all will be delivered to you.

How long does it take to develop a custom application?

In short: simple tool, 4 to 8 weeks. Multi-module management application, 3 to 6 months. Complete ERP, 6 to 12 months -- but we deliver in phases, so you can start using the first modules well before the end.

How is hosting managed?

Your servers, a VPS (OVH, Scaleway), cloud - it's you who chooses. I deploy with Docker and docker-compose, which makes the installation reproducible. In other words: a `docker compose up` and it's live. Monitoring (uptime, logs, alerts) is part of the service.

Do you offer training and support?

Practical training included with delivery. Afterwards, optional maintenance contract (security, bugs, minor updates). Not mandatory - the code is yours in any case.

What is the cost for this type of service?

From 3,000 EUR excluding tax for a simple professional tool. A fully customized ERP solution: 8,000 to 15,000 EUR excluding tax. Each project is precisely priced after a free audit.