Rebuild your web application without breaking everything
Your application is slow, ageing or blocking your evolutions? We rebuild it on a modern stack, progressively and without service interruption. Audit, migration plan, controlled rewrite.
Request an audit
Give your application a second life
A sluggish application, a technology that is no longer maintained, changes that take longer and longer to ship: at some point, patching is no longer enough and technical debt ends up slowing everything down. A rebuild means reconstructing your application on solid foundations, while keeping what makes its value — your data and your business logic.
We always start with an audit: what is worth keeping, what must be rewritten, the security flaws to fix, and above all in what order. You leave with a costed migration plan, not a promise of a clean slate.
The rebuild happens progressively, module by module, without cutting the service: your users keep working while the application modernises in the background. This is the so-called "strangler" approach, and we explain the choice between a full rewrite and progressive modernisation on our blog — the latter is almost always safer.
On the technical side, we rebuild on a modern, durable stack: Next.js and React for the interface, Django or Python on the back-end. Enough to last several years without piling up new debt.
If your code doesn't need a rebuild but simply needs to be taken over and maintained, that's a different service: see our code takeover. A rebuild changes the stack and the architecture — not just the maintainer.
Rebuilds adapted to each situation
A startup has a product coded hastily during the MVP phase that no longer handles the load.
Progressive rebuild of the back-end towards a scalable stack, data migration and interface overhaul, without stopping growth.
An administration has a business application built on obsolete, unmaintained technology.
Audit, migration plan to a modern and accessible stack (WCAG), module-by-module reconstruction with service continuity.
An SME has an old internal software (Access, VB or dated PHP) that hinders its activity.
Rebuild into a modern web application (Django/Next.js), migration of existing data and training of teams on the new tool.
A federation has an ageing tool whose vendor has disappeared.
Custom reconstruction at feature parity, then experience modernisation, reusing the existing data.
Our rules for rebuilding without breaking what already runs.
Module-by-module switch
Old and new versions run side by side during the migration, with no single switch-over day.
A costed migration plan
The audit says what to keep, what to rewrite, and above all in what order.
Data carried over and checked
Your database migration is validated by tests, history and references included.
A stack picked to last
Next.js and React for the interface, Django or Python on the server side.
Business logic preserved
It's the foundations that change, not the way your teams work.
Results you see early
The first batches reach production within the opening weeks of the rebuild.
Maintenance reopened
Mainstream technologies, so your tool no longer depends on one single developer.
Security brought up to date
Outdated dependencies and flaws found during the audit are fixed as we rebuild.
Concrete custom development achievements
Identify levers to strengthen farm autonomy
An extranet to centralize all information and documentary resources
Offer a mortgage simulation that matches real lending conditions
Provide tools to master energy consumption
Carry out genomic sequencing projects
Identify levers to strengthen farm autonomy
An extranet to centralize all information and documentary resources
Offer a mortgage simulation that matches real lending conditions
Provide tools to master energy consumption
Carry out genomic sequencing projects
Identify levers to strengthen farm autonomy
An extranet to centralize all information and documentary resources
Offer a mortgage simulation that matches real lending conditions
Provide tools to master energy consumption
Carry out genomic sequencing projects
A progressive rebuild, without disruption.
When the technology is no longer supported, when every change is costly and risks breaking everything, or when hiring for that stack becomes impossible. If the application is healthy but simply ageing, a code takeover is often enough: it is mainly the level of technical debt and the state of the architecture that tip the balance towards a rebuild.
We proceed module by module (strangler approach): we replace one part at a time, the old and new versions coexist, and the switch happens progressively. At no point are your users left without a tool.
Yes. Data migration is an integral part of the rebuild: we take over your existing database, clean it up if needed, and the migration is validated by automated tests. Your history and references stay intact.
A code takeover keeps the existing code and improves it. A rebuild keeps the idea and the data but changes the stack and architecture. A rewrite starts from scratch. We compare these options in full rewrite or progressive modernisation: a progressive rebuild is the best compromise, real modernisation without the risk of a "big bang" project.
It depends on the scope. An audit with a costed migration plan sits between €5k and €12k. The progressive rebuild starts around €30k–€60k for a mid-size application. It is generally two to three times less risky than a full rewrite carried out in one go.
The audit and scoping take 2 to 4 weeks. The progressive rebuild then spans several months, delivered in regular batches: you see results within the first weeks. An upfront project scoping, backed by a clear requirements document, secures the scope and budget.
What a well-run rebuild brings you.
A progressive rebuild gives you back an application that is fast, secure and pleasant to use, without the trauma of a project that drags on or a risky switch-over.
On a modern stack, changes become simple and fast again: you ship new features in days rather than months, and hiring developers is no longer a headache.
And because we keep your data and your business logic, your teams are not lost: they find their bearings in a tool that is simply more modern and more reliable.
What you gain from a rebuild:
A faster application with controlled response times
Security brought back up to date (dependencies and vulnerabilities fixed)
A modern, durable stack, ready for your future changes
A progressive migration, with no service interruption
Easier maintenance and hiring on mainstream technologies
An architecture designed to scale
Ready to get started?
From scoping to prototype, to AI integration.
We support your business software projects from start to finish.