Your applicationsmodernised,without disruption.
Audit, migration plan, progressive rebuild. We keep what works, replace what blocks, without freezing your developments or creating permanent dependency.
Three principles,
that distinguish modernisation from a rewrite.
An application that slows down your business doesn’t need to be discarded. It needs to be read, understood, and rebuilt piece by piece—while operations keep running.
Gradual migration
Old and new coexist until full switch. Your teams keep working while we modernise. No business interruption, no freeze on ongoing developments.
We reuse what exists, we don’t discard it
PHP, Java, .NET, Symfony, legacy Rails, Bubble, Airtable: we audit, extract what holds value, rebuild what needs to be. No rewriting for the sake of it.
Handover to internal teams included
Documentation, code reviews, training. Our goal isn’t to become indispensable. You take back control whenever you want—it’s part of the scope, not an add-on.
AI speeds up the process,
not blindly.
Most integrators modernise manually. We use AI to read, rebuild and document faster and more reliably—with human oversight at every step, and your code never leaves your premises.
Understanding a codebase no one masters anymore
AI agents read and map a massive, undocumented codebase: dead code, hidden dependencies, missing documentation reconstructed. The riskiest phase of a modernisation becomes quantifiable—we illuminate blind spots before any commitment.
Migrating without breaking
Non-regression test generation to ensure old/new equivalence, assisted porting (PHP → TypeScript), documentation produced as we go. AI handles the repetitive; our devs retain architectural decisions.
Documentation that doesn’t age
Documentation generated and kept up to date alongside the code, so your teams can take over—without depending on us or static docs delivered on launch day.
Four modernisation scenarios.
Four concrete cases with documented deliverables and production feedback. Not an abstract promise of “we can take over anything” — a scope we commit to.
Ageing monolithic application
Outdated stack, heavy technical debt, no one knows how to evolve it. We audit, plan, and replace module by module — without breaking what’s running.
No-code tool that has hit its limits
Bubble, Airtable, FlutterFlow that can no longer handle the load or business rules. Switch to maintainable code without losing data or users.
SaaS locked into an old stack
A product that runs but is becoming hard to maintain, evolve, or pass investor audits. Targeted reconstruction of critical modules.
Hard-to-maintain internal tool
Custom ERP, in-house back-office, business scripts accumulated over the years. We modernise without rewriting everything — we take over what holds value.
What we modernise towards.
Scroll’s standard target stack — modern, maintainable, recruit-friendly. No exotic tech without a future. The source code returns to you, in your Git, with no permanent dependency on Scroll.
Frontend
Ops / Hosting
Monitoring
JeRêveDuneMaison: from a rigid business app to a modern stack.
Business application for managing property hunter mandates, clients, and administrators. Progressive migration to Next.js + Supabase + PostgreSQL, with full documentation and support. Coexistence of old and new systems until the final switch.
Read the full case studyFour steps, no big bang.
A dedicated team from scoping to delivery, with a dedicated project lead
The existing system, independently.
System mapping, identification of bottlenecks, technical debt assessment, success criteria. Deliverable: diagnosis + migration plan + estimate. 1 to 3 weeks.
The migration plan.
Which modules to keep, which to replace, in what order, and with what coexistence. Validation with your IT and business teams before any development. No surprises along the way.
Module by module.
2-week sprints, delivery by modules. Your users switch over gradually, without disruption. Automated testing and monitoring from the first module in production.
Final switch and autonomy.
Decommissioning of the old system, team training, final documentation. Progressive handover to internal teams if desired — your IT regains control before the contract ends.
What you get at the end.
A modernisation is only successful if your teams take back control. The source code returns to you, your devs are trained, and legacy subscriptions are terminated. No irreversible decisions.
Source code is yours
TypeScript reviewed, tested, and documented. In your Git, under your license. Not a blob exported from a third-party tool.
Data preserved
Historical data migration, integrity verified, process documented. User history is never compromised.
Teams trained
Training sessions, pair programming, documentation. Your devs take back control before the contract ends. No permanent dependency.
Legacy decommissioned
The old system is phased out gradually, module by module, after validated migration of each scope. No abrupt shutdown.
Frequently asked questions
The most common questions we get during scoping. If yours isn’t here, get in touch!
Should we modernise now?
Modernisation is never urgent… until an event makes it urgent. If any of these signals resonate with you, the audit (1 to 3 weeks) will tell you where you stand—with no reconstruction commitment.
Due diligence before a funding round or acquisition
An investor or acquirer will audit your code. Uncontrolled debt lowers valuation—or kills the deal.
The last developer who knows the system is leaving
When the only person who understands the legacy code leaves, every update becomes a gamble. Mapping puts the knowledge back in the team, not in one person’s head.
A technology reaches end of support
PHP 7, an unmaintained framework, an abandoned dependency: once support ends, every vulnerability stays open. Modernising beforehand means choosing your own timeline.
A security incident has raised the alarm
Intrusion, leak, failed audit: legacy becomes a board-level risk. We secure by rebuilding critical modules, not by patching.
Do you have an application slowing down your business? Independent audit in 1 to 3 weeks.
75011 Paris