Legacy modernization

Modernize your legacy business software without breaking it

Gradual migration of aging IT systems (legacy Rails, PHP, Joomla, proprietary) to Rails 8 + Hotwire. Your data, your processes, your team — all preserved.

Discuss my legacy system

Track record

Three legacy systems modernized with no downtime

CAPA Business Club

Frozen Rails 5 application, impossible to evolve.

Before

Rails 5, outdated gems, broken dependencies
Membership and event flows scattered
No CI, risky manual deploys

After

Rails 8 + Hotwire, current gems
Centralized membership and events
GitHub Actions CI + Kamal deploys

SOS Médecins Brest (ORIGAMI)

Medical ERP in production since 2012, aging but critical 24/7.

Before

Rails 4 / Ruby 2, eroded security posture
No automated tests, frequent regressions
Software impossible to extend for new processes

After

Migration to Rails 7 then 8, Ruby 3.3
Test coverage, zero-downtime deploys
Rebuilt emergency module, faster reception

SOFIDIAL

15-year-old proprietary ERP disconnected from 30 e-commerce stores.

Before

Frozen ERP, constant manual re-entry
No sync with Shopify/PrestaShop
Reporting impossible to trust

After

Custom Rails ERP, replacing the legacy in stages
Real-time sync across all 30 stores
Consolidated reporting, decisions backed by data

Method

Four steps — no big bang

🔍

01

Audit existing

We review your stack, data and critical processes. We identify what to preserve vs replace.

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02

Migration plan

Broken into shippable batches. Priority on highest-value or highest-risk modules. Realistic schedule.

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03

Strangler pattern

We build the new system in parallel. Switch over module by module. No business interruption.

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04

Progressive cutover

Controlled decommissioning of the legacy. Team training. Documentation and data preserved.

Stack & guarantees

Stack and guarantees

Rails 8 + Hotwire

Modern, mainstream stack with a mature ecosystem. No exotic framework.

Hosted in France

Scaleway / OVH. European data. No US hyperscaler lock-in.

GDPR by design

Anonymization, right to erasure, traceability — built in from day one.

You own the code

You own the source. No vendor lock-in. We leave, it keeps running.

Ready to modernize without breaking everything?

30 minutes to scope your situation. We review your stack, constraints and priorities. You walk away with a progressive migration plan and a budget range.

Discuss my legacy system