Microsoft Partner
Migrating and modernising your IT estate on Microsoft Azure
Migrating is not modernising. The real difficulty is deciding what to keep, move, refactor, rebuild or retire — and in what order.
The decision problem
Six possible trajectories. The difficulty is choosing the right one for each application.
An application estate is never homogeneous: each application carries its own business value, technical debt, regulatory constraints and dependencies. Applying a single trajectory to all of it — migrate everything, or rebuild everything — ignores those differences. The real question is not technical, it is a decision problem: which trajectory for which application, and in what order for the estate as a whole?
Rehost
Move the application to Azure as it stands.
Replatform
Adjust the application for managed services.
Refactor
Restructure the code to leverage the cloud.
Rebuild
Reconstruct the application on a target architecture.
Retire
Decommission what no longer creates value.
Retain
Keep as-is what should stay as-is.
How we intervene
Understand the estate
Before deciding, you need to see. We build with your teams a shared assessment of the application estate: application and dependency mapping, business criticality, technical debt and operating constraints.
- A shared assessment across IT, business and operations
- Business value evaluated application by application
- Technical, regulatory and organisational constraints qualified
Arbitrate the trajectories
Each application receives an argued trajectory — retain, rehost, replatform, refactor, rebuild or retire — within a prioritised roadmap for the estate as a whole.
- Argued scenarios, compared on value, cost and risk
- Architecture choices justified per application, not by principle
- A sequencing that secures dependencies and quick wins
Take it to production
A trajectory is only worth what gets shipped. We ensure continuity between architecture decisions, their technical implementation and operating conditions — including the industrialisation of AI/ML platforms, generative AI and agentic systems on Azure.
- Integration with the existing IT landscape, without operational disruption
- Performance, security and resilience validated in real conditions
- Sustainable operations, tooled and handed over to your teams
Going further
Download our Migration & Modernisation guide
The detail of our approach with Microsoft Azure: the six modernisation trajectories, the arbitration criteria and the framing we propose to decide and prepare implementation.
PDF · 13 pages · French · Delivered by email
Let’s talk about your estate
Where to start? A framing to decide.
Alien6 combines applied research, architecture and engineering to turn your application estate into an operational advantage. The first step is an assessment — not a commitment.
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