Amaryllis Solutions
EXPERTISE / 03

Legacy → AI-ready Modernization

Prepare legacy and .NET systems for AI with APIs, controlled data access, testing and incremental modernization. A full rewrite is not always necessary.

What it means for your business

AI-ready modernization prepares an existing system for controlled AI use. It makes data accessible under explicit rules, business operations callable through stable interfaces and changes testable. Updating a language or platform version alone does not make a system ready for agents.

When it makes sense

When business logic has worked for years but data is hard to access, interfaces are closed and limited test coverage makes changes risky. AI adoption often first needs accessible data, clear contracts and manageable changes. Replacing the entire system is not always necessary.

Example workflows

Illustrative workflows. The actual scope and system access are agreed for each project.

Closed internal application

Add a limited API for the required read operations. Start with retrieval or a recommendation workflow; enable writes after agreeing on rules and completing validation.

.NET Framework monolith

Establish a boundary around one workflow and incrementally move selected components. A new integration layer can support AI features while the remaining business logic continues to operate.

Fragmented business data

Identify source owners, identifiers and quality rules. Resolve critical inconsistencies and document refresh and access policies. AI connects to agreed information rather than concealing data problems.

Choosing an approach

Choosing an approach
ApproachHow it worksBest suited to
API wrapperKeeps the existing system and adds a controlled interface.When the core is stable and integration points are accessible.
Incremental modernizationReplaces capabilities in stages behind a stable boundary.When workflows can be isolated and compatibility verified.
Component rewriteRebuilds a selected part.When its limitations cannot be addressed acceptably.

Controls and reliability

Zero downtime cannot be promised without reviewing the architecture and constraints. We first define change windows, backup and recovery needs, data reconciliation and rollback conditions. Existing-behavior tests help reveal undocumented dependencies. For two-way integration, the source of truth and update order must be explicit to prevent divergence and duplicate operations.

The first pilot

We map dependencies and select one valuable workflow. Data and operations are exposed through an agreed interface. Tests capture existing behavior before selected components change. Platform updates, data improvements and AI implementation are separated so each stage has an independently verifiable outcome.

Assessment comes first: architecture, critical workflows, interfaces, data quality and tests. We then select a small vertical slice from a user request to the underlying data. Build the interface, validate compatibility and connect one AI feature. Findings refine the roadmap. The Strangler Fig pattern supports gradual replacement, but depends on being able to control routing and capability boundaries.

Scope of work

  • Architecture and data readiness assessment
  • API layers for existing systems
  • Incremental component modernization
  • Tests, observability and rollback planning

What you receive

A dependency and risk map, AI readiness assessment, prioritized modernization plan and an agreed first working slice. Depending on scope, deliverables include API wrappers, updated modules, tests, monitoring and transition instructions. Rollback planning and data reconciliation inform the design.

What we measure

Data readiness
Availability, freshness, ownership and enforceable access rules.
Interface stability
Documented contracts, test environments and failure handling.
Change safety
Critical workflow coverage, data reconciliation and a verified rollback procedure.
Operational readiness
Diagnostics, accountable owners and support arrangements.

Questions and answers

Do we need to rewrite the whole system for AI?

Not necessarily. A limited API, data improvements and an isolated workflow are often sufficient. The choice depends on the system’s condition and the new use case.

Can AI connect to .NET Framework?

In many cases, through an API or a separate integration service. Assessment checks compatibility, environment constraints and the maintainability of the specific application.

What does an AI readiness assessment cover?

Architecture, data access, APIs, permissions, tests, observability and the ability to change the system safely. The output is a list of blockers and sequenced work with explicit dependencies.

Do you guarantee modernization without downtime?

Transition requirements depend on the system. Acceptable interruptions, switching, validation and rollback are agreed before implementation. A zero-downtime promise without assessment would be inappropriate.

How should we select the first modernization slice?

Choose a workflow with measurable value, a limited number of dependencies and accessible data. It should validate the architectural approach without creating excessive risk for critical operations.

Prepare for the first conversation

Describe the workflow, current systems and expected outcome. The first discussion identifies discovery questions and the boundaries of a possible pilot.

Open the project brief →
LET'S BUILD SOMETHING THAT WORKS.

Let's work through
your challenge.

A new product, a complex integration or a system ready for its next chapter. Let's start with a conversation.

contact@amaryllis.by ↗
42-317 Kalvariyskaya St.,
Minsk, 220073, Belarus

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