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Arthonis
Engineering

Legacy Modernization

Replace or refactor legacy software incrementally — improving reliability, security, and developer velocity while keeping the lights on for the operations that depend on it.

The business problem

An aging system holds the business together but blocks every new initiative. It's risky to change, hard to hire for, and slows everything down.

Our approach

We modernize in safe increments — strangling the old system piece by piece behind stable interfaces — so you get continuous improvement without a risky big-bang rewrite.

Technology:Strangler-fig patternsAPI gatewaysTypeScript / GoContainerizationAutomated testingCI/CD
Sound familiar?

The signs you need this

Change is terrifying

One wrong move could take down core operations.

Nobody understands it

Original authors are gone and docs don't exist.

It blocks innovation

New features take months because of the old core.

Outcomes

What you can expect

Measurable business outcomes — not just deliverables.

Typical timeline

Phased program, first wins in 6–10 weeks

Expected ROI

Modernization unlocks faster delivery and removes the operational risk of an unmaintainable core.

Lower risk than a full rewrite

Continuous improvement with no downtime

Better security and compliance posture

A stack you can actually hire for

Architecture

How it fits together

A reference architecture, tailored to your environment during discovery.

Strangler-fig patterns
API gateways
TypeScript / Go
Containerization
Automated testing
CI/CD

Illustrative architecture · final design produced during discovery

Engagement

How we deliver it

1

System assessment

Map dependencies, risks, and the highest-value targets.

2

Stabilize

Add tests and interfaces to make change safe.

3

Incremental migration

Replace components behind stable boundaries.

4

Decommission

Retire the old system once fully superseded.

FAQ

Common questions

Ready to transform your business?

Book a free strategy session and we'll map the highest-ROI opportunities to automate, build, and scale — no commitment required.