Legacy system modernization without rewriting from scratch

TL;DRMagusoft modernizes aging web apps, internal tools, and CMS-driven sites by replacing them piece by piece — usually moving to Next.js, TypeScript, and PostgreSQL — without disrupting the business.

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The problem

Legacy systems are slow, expensive to change, and impossible to hire for. But ripping them out in one go almost always overruns and breaks production.

How we help

We use the strangler-fig pattern — modernize one route, one feature, one workflow at a time — until the old system is fully replaced. The business keeps running the entire time.

What you get

  • Architecture audit and modernization roadmap
  • Strangler-fig integration layer
  • Incremental migration of pages and APIs
  • Test coverage where there was none
  • Performance and Core Web Vitals improvements
  • Decommissioning plan for the legacy system
  • Hosting, SLA-backed support, and ongoing maintenance of the new system

Our process

  1. 1

    Audit

    A focused deep dive into the legacy codebase, infrastructure, and traffic patterns.

  2. 2

    Roadmap

    We sequence the migration by business value and risk, not by tech debt alphabetical order.

  3. 3

    Strangle

    We route one feature at a time through the new stack while the old system keeps running.

  4. 4

    Migrate

    Iteratively replace pages, APIs, and admin panels until the legacy system is empty.

  5. 5

    Decommission

    Final cutover, data archive, and turn off the legacy infrastructure.

  6. 6

    Operate

    We run the modernized system under an SLA-backed agreement — hosting, monitoring, patches, and continued roadmap work.

Tech stack

We build on a modern, well-supported stack and then operate it for you — hosting, monitoring, patches, and continued development under an SLA-backed agreement.

Next.jsReactTypeScriptNode.jsPostgreSQLDockerVercel

Frequently asked questions

Why not just rewrite the whole system at once?
Big-bang rewrites have a poor track record. They overrun, freeze the business for months, and ship a worse product than the original because no one remembers all the edge cases. Incremental migration ships value continuously and de-risks every step.
How long does a modernization project take?
It depends on system size. A small back-office app might take 8–12 weeks; a multi-module ERP-replacement can run 9–18 months in phases. The audit produces a phased roadmap with budget per phase.
Can you work alongside our internal team?
Yes. Most modernization engagements run with a small Magusoft squad embedded with your engineers, or as a dedicated team that coordinates closely with internal product owners.
What if the legacy system has no documentation?
That is the normal case. The audit phase reads the code, traces the traffic, and interviews the people who still remember why it works. We rebuild documentation as part of the migration.
Do you migrate the database too?
When it makes sense. Sometimes we keep the legacy database and add a new app layer; sometimes we move to PostgreSQL during migration. The roadmap calls it explicitly.

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