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Software Modernisation

Modernise legacy software without stopping the business

Ageing desktop systems, outdated frameworks and fragile codebases — we replace or upgrade them in stages, keeping operations running while the new system proves itself.

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How do you modernise a legacy application safely?

Safe modernisation happens in stages. ImliStack first audits the existing system and its data, then replaces it piece by piece — starting with shared foundations such as data models, forms and reports — and runs old and new side by side until each module is verified. This avoids risky 'big bang' rewrites.

Is this for you

Where we usually help

If any of these sound familiar, a short call is the fastest way to find out whether we are the right fit.

  • A desktop or on-premise system limits remote work and growth
  • Framework versions are years out of date and upgrades keep slipping
  • Pages are slow, releases break things and nobody wants to touch the code
  • Knowledge of the system sits with one person

What we deliver

Software Modernisation capabilities

01

Legacy-to-web replacement

Desktop or on-premise systems rebuilt as secure, multi-tenant web platforms.

02

Framework & dependency upgrades

Angular, React, Node.js and Android upgrades planned to avoid regressions.

03

Refactoring & architecture

Untangle modules, introduce clear boundaries and add tests where risk is highest.

04

Performance optimisation

Query tuning, caching, background processing and front-end payload reduction.

05

Data migration

Scripted, repeatable migrations with validation and rollback plans.

06

Stabilisation

Error tracking, crash fixes and release discipline for systems that keep breaking.

How we work

A delivery approach you can follow

Written plans, visible progress and decisions recorded as we go — so nothing depends on memory.

  1. Audit

    Understand the code, data, users and failure modes before proposing change.

  2. Plan in stages

    Sequence modules so value ships early and risk stays contained.

  3. Run in parallel

    Old and new systems side by side until each module is verified.

  4. Retire

    Switch over, migrate the remaining data and decommission safely.

Technology

Tools we use for software modernisation

We choose tools for your constraints, not our habits. See the full technology overview.

  • Node.js
  • TypeScript
  • Angular
  • React
  • MySQL
  • PostgreSQL
  • Redis
  • Sequelize
  • Zod
  • Kotlin
  • Java

Proof, not promises

A multi-tenant textile ERP replacing a desktop accounting system, built in phases around an append-only stock ledger.

See modernisation work

FAQ

Software Modernisation: common questions

Should we rewrite from scratch or refactor?

Most systems are better refactored or replaced in stages. A full rewrite only makes sense when the platform itself is the blocker. The Technical Architecture & Codebase Audit gives you a recommendation with the reasoning behind it.

Can the business keep running during modernisation?

Yes — that is the point of a staged approach. Modules move one at a time, with the old system available until the new one is verified.

How long does modernisation take?

It depends on system size and data complexity. After an audit we provide a phased plan with indicative durations for each stage rather than a single guessed date.

Related services

All services

Next step

Have a product to build or a system to fix?

Tell us what you are working on. You will get a considered reply from an engineer — with questions, a suggested approach or an honest “we are not the right fit”.

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