Legacy modernisation

Modernise the system your business depends on

We modernise legacy applications in safe, incremental steps, so you reduce risk and cost without a big-bang rewrite that halts the business.

The problem

The risks of standing still

Legacy systems keep working until they do not, and each year they get harder and more expensive to change.

Security exposure

Unsupported frameworks and servers that no longer receive patches.

Knowledge risk

Only one or two people understand how the system works.

Hard to integrate

New tools cannot connect to the old system.

Slow change

Small changes take weeks and often break something else.

Our approach

Incremental, not big-bang

We replace the system piece by piece behind stable interfaces, so the business keeps running throughout.

  • An honest assessment of what to keep, refactor or replace
  • Tests around existing behaviour before anything changes
  • APIs that let new and old parts work together
  • Gradual migration of features and data
  • Cloud infrastructure with monitoring and backups

Capabilities

What our Legacy Software Modernisation work covers

Pick one capability or combine several. Each is scoped, estimated and delivered with the same engineering standards.

Technical assessment

Code, architecture, infrastructure and risk review with a written roadmap.

Incremental re-architecture

Strangler-pattern replacement of modules behind stable interfaces.

Cloud migration

Move from on-premise or ageing servers to managed cloud infrastructure.

API enablement

Expose legacy functionality through modern APIs.

Data migration

Move and clean data with rehearsed, reversible steps.

Test coverage

Characterisation tests that protect existing behaviour.

How we work

How we deliver Legacy Software Modernisation

  1. Assess

    Understand the system, its users and its risks.

  2. Roadmap

    Agree the order of modernisation by value and risk.

  3. Modernise

    Replace and migrate in small, tested steps.

  4. Retire

    Switch off old components once nothing depends on them.

Technology

Technology we use

Chosen for reliability, maintainability and fit with your existing stack.

Frontend

  • Next.js
  • React
  • TypeScript

Backend

  • Node.js
  • NestJS
  • Python
  • REST
  • GraphQL

Data

  • PostgreSQL
  • Redis
  • Prisma

Cloud

  • AWS
  • Vercel
  • Docker

Migration

  • Docker
  • Terraform
  • AWS migration services

Use cases

Where teams put this to work

Common starting points. Your process will have its own details, which is why every engagement starts with discovery.

  1. 01

    Desktop to web

    An internal desktop application rebuilt as a web application.

  2. 02

    Monolith to services

    A large application split where it genuinely helps.

  3. 03

    On-premise to cloud

    Servers in an office moved to managed cloud infrastructure.

  4. 04

    Unsupported framework upgrade

    Applications moved off end-of-life frameworks and languages.

Industries

Built for operational teams across industries

The patterns carry across sectors. What changes is the data, the systems and the rules, and we learn those first.

  • Finance operations

    Invoice processing, reconciliation support and reporting automation.

  • Logistics & operations

    Tracking, dispatch and exception handling across carriers and internal systems.

  • Healthcare operations

    Scheduling, intake and back-office workflows, designed with privacy requirements in mind.

  • Professional services

    Automated intake, document workflows and client reporting for agencies, consultancies and firms.

  • Education

    Admissions, learning platforms and administrative automation.

FAQ

Legacy Software Modernisation questions

Straight answers to the questions that come up in first calls.

Ask us directly
Should we rewrite our legacy system from scratch?

Rarely all at once. Full rewrites carry high risk because the old system often contains undocumented business rules. An incremental approach usually delivers value sooner and with less risk.

Can you work with old technology?

Yes. We first understand the existing system, add tests around it and then decide what to modernise.

Will there be downtime?

We plan migrations to avoid or minimise downtime, using parallel running and reversible steps where possible.

Related services

Most engagements touch more than one discipline. The same team can take you from strategy to production.

01

Custom Software

Custom software, SaaS products and internal platforms engineered to scale.

  • SaaS products
  • CRM & ERP
  • Dashboards & internal tools
  • APIs & mobile apps
02

SaaS Development

Multi-tenant SaaS products with billing, roles, onboarding and AI features, built to scale.

  • Multi-tenant architecture
  • Subscription billing
  • AI features
  • Scale & security
03

MVP Development

A focused first version of your product, built properly enough to grow from.

  • Scoping workshop
  • Production-grade MVP
  • Launch support
  • Post-launch iteration

Start a project

Tell us what is slowing your team down

Share the workflow, product or team challenge. We will come back with a clear recommendation and next steps.

Intro call · Fixed-scope proposal · No obligation