Legacy Software Modernisation

Bringing software that still does its job into a state where it can be maintained, secured, extended and trusted again.

Starting from: £2,300
Category: Software Development
Clients: Business, organisation & private
Delivered: UK & EU, remotely

Legacy Software Modernisation at Veloriq Software — From£2,300

What this service is

Old software is not automatically bad software. The question is whether it can still be changed safely — and what it would take to make that true.

Legacy modernisation covers the work needed to make existing software maintainable again: upgrading platforms and frameworks that are out of support, refactoring code that has become difficult to change safely, replacing an interface that staff struggle with, improving performance, and migrating away from technology that is no longer viable.

We begin with an assessment rather than a proposal to rewrite. Full rewrites are expensive, slow, and carry a well-documented risk of reproducing old problems while losing behaviour nobody remembered to specify. Where a rewrite is genuinely the right answer we will say so, but a staged modernisation usually delivers value sooner and with less exposure.

The situations that bring people to this service

If more than two of these describe your organisation, the conversation is usually worth having.

Framework or runtime past end of support, with unpatched vulnerabilitiesSupported versions with a documented upgrade route and a security posture you can defend

Small changes take weeks and frequently break something elseTest coverage on core behaviour and a structure that allows contained change

One supplier or one person is the only route to any changeDocumented, conventional code that a competent team can pick up

An interface staff avoid or need lengthy training to useA modernised interface designed around present-day expectations

Slow performance accepted as a fact of lifeBottlenecks measured and addressed at the source

The system cannot integrate with anything modernA documented API layer opening it up without destabilising it

Common use cases

Where this work typically applies

Practical examples rather than industry categories — the pattern matters more than the sector.

01
Out-of-support platform
A system running on a framework or runtime that no longer receives security updates, where inaction is itself the risk.
02
Supplier dependency
Software only one party can change, where the priority is documentation, tests and transferability.
03
Interface no longer fit for purpose
Sound logic behind a front end that predates mobile devices and current accessibility expectations.
04
Performance degradation
A system that worked well at a tenth of today’s data volume and now struggles.
05
Integration blocked
An older system that must exchange data with new tools but offers no interface to do so.
06
Staged replacement
Gradually moving functionality out of an old system into new components, without a single high-risk cutover.

What we can deliver

Deliverables for this service

Not every engagement includes every item. Your quotation lists exactly what is in scope and what is not.

01
Technical assessment report
Architecture, dependencies, security exposure, test coverage, code health and operational risk, written for both technical and non-technical readers.
02
Costed options appraisal
Maintain, modernise in stages, replace incrementally or rebuild — each with indicative cost, timescale, risk and consequence of doing nothing.
03
Dependency and platform upgrade
Runtime, framework and library versions brought to supported releases, with regressions identified and resolved.
04
Refactoring of critical areas
Targeted restructuring of the parts that change most often or carry most risk, rather than indiscriminate rewriting.
05
Automated test coverage
Tests added around core behaviour first, so that subsequent change can be made with evidence rather than hope.
06
Interface modernisation
Updated, responsive, accessible interface applied without discarding the business logic underneath.
07
Performance work
Profiling, database and query optimisation, caching and resource handling, measured before and after.
08
API layer for integration
A documented interface placed in front of the existing system so modern tools can use it safely.

Our approach

How we work on this specifically

01
Assess before proposing
We read the code, the data and the deployment before recommending anything. A modernisation plan written without that is guesswork.
02
Establish a safety net first
Tests around current behaviour come before restructuring. Without them, refactoring is simply change with extra confidence.
03
Work in reversible steps
Each stage is deployable and can be stopped without leaving the system half-migrated. That protects you if priorities change.
04
Preserve behaviour deliberately
Undocumented behaviour is often load-bearing. We identify it and decide explicitly whether to keep it, rather than losing it by accident.
05
Strangle rather than replace
Where full replacement is the destination, we route functionality piece by piece to new components while the old system keeps running.

Technical capabilities

What we bring to this work

Capability relevant to this service. We do not list technology we would not actually recommend.

Assessment

Codebase and architecture review
Dependency and vulnerability audit
Data model and quality review
Performance profiling
Operational and hosting review
Costed options appraisal

Modernisation

Framework and runtime upgrades
Targeted refactoring
Automated test introduction
Interface rebuild and accessibility
Database optimisation and migration
Containerisation and deployment automation

Transition

Incremental replacement patterns
API layer over legacy systems
Parallel running and comparison
Data migration and verification
Rollback planning
Documentation and knowledge transfer

Project stages

The sequence from enquiry to delivery

Each stage has a defined output and a review point. You always know where the work stands.

Assess

Code, data, dependencies, hosting and operational risk reviewed and reported.

Options

Costed routes presented with risk and consequence, so the decision is yours and informed.

Stabilise

Tests, monitoring and urgent security work put in place before structural change begins.

Modernise

Upgrades, refactoring and interface work delivered in reversible, deployable stages.

Verify

Parallel running and comparison against the previous behaviour before retirement of the old path.

Hand over

Documentation, updated deployment process and knowledge transfer to your team.

Starting price

From

£2,300

Final pricing depends on project scope, complexity, integrations, data migration, requirements and delivery timeframe. We quote a fixed figure against a written scope.

Request a quote +44 7848 457256

Delivery & engagement model

Indicative timescales

Assessment and options appraisal: Typically 2 to 3 weeks
Targeted modernisation of a defined area: Typically 6 to 12 weeks
Staged modernisation programme: Typically 4 to 9 months in phases

Many clients begin with the assessment alone. It is a self-contained deliverable, priced separately, and you are free to act on it with any supplier.

Who this service is for

Typical clients for this work

We work with B2B companies, organisations and private clients. The requirement matters more than the size of the buyer.

Businesses

Organisations dependent on software that is difficult to change
Companies facing an end-of-support deadline
Businesses whose system cannot integrate with modern tools
Firms wanting to reduce dependence on a single supplier

Organisations

Bodies with long-lived systems holding important records
Providers with accreditation or security review requirements
Organisations planning a phased system replacement

Private clients

Individuals who own a product built years ago
Professionals reliant on a bespoke tool that has aged

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Service FAQ

Questions we are asked about this service

See all frequently asked questions

That is precisely what the assessment answers. Rewriting is justified when the platform is genuinely dead, when the business process has changed beyond recognition, or when the code cannot be made safe at acceptable cost. Otherwise staged modernisation is usually faster, cheaper and materially less risky.

Sometimes, but the options narrow considerably. Without source code the realistic routes are integration around the system, data extraction, and planned replacement. We will tell you honestly what is and is not possible rather than encouraging you to hope.

Yes. Work is staged so the system remains in service throughout, with changes released in small increments and a rollback route for each. Where a brief planned outage is unavoidable, it is agreed and scheduled in advance.

Yes, and it is common. We can carry out an independent assessment, take a defined workstream, or provide review and mentoring. Where an existing supplier is involved we prefer arrangements that are transparent to everyone.

By capturing current behaviour in automated tests before changing anything, running old and new in parallel on real data where feasible, and involving people who use the system daily. It is the part of modernisation most often skipped, and the cause of most modernisation failures.

Have a project in mind?

Tell us what you are trying to achieve and we will come back with a clear view of the scope, the approach and the cost.

Start a Project Call +44 7848 457256