Legacy Application Modernization
Aging line-of-business systems, from Access databases and VB6 programs to classic ASP, old PHP and .NET Framework apps, rehosted, refactored or replaced on evidence, with the data moved intact and the business running throughout.
Overview
The old system works. That is exactly what makes replacing it risky.
Every organization has one: the Access database that runs scheduling, the VB6 program only one person understands, the web application on a server and framework version nobody can patch any more. It still works, so it never gets replaced, until the author retires, the server fails, an auditor flags it, or a browser update breaks it overnight.
Modernization does not have to mean a big-bang rewrite, and usually should not. We start by assessing what the system actually does, including the business rules nobody wrote down, and recommend the least risky path: move it to supported infrastructure, refactor it in place, rebuild it piece by piece beside the old one, or replace it with a product that now does the job. Data migration is its own phase, rehearsed before cutover, and the old system stays available until the new one has proved itself.
Capabilities
What's included
- Application and code assessmentWhat the system does, how it is built, who depends on it, and where the undocumented business rules live, written up as a report you own.
- Rehost and replatformThe application moved to supported servers, a current framework version or the cloud when the code is sound but the platform is not.
- Incremental rebuildNew modules replace old ones a piece at a time behind the same front door, so the business never depends on a single cutover weekend.
- Access and spreadsheet replacementMulti-user web applications with proper permissions and backups, replacing databases and workbooks that outgrew a shared drive.
- Framework and runtime upgradesApplications moved off end-of-life PHP, Laravel, Rails and .NET Framework versions onto supported releases.
- Data migration and reconciliationData profiled, cleaned, migrated by script and reconciled with counts and totals, rehearsed at full volume before the real cutover.
How We Work
Our approach
- 01
Assess
Code, data, integrations and the rules users rely on, documented, with risks ranked.
- 02
Choose the path
Rehost, refactor, rebuild or replace, compared on cost, risk and time, with a recommendation in writing.
- 03
Modernize in phases
Delivered in stages that each go live, so value arrives early and risk stays small.
- 04
Cut over & retire
Rehearsed migration, parallel running where needed, then the old system archived and retired.
Outcomes
What teams see
Practised at full volume before the real one.
Available until the replacement has proved itself.
Scoped and priced before any build commitment.
Common Questions
Questions we get asked
Should we rewrite the system from scratch?
Rarely all at once. Full rewrites take longer than planned, and the old system's undocumented rules tend to surface only after go-live. More often the safer route is to move the application onto supported infrastructure first, then replace it piece by piece while it keeps running. Sometimes the honest answer is that an off-the-shelf product now does the job, and we will say so.
The person who built our system has left. Can you work with that?
Yes, that is the usual situation. We read the code, the database and whatever documentation exists, interview the people who use the system every day, and write down what it actually does, including the business rules that only exist in the code. That document is yours whatever you decide next, and it removes the single-person dependency on its own.
How do you avoid losing data during the move?
Migration is planned as its own phase. We profile the existing data to find duplicates, broken records and odd formats, write repeatable migration scripts, and rehearse the full migration at production volume more than once. Each run is reconciled with record counts and financial totals, and the cutover only happens when the numbers match. The old data is archived, not deleted.
Can the business keep working while you modernize?
That is the point of doing it in phases. The existing system stays in service while new parts are built and tested beside it, and each cutover is scheduled for a quiet period with a tested way back. Users are trained before a change reaches them, and nothing is switched off until the replacement has run in production long enough to trust.
Running on a system
nobody can support?
From scoping to deployment — get a consolidated quote and a clear path through the right contract vehicle.