Legacy Modernization
Legacy code isn't a burden. It's an asset, if migrated right.
The same picture shows up in company after company: an 8-10 year old project carrying every business process. The framework is end-of-life, security patches have stopped, adding a feature takes months, and developers who know the stack are getting harder to find. Nobody touches the system because it works; because nobody touches it, it gets more expensive every year.
Our approach is not a rewrite from scratch. The business rules inside your current system are years of accumulated knowledge and the most valuable part of it; so we first lock the existing behaviour down with automated tests, then migrate the system module by module to current technology.
What you end up with is a system deployed safely through CI/CD, scaling in the cloud, and documented so your own team can own it.
- .NET Framework 4.x.NET 9
- PHP 5 / 7PHP 8 · Node.js
- Java 6 / 8Java 21
- AngularJS · jQueryReact · Next.js
- WinForms · WebFormsWeb-based UI
- SQL Server 2008 · MySQL 5PostgreSQL · Cloud database
- On-prem serversDocker · Kubernetes · Cloud
From code analysis to go-live, four phases without downtime.
Discovery & Code Analysis
We inventory and inspect the existing codebase, database, integrations and infrastructure. Which modules are critical, which are dead code, which dependencies are end-of-life: everything goes onto a risk map. If there's no documentation, we produce the first version in this phase.
Target Architecture & Migration Plan
We select the target stack that fits your business and your team's skills. We plan which module moves in which order, how old and new run in parallel, and how data is migrated.
Incremental Migration
We migrate the system module by module. Each module's current behaviour is captured in automated tests first, then rebuilt on the new stack and run through the same tests. The legacy system keeps running until the migrated module goes live; users don't notice the switch.
Go-Live & Knowledge Transfer
We run the final cutover in a planned, reversible way. We set up monitoring and alerting, and hand the new system over to your team with training. The legacy infrastructure is safely decommissioned. If you wish, we continue with maintenance and development support.
WHAT SETS US APART
Not a rewrite. The right migration.
The common approach.
- The "let's rewrite it from scratch" promise
- Big bang cutover, long outage
- Years of business rules lost along the way
- Never-ending project, drifting budget
- Undocumented, ownerless handover
The Avva Mobile approach.
- Incremental migration that preserves existing business logic
- Old and new in parallel; no downtime
- Behaviour verified by automated tests
- Fixed-scope phases, clear budget
- Documented handover your team can own
A process proven in the field.
Applied across different technology stacks and industries, this process is repeatable because the method is independent of the technology: tests first, then module-by-module migration.
If this picture looks familiar, you're in the right place.
Our legacy modernization service is designed for companies that run their business on an aging system and have started to feel its cost.
- Business applications running on legacy .NET Framework, PHP 5/7, Java 6/8 or VB.NET
- Front ends stuck on AngularJS, jQuery or outdated Angular/React versions
- Systems whose original team has left, with no documentation, that nobody dares to touch
- Projects running on end-of-life servers, databases or operating systems and carrying security risk
- Companies with growth plans whose current infrastructure won't scale
Questions before you decide.
Rarely. Most from-scratch rewrites either never finish or lose years of business rules along the way. The behaviour in your current system, shaped by years of customer feedback, is your most valuable asset. We lock that behaviour down with tests and migrate it incrementally; in the exceptional cases where a rewrite is the right call, we say so plainly at the end of the analysis.
No. The old and new systems run in parallel throughout the migration; each module goes live when it's ready and can be rolled back. Users usually don't notice the switch. The final cutover is planned, short and backed by a rollback plan.
The pairings we see most often are in the migration map above. If your technology isn't listed, we assess it together during discovery; the method is independent of the technology.
Yes; this is the situation we encounter most often. In the discovery phase we analyse the code, the database and usage logs to reverse-engineer what the system does, and we produce the first documentation ourselves.
Duration depends on the size of the system; small applications take a few months, large monoliths are split into phases. At the end of discovery we present a module-based, fixed-scope, phased plan with a clear budget. Each phase delivers value on its own; you can pause or continue the project at any phase.
