Service · 05 / 06
Move legacy applications to a modern stack for better speed, quality, and feature velocity.

Application Modernization

Legacy stacks quietly tax everything: every feature ships slower, every hire takes longer to onboard, every dependency is a risk. Modernization is not a rewrite for its own sake. We move applications to a modern stack incrementally, so you gain speed, quality, and feature velocity without a high-risk big-bang rewrite.

Modernization assessmentIncremental migrationFramework & stack upgradePerformance & quality upliftArchitecture refactoring
See related case study
Typical outcomes
Incremental
No big-bang rewrite

We migrate in shippable slices so the app keeps running and value lands continuously, not at the end.

Faster
Feature velocity

A modern stack and cleaner architecture remove the friction that slows every change on legacy code.

Lower
Maintenance & risk

Supported frameworks, fewer security holes, and a codebase new engineers can actually onboard into.

What's included

Assessment

  • Codebase, architecture, and dependency audit
  • Risk and technical-debt mapping
  • Target-state architecture and stack recommendation
  • Incremental migration roadmap with shippable milestones
  • Effort, sequencing, and risk estimate

Migration

  • Framework and language/runtime upgrades
  • Strangler-fig and incremental migration patterns
  • Data and schema migration where needed
  • API and integration modernization
  • Parallel-run and safe cutover strategy

Quality uplift

  • Test coverage added around legacy and migrated code
  • Performance profiling and optimisation
  • Dependency and security hardening
  • CI/CD and quality gates for the modernized codebase

Enablement

  • Architecture and decision documentation
  • Knowledge transfer to your engineers
  • AI-assisted refactoring patterns for the new stack
  • Maintenance and ownership handover
Engagement shapes

Diagnostic

30 minutes + written summary

Pressure-test your modernization options. We return the highest-value targets, the biggest risks, and a pragmatic sequencing plan, not a rip-and-replace pitch.

Hands-on Demo

60-90 minutes

Walk through an incremental modernization approach on a representative slice of your app, showing the migration pattern and trade-offs for your stack.

Sprint

4-8 weeks

Hands-on modernization of a scoped slice: assessment, target architecture, and a first shippable migration milestone with tests and CI in place.

Embedded Retainer

Ongoing, monthly · T&M

A dedicated senior consultant drives the migration alongside your team milestone by milestone, under your engineering leadership. Monthly time-and-materials.

Who it's for

Best fit

  • Teams on an aging framework or runtime that slows every change
  • Products where onboarding new engineers takes too long
  • Organisations accumulating security and dependency risk on legacy code
  • Teams that want incremental modernization, not a risky full rewrite

Not a fit

  • Greenfield projects with no legacy to modernize
  • Teams seeking a big-bang rewrite with no incremental safety net
  • Apps slated for retirement where modernization adds no value
FAQ
01
Do you do full rewrites?

Rarely, and only when the evidence clearly supports it. Big-bang rewrites are high-risk and often stall. We default to incremental modernization, the strangler-fig pattern and similar, so the app keeps shipping value while it moves to the new stack.

02
How do you avoid breaking things during migration?

We add test coverage around the code before we change it, migrate in small shippable slices, and use parallel-run and safe-cutover strategies. Every milestone is releasable, so risk stays bounded and reversible.

03
How do you decide the target stack?

Based on your team's skills, your existing ecosystem, hiring market, and the application's actual requirements, not fashion. The assessment produces a target-state recommendation you can challenge before any code moves.

04
Can AI tooling speed up the migration?

Yes. AI-assisted refactoring, test generation, and code translation can accelerate large parts of a migration, particularly mechanical changes. We apply it where it helps and keep humans in control of architecture and review.

Ready to talk about app modernization? Start with a Diagnostic.

Or email alex@vgtc.io