Legacy Migration: Refactoring

Modernize legacy systems. Includes Strangler Fig Pattern, Anti-Corruption Layers, Zero-Downtime Deployment and Database Refactoring — delivered by IQDigital's…

Legacy migration moves a business off outdated systems onto modern architecture without stopping the business. IQDigital migrates incrementally with the strangler fig pattern, uses an anti-corruption layer between old and new systems, and protects data integrity with automated migration scripts and dual-write strategies.

Who it's for

  • Companies whose legacy codebase slows down every new feature
  • Teams that cannot afford downtime during a rewrite
  • Organisations with old databases that block modern tooling

What is legacy migration?

Technical debt is interest paid on the past. IQDigital specializes in rescuing businesses from legacy codebases that stifle innovation. We do not just 'rewrite' code; we execute strategic 'Legacy Migrations.' We assess your monolithic, outdated systems and map a path to modern, microservices-based architectures without causing business downtime.

How the strangler fig pattern works

We employ the 'Strangler Fig Pattern.' Instead of a risky 'Big Bang' rewrite, we gradually replace specific functionalities of the old system with new, modern services. Over time, the new system 'strangles' the old one until the legacy code can be safely decommissioned. We introduce an 'Anti-Corruption Layer' (ACL) to translate between the new and old systems during the transition.

How we protect your data

We focus on 'Data Integrity.' Migrating databases is high-risk; we use automated scripts and dual-write strategies to ensure zero data loss. We refactor code to improve readability, maintainability, and performance. We turn your legacy liability into a modern asset, unlocking velocity and scalability that was previously impossible.

What's included

  • Strangler Fig Pattern — Incremental, low-risk migration strategy.
  • Anti-Corruption Layers — Bridging new and old systems safely.
  • Zero-Downtime Deployment — Maintaining uptime during transition.
  • Database Refactoring — Normalizing and optimizing old data structures.

How an engagement runs

  1. Diagnose (Week 1) — We find the money before we spend yours.
  2. Build (2–8 weeks) — Senior engineers. Your stack. Weekly proof.
  3. Launch (Go-live) — Released against a baseline, not a hope.
  4. Compound (Ongoing) — The second month should beat the first.

How the work is scoped

  • Engagement: Fixed-scope project

Questions about Legacy Migration

Why not rewrite the system from scratch?

A "big bang" rewrite is risky: everything changes at once. We replace functionality piece by piece, so the business keeps running and each step can be verified.

What is the strangler fig pattern?

New services gradually take over specific functions of the old system until the legacy code can be safely decommissioned.

What is an anti-corruption layer?

A translation layer between the old and new systems, so the new architecture is not shaped by the old one's quirks during the transition.

Will there be downtime?

Migrations are planned as zero-downtime deployments, keeping the system available during the transition.

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What IQDigital provides

IQDigital designs, deploys and operates production AI and growth systems for European businesses. Engagements are founder-led, integration-aware and built around measurable operational or commercial outcomes.

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