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Legacy Modernization

Migrate without burning the house down

Incremental migration from legacy systems to modern architecture. No big-bang rewrites. Strangler fig pattern, zero-downtime cutovers, and reversible steps that keep your business running.

The Challenge

01

The rewrite trap

Full rewrites sound clean but take 2-3x longer than estimated, and the business can't wait. Meanwhile, the legacy system keeps accumulating changes that the new system needs to catch up to.

02

Undocumented business logic

The legacy system contains years of business rules that nobody remembers writing. Requirements live in code, not documentation. Migrating means reverse-engineering intent from implementation.

03

Zero tolerance for downtime

The business runs on this system today. Any migration strategy that requires downtime, data freezes, or parallel operation periods is a non-starter for revenue-critical systems.

Our Approach

Strangler fig pattern

Build new services alongside the old. Route traffic gradually. Retire legacy components only after the replacement is proven in production. Every step is reversible.

Comprehensive audit first

We read every line before we change any. Map dependencies, document business rules, identify the riskiest components. The audit pays for itself in avoided surprises.

Zero-downtime cutover

Blue-green deployments, feature flags, and dual-write patterns that let you switch traffic without downtime. Rollback is always one flag flip away.

What's Included

01System audit & migration strategy
02Incremental migration execution
03Database restructuring & migration
04Zero-downtime deployment strategy
05Post-migration validation & monitoring
06Rollback procedures & documentation

Expertise

  • Legacy system modernization
  • Legacy migration services
  • Application modernization
  • System modernization agency
  • Legacy code migration
  • Monolith to microservices
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Ready to build?Let's scope it out.

filip@ipsilon.agency