Practice — Legacy Modernization
Retire the system that everyone is afraid to touch — without stopping the business.
Summary
Every serious business has one: a legacy system that runs a critical piece of the operation, is impossible to change safely, and blocks every new initiative that touches it. Big-bang rewrites of these systems fail more often than they succeed. What works is the strangler pattern — new capability built alongside the old, traffic shifted in slices, the old system retired only when the new one has demonstrably taken over.
Polyric specialises in exactly this: getting the honest inventory of what the legacy actually does, designing the modern target, and executing the migration in production-safe increments while the business keeps running.
Who it's for —CTOs, VPs of Engineering, and product leaders whose roadmap is blocked by a legacy system nobody wants to touch.
Outcomes
- ▸Legacy retired without an outage
- ▸Reconciled data migration with audit trail
- ▸In-house team owning the new stack
What we deliver
Business capabilities, not line items.
Each deliverable is a business outcome you can name — and measure — not a stack of hours.
Legacy audit & risk assessment
An honest, written inventory of what the legacy system does, what it costs, and where the migration risks actually sit.
Target architecture design
A modern target that fits the business — not a fashionable rewrite that reintroduces the same failure modes in TypeScript.
Strangler-pattern migration
New capability built alongside the old, traffic shifted incrementally, and rollback available at every step.
Data migration & reconciliation
Historical data migrated with reconciled totals, not lost or silently transformed. Financial and regulatory data gets bit-for-bit provenance.
Team ramp-up on the new stack
Your engineers pair with ours through the migration so ownership transfers cleanly at the end, not just the code.
How we deliver
The tech, kept honest.
The stack is a means, not the sell. We pick tools the team taking this over can hire for and maintain.
- Strangler-fig migration pattern
- Postgres + typed API replacement layer
- Event bridges to legacy systems
- Reconciliation & shadow-traffic tooling
Where this shows up
Industries we run this in.
Retail & Consumer Goods
Commerce platforms, order and inventory systems, and store operations tooling that hold up through peak season.
ITES
Agent tooling, workflow automation, and SLA reporting for IT-enabled services and business-process operations.
Public Sector
Citizen-facing services, case management, and data platforms delivered to accessibility and transparency standards.
FAQ