The Cloud-Native Migration Playbook for Legacy Systems
A practical guide to modernizing monolithic PHP and desktop systems without disrupting operations.
Legacy modernization fails when teams attempt big-bang cutovers. Incremental migration — with parallel running and clear boundaries — is how we de-risk transformation.
The Problem
Monolithic PHP apps, on-prem databases, and Qt desktop tools often power critical business operations. Rewriting everything at once freezes feature work and multiplies risk.
Our Approach
We map dependencies, extract APIs around stable boundaries, and migrate module by module. New services run alongside legacy until parity is proven — then traffic shifts with rollback plans ready.
Infrastructure is codified, environments are reproducible, and monitoring compares old vs. new paths during transition.
Key Takeaways
- Strangle the monolith — extract services incrementally
- Run old and new systems in parallel until parity is verified
- Codify infrastructure early for reproducible environments
- Measure before and after: latency, errors, and operational cost
