What it covers
- Strangler pattern — Route by route or module by module, the new system takes traffic while the old one stays ready to take it back.
- Front-end rebuilds — Next.js / React with TypeScript and Tailwind; server rendering where SEO matters, client interactivity where it doesn't.
- Back-end re-platforming — Node.js, .NET or Python services with migrations, indexes, idempotent jobs and audit trails done right.
- Feature flags — Every rebuilt module behind a flag, so a rollback is a toggle rather than a deploy.
How we work
Characterisation tests pin the old behaviour first; the rebuilt module ships only when its output matches on real traffic.
