Migration Planning

Migration planning turns a target architecture into safe, sequenced change. The plan should reduce risk incrementally instead of betting the engagement on one large cutover.

Planning inputs

Start with:

Current-state dependency map.
Owners and support paths.
Data classification and compliance scope.
Runtime, network, and identity constraints.
Release and rollback capabilities.
Observability and incident history.
Cost, capacity, and performance assumptions.

Migration phases

Migration plan fields

Every migration plan should include:

Scope and non-goals.
Systems and teams affected.
Target architecture and decision records.
Migration phases and dependencies.
Data movement and reconciliation approach.
Cutover and rollback plan.
Validation and acceptance criteria.
Communication plan.
Freeze windows or change restrictions.

Pilot first

Use a pilot to test the path with limited blast radius. The pilot should exercise deployment, observability, security, rollback, and handoff, not only prove that the new runtime can boot.

Watchouts

Migration plans fail when dependency ownership is unknown.
Big-bang cutovers need stronger rollback than teams usually have.
Replatforming does not automatically fix release, access, or observability problems.
Old paths must be retired or they become permanent operational drag.