Operator context
Longer answer
Stabilisation is the four-to-eight-week window post-launch where the small issues that always surface get found, triaged, and closed. Brands that scope stabilisation as part of the engagement consistently produce better outcomes than brands that treat launch as the endpoint and discover stabilisation needs reactively after the agency engagement has ended.
Week 1 is dominated by the password-reset spike and the immediate customer-service load from app-flow changes. Support volumes run 3-10x normal. Brands that staffed for this absorb the volume; brands that did not generate queue backlog that compounds into negative reviews. The work is operational, owned by the customer-service team rather than engineering.
Weeks 2-4 are the redirect-map gap closure window. Search Console surfaces the long-tail 404s that the initial map missed; each one needs disposition (add a redirect or confirm the URL is retired). The work is operator-driven, owned by the SEO workstream rather than engineering. Brands that monitor daily catch the gaps as they surface; brands that monitor weekly let traffic drop compound.
Weeks 4-8 cover the first post-migration month-end close (where tax data discrepancies surface to finance), the attribution stabilisation (where marketing analytics finally produce comparable numbers), and the residual customer-service tickets from the in-flight RMAs and subscription cutover edge cases. Each of these has its own owner; the engagement-level discipline is making sure each one has named ownership.
For brands extending the agency engagement through stabilisation (which is the recommended pattern), the agency handles incident triage and engineering response for issues that need code changes. For brands ending the agency engagement at launch, the internal team owns stabilisation. The latter pattern works but requires explicit internal capacity allocation that brands often underestimate.