A redesign that drops your organic traffic by 30% in the weeks after launch is not a successful redesign, even if the new site looks better. This is the most common outcome of a redesign that treats SEO as an afterthought. URLs change without redirects, metadata is reset to defaults, canonical tags are misconfigured, and Google has to re-crawl and re-evaluate every page from scratch.
This is what search engines call SEO-safe migration, though most teams search for it as site migration SEO, seo website migration, or an seo migration checklist. Different name, same underlying process: a systematic sequence that prevents the outcomes above. Every URL is mapped before launch. Redirects are deployed and tested before the DNS switch, and metadata is migrated and verified. A post-launch crawl then confirms the new site is structurally identical to the old one from Google's perspective.