Technical SEO problems are far cheaper to prevent during a build than to fix after launch, which is why URL structure, internal linking, and crawlability get planned alongside the sitemap rather than reviewed as an afterthought. We use Screaming Frog and Google Search Console to audit crawlability and indexation, implement schema markup (organization, product, article, FAQ) relevant to the page type, and manage canonical tags and XML sitemaps as standard build output.
For migrations and redesigns specifically, this includes a full URL redirect map (301s) built before launch, since the single most common cause of ranking loss after a redesign is a missed or incomplete redirect plan — something we treat as non-negotiable scope, not an optional line item.