What migration risks should we plan for, and how do you mitigate them?

Five common risks. One, hidden business logic baked into legacy code (we mitigate with detailed code audits and behavioural shadow testing). Two, undocumented integrations and webhooks (we trace network traffic on the legacy system before cutover). Three, SEO drop from broken URLs (we map every URL and ship a complete 301 redirect set). Four, customer authentication breaking (we migrate password hashes with the right hashing strategy, no forced password resets). Five, third party integrations failing on cutover day (we test every integration on staging with the new application before going live).