We inspect crawl paths, server log forensics, JavaScript rendering, and GA4 and...

https://milosinspiringjournals.talesignal.com/posts/hreflang-validation-tools-are-not-enough-what-should-be-checked-manually

We inspect crawl paths, server log forensics, JavaScript rendering, and GA4 and GSC data, then turn findings into developer-ready specs. After implementation, we monitor fixes for 30 days and flag regressions before they quietly cost traffic.