K by Koro

Field notes from the build.

Debugging post-mortems, infrastructure deep dives, and hard-won lessons from shipping web systems that have to actually stay up.

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Product Kally₂ Booking AI

Announcing Kally₂: Booking, Owned End to End

Kally₂ is Koro's in-house booking and scheduling platform — real-time availability, automated confirmations, and full data ownership, with no third-party dependency. Here's why we built it and where our AI receptionist plugs in.

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August 7, 20265 min read

DNS Web Infrastructure Debugging

DNS_PROBE_FINISHED_NXDOMAIN: When Your Two Nameservers Disagree

A site that loaded on some devices and died on others. It wasn't propagation, it wasn't a registrar hold — it was two authoritative nameservers quietly serving different versions of the same zone. Here's how to catch it with dig.

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