How We Built Our Own DNS Server

We wrote a production DNS server in ~1000 lines of Go, migrated thousands of records off Hetzner DNS, and dropped propagation time from "up to 90 minutes" to a few seconds. It uses the hidden primary pattern, Postgres as the event bus, and AXFR + IXFR to push zones to public secondaries. Here's how and why we did it! Why Hetzner DNS Stopped Working for Us Every service on Sliplane gets a managed subdomain like my-app-abc123.sliplane.app. That means an A and AAAA record for every running service,