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Technical patterns

Focused topics, kept short: a real problem, the chosen pattern, the pitfalls. Each write-up reads in a few minutes.

Wildcard TLS via DNS-01Obtaining and renewing a wildcard Let's Encrypt certificate without exposing anything.Internal DNS override with CoreDNSResolving your public domains to private addresses, cleanly.Designing a persisted retry queueGuaranteed event delivery without a broker: PostgreSQL, exponential backoff, resuming after a restart.