[Uptrenda]

It's ok, sure it's stressful when something like this happens. Software is a hard field and the amount of things that can go wrong is immense. When I think about how few errors and downtime some of the larger services have I realize how much work must be involved.

[code_biologist]

I'd divide "things going wrong" into forced and unforced errors. Your upstream service providers sending subtly malformed data is a forced error. It happens. Doing user agent sniffing for presentation, poorly, is an unforced error.

It's not amateurish to have problems. It is amateurish (or malicious) to have problems caused by this specific class of issue.