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We use a number of 3rd party APIs, and the problem we hit was knowing which to trust, which were reliable and which could be counted on.

I'm obviously not talking about your Googles / Twilios / Auth0s / etc. I'm talking about the longer tail of services that we don't want to build ourselves, but that there isn't instantly a big name service that provides it.

We would try one or two, and then find that they would work great in testing, but when you put any kind of load on them then they would regularly fall down. Similarly, when you reach out for help - while you're in the buying phase, they're very responsive - but as soon as you need support, you're looking at days not hours for a reply.