Looking back at the last few years of building Rapportive and LinkedIn Intro, I realised that there were a number of lessons that we had to learn the hard way. We built some reasonably large data systems, and there are a few things I really wish we had known beforehand.
None of these lessons are particularly obscure – they are all well-documented, if you know where to look. They are the kind of things that made me think “I can’t believe I didn’t know that, I’m so stupid #facepalm” in retrospect. But perhaps I’m not the only one who started out not knowing these things, so I’ll write them down for the benefit of anyone else who finds themself having to scale a system.
The kind of system I’m talking about is the data backend of a consumer web/mobile app with a million users (order of magnitude). At the scale of Google, LinkedIn, Facebook or Twitter (hundreds of millions of users), you’ll have an entirely different set of problems, but you’ll also have a bigger team of experienced developers and operations people around you. The mid-range scale of about a million users is interesting, because it’s quite feasible for a small startup team to get there with some luck and good marketing skills. If that sounds like you, here are a few things to keep in mind.
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