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Discord serves hundreds of millions of registered users, handles trillions of stored messages, and routes voice traffic through over 850 servers across 30+ data centers. None of that runs on a single clever trick. It runs on a stack that has been replaced, migrated, and rewritten in pieces as each layer hit its ceiling.
Netflix streams to over 300 million subscribers across 190 countries, serves petabytes of video daily, and runs one of the most sophisticated engineering organizations in the world. Here is how they built it. Also, they rejected me. Three times. But we will get to that.
PayPal processes billions of transactions across 200 markets, serves over 400 million active accounts, and must be correct one hundred percent of the time. As a software engineering intern here, I have spent considerable time thinking about how this system actually works.
Reddit serves billions of pageviews a month, hosts millions of communities, and handles some of the most unpredictable traffic spikes on the internet. Here is how they built it, what broke along the way, and what the architecture looks like today.