Engineer’s Codex is a publication distilling real-world software engineering.Throughout the last few months, I’ve written about various tech “behind-the-scenes” in Big Tech, such as Meta's internal serverless platform and Google’s internally-loved code review tool.Apple, on the other hand, is not as public with their infrastructure. I wanted to find out how Apple built iCloud and in this article, I cover everything I know.Apple uses FoundationDB and Cassandra for iCloud and CloudKit, their cloud...