MIT 6.5840, formerly 6.824, is a legendary distributed systems course where you build real systems like a MapReduce framework. It's hard because debugging race conditions in a lab feels like chasing auto-rickshaws in Bangalore traffic—frustrating but teaches you precision. They use Go for its built-in concurrency primitives, which are cleaner than threads, and honestly, because the industry building cloud infra is adopting it fast. I'm grinding through it now, and the pain is worth it—every line of Go I write feels like direct prep for those system design rounds at Amazon or Google.
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