Help me to learn low level system design for a backend engineer.

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Welcome to low-level system design for backend engineers. Unlike high-level architecture that focuses on multiple services, low-level design is about optimizing the internal workings of your service. This includes understanding how your code interacts with the operating system, manages memory, handles concurrency, and communicates over networks. The core areas you need to master include data structures and algorithms, concurrency and parallelism, memory management, operating system fundamentals, network programming, database optimization, and performance profiling. Think of it as understanding the engine under the hood of your backend service.