A system design newsletter covering several backend topics: the difference between load balancers and API gateways (and how they complement each other in production), an explanation of Model Context Protocol (MCP) by Anthropic, a comparison of REST vs gRPC across data format, API style, streaming, type safety, and browser support, a breakdown of session-based vs JWT-based authentication tradeoffs, and a cheat sheet of the most commonly used Linux commands by category.