Extending Elixir APIs Safely with GenServer

When your Elixir applications grow, updating your public APIs without breaking existing clients becomes a critical challenge. Managing state transitions and maintaining seamless backward compatibility requires a structured, process-oriented approach. This text-based course guides you through the principles of designing robust, maintainable APIs that leverage the full power of Elixir's concurrency model. You will transition from writing basic functional code to designing resilient, process-driven architectures. By understanding how to isolate state and manage concurrent requests safely, you will be able to roll out API updates with complete confidence. What you'll learn: - Understand the core architecture of GenServer and its role in Elixir state management - Implement backward-compatible API changes using structured state migration patterns - Isolate processes to prevent system-wide failures and improve fault tolerance - Configure supervision trees to manage and restart GenServer processes safely - Apply modern testing patterns with ExUnit to verify concurrent API behavior This course begins with foundational concepts, establishing a clear understanding of the BEAM virtual machine, process mailboxes, and GenServer callbacks. You will then progress through step-by-step written explanations and practical code scenarios that demonstrate how to refactor live APIs without interrupting service. This course is designed for beginner to intermediate Elixir developers who understand basic syntax and want to master concurrent API design. No prior experience with advanced OTP behaviors is required. Start reading today to build resilient, future-proof Elixir APIs.