Building an API Layer with GenServer in Elixir

In modern backend development, managing state reliably across concurrent operations is a critical challenge. Elixir offers a powerful, built-in solution through GenServer and OTP behaviors, allowing you to build highly resilient systems without external state-management libraries. This text-based course guides you through the foundational concepts of OTP and shows you how to design a clean, reliable API layer. You will transition from understanding basic concurrency to structuring production-ready Elixir processes that handle validation, state updates, and unexpected failures gracefully. By reading through practical code implementations, you will learn how to structure your application for maximum reliability and maintainability. What you'll learn: - Understand the core principles of OTP, processes, and the GenServer lifecycle - Implement synchronous and asynchronous calls using GenServer callbacks - Design a clean API layer that separates client-facing interfaces from internal process logic - Handle state validation and manage errors to prevent process crashes - Apply modern Elixir practices including structured logging and telemetry basics for observability - Configure supervision trees to ensure your API layer automatically recovers from failures The course starts with essential concurrency terminology and the mechanics of message passing. Next, you will read through step-by-step implementations of stateful servers, validation layers, and supervision strategies, building your understanding from the ground up. This course is designed for beginner to intermediate Elixir developers who understand basic syntax and want to master state management and concurrent architecture. No prior experience with GenServer or OTP is required. Start reading today to build resilient, fault-tolerant API layers in Elixir.