Test-Driven Elixir APIs with GenServer State Management

Building highly concurrent, fault-tolerant web applications requires a solid grasp of state management and testing. This text-based course guides you through the foundational concepts of Elixir development, showing you how to confidently design APIs using a test-driven approach. You will learn how to isolate state, handle errors gracefully, and validate incoming data using the language's native strengths. By reading through practical explanations and studying clear code patterns, you will transform your understanding of functional programming into a structured development workflow. What you'll learn: - Understand the core principles of the Actor model and process isolation in Elixir - Build custom GenServers to manage state reliably across your application - Write comprehensive unit and integration tests using ExUnit before writing your API logic - Handle process failures and manage supervisors for self-healing state - Validate API payloads and handle errors gracefully using pattern matching - Implement modern code organization patterns and type specifications for cleaner maintenance This course begins with essential terminology, process mechanics, and testing fundamentals before moving into step-by-step API construction and state-tracking patterns. You will follow a logical progression from simple process communication to building a resilient, fully tested stateful API. This course is designed for beginner to intermediate Elixir developers who want to deepen their understanding of state management and test-driven design. No prior experience with GenServers or advanced OTP behaviors is required. Start reading today to master reliable state management and test-driven API design in Elixir.