Building Functional Core Components in Elixir with OTP

When building concurrent systems in Elixir, developers often rush to wrap everything in processes, leading to complex state management and hard-to-test code. The secret to scalable Elixir design is separating your pure business logic from the concurrent runtime. This course teaches you how to construct solid, testable functional cores before introducing OTP processes. You will learn to design robust data-centric systems that remain clean and maintainable as your application grows. By the end of this course, you will be able to confidently architect Elixir applications that separate pure functional rules from runtime state and side effects. What you will learn: Understand Elixir data-centric design and the functional core, imperative shell pattern; Construct robust domain models using Elixir structs and type hints; Design functional templates and state machines without relying on active processes; Integrate modern code formatting and testing practices using pytest-style Elixir testing tools; Connect your functional core to OTP components like GenServer and Supervisor pools; Implement modern observability patterns to monitor your core business logic. You will start with foundational concepts, learning why process-free cores are easier to test, before moving step-by-step into structural design, state transitions, and final OTP integration. This course is designed for beginner Elixir developers who understand basic syntax and want to learn professional application architecture. No advanced OTP or concurrency experience is required to begin. Start reading today to write cleaner, more resilient Elixir code.