Web and Distributed

Phase 6 brings everything together in production-style Elixir systems: web interfaces, data persistence, authentication, distributed coordination, observability, and deployment. This phase is intentionally broad because modern applications require multiple layers working together, not isolated language features.

You will progress through Phoenix Framework, LiveView, Ecto, Nerves, Distribution, Deployment, Phoenix Authentication, and Telemetry and OpenTelemetry.

Who this phase is for:

• Developers building end-to-end services with Elixir in production contexts.
• Teams moving from monolithic apps to distributed or event-driven architectures.
• Engineers responsible for both shipping features and operating systems reliably.

What you should be able to do after this phase:

• Build Phoenix and LiveView applications with clear boundaries.
• Model and query data with Ecto safely.
• Implement authentication and access-control basics in Phoenix.
• Operate distributed BEAM nodes and understand trade-offs.
• Add telemetry and tracing that supports debugging and performance work.
• Package and deploy releases with repeatable runbooks.

Common pitfalls to watch for:

• Shipping without instrumentation and then debugging blind.
• Treating authentication as only a UI concern.
• Coupling deployment details directly into application logic.
• Ignoring failure modes in distributed workflows.

When you complete this phase, you should be able to design a small production-ready architecture and explain not only feature code, but also runtime behavior, operations, and monitoring strategy.

As you work through these lessons, keep an architecture notebook with decisions and trade-offs: routing boundaries, auth strategy, schema design, deployment assumptions, and instrumentation targets. That habit makes your system easier to evolve as requirements and traffic patterns change.