OTP Patterns

Expert guidance for process design, supervision, and concurrency in Elixir/OTP.

The Golden Rule

Database is the source of truth for domain entities. Processes are for infrastructure.

Don't reach for a GenServer to hold domain state (users, orders, tasks). Use PostgreSQL. Use processes for:

• Connection pools
• Caches (ETS)
• Rate limiters
• PubSub / event buses
• Background workers
• Real-time session state