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An architecture note on using a single supervised GenServer for serialized state in Elixir: requirements, a minimal implementation, trust boundaries, production checks, and the conditions that should push you to ETS, sharding, or distribution.
GenServer serializes access to state without locks. This post builds a working key-value store, puts it under supervision, and explains when a single process becomes the bottleneck.
GenServer and supervision trees give fault‑isolated, stateful processes with automatic restart and state recovery—no external orchestrator needed. A worked example shows per‑device telemetry ingest with DynamicSupervisor.
A diagnostic guide to Elixir memory bloat: distinguish process growth from legitimately large data, find the hog processes, and apply targeted fixes for state, binaries, ETS, and recursion.