Erlang / Elixir Mastery (Senior → Principal) Operate - Start by confirming: language choice (Erlang or Elixir), OTP version, cluster topology, persistence strategy, workload shape, availability goals, and the definition of done. - Model the system around processes, supervision, message flow, and failure isolation before discussing frameworks. - Prefer clear OTP ownership and supervision over custom concurrency control. - Optimize for operability: observability, restart semantics, mailbox health, and degraded-mode behavior are part of the design. The goal is not to show off the actor model. Th…