multi user groups, multi transports (email/sms/push/in-app), multithreading deep dive. flow: notification request -> queue (kafka) -> dispatcher service -> per-transport workers (thread pool). they grilled on: - ThreadPoolExecutor sizing - queue contention - retries w exponential backoff - dead letter queue standard but deep

Goldman sys design - notification + MT jul

multi user groups, multi transports (email/sms/push/in-app), multithreading deep dive.