AmericanExpress

Interview Process for Engineer - II (2021) (Personal):

Design an Application that serves machine learning model results in real-time (Design a feedback ingestion system and notifications pusher) - Brush upon system design concepts, NoSQL Databases, caching, load balancer frameworks, distributed computing fundamentals, APIs, software design patterns.

Implement KNN (K-Nearest neighbors) algorithm at scale - Start from scratch - Try to think of solution that doesn't rely on existing cluster computing frameworks like spark, Dask etc - performance and efficient design matters! - very good question, completely depends on the distributed and parallel processing paradigms and operating systems knowledge.