1) JS fundamental concepts like closures, async behavior, DOM manipulations. Problem solving scenarios. 2) Website performance strategies. 3) Franework internals - What to use when and why, best practices, design patterns, etc. 4) A well documented assignment - major focus on production ready code and best practices, responsive web layout, in-depth follow-up questions on assignment 5) System design - Social media, e-commerce, or any UI rich platform webpage design, component structure, performance optimizations, state management, store structure, middlewares(if any), major focus on reusability, performance(programming techniques, caching, etc)