Here’s a breakdown of your topics: 1. Event bubbling in JavaScript - Explanation of event propagation (bubbling vs. capturing). - How to stop bubbling using event.stopPropagation(). - Practical examples, such as event delegation. 2. Database query optimization - Indexing strategies (B-Trees, Hash indexes). - Query execution plans (EXPLAIN ANALYZE). - Caching, denormalization, partitioning, and sharding. 3. Production debugging - Tools like Sentry, Datadog, New Relic, Grafana, and ELK Stack. - Debugging slow queries, memory leaks, and CPU spikes. - Best practices for logging and monitoring. 4. Senior manager questions - Handling team conflicts. - Decision-making under uncertainty. - Aligning technical goals with business objectives. 5. React.js questions - When to use hooks like useMemo, useCallback, useEffect. - Lifecycle methods in class components (componentDidMount, componentDidUpdate). - Optimizations like memoization, virtualized lists, and React Profiler.

How would you manage a large team?