LinkedIn Software Engineer Interview Questions

I would inspect metrics, logs, and recent changes to find where the slowdown starts. Then I would narrow the issue to a specific dependency, query, or code path before changing anything. Good debugging is about isolating the bottleneck instead of guessing.

I would focus on caching, geographic distribution, invalidation, and fallback behavior. Then I would make sure content can be served quickly while staying fresh enough for users. A strong answer shows that performance and consistency both matter.

I would compare the options using correctness, cost, maintainability, and user impact rather than treating it like a personal debate. Then I would try to reach a decision the team can support and execute cleanly. The best engineers know how to disagree without slowing the team down.

I would separate data collection, candidate generation, ranking, and feedback loops. Then I would think about latency, freshness, and how to measure whether recommendations are actually helping users. A good answer shows both product awareness and system thinking.

I would make each node represent one character and store links to the next possible characters. That structure is useful when prefix lookup matters more than direct index access. It is a classic way to show strong understanding of string data structures.