Staff Software Engineer - Compute Infrastructure

LinkedIn

Given a string s, find the length of the longest substring without repeating characters. For example: Input: s = abcabcbb Output: 3 Explanation: The answer is abc, with the length of 3. Input: s = bbbbb Output: 1 Explanation: The answer is b, with the length of 1. Input: s = pwwkew Output: 3 Explanation: The answer is wke, with the length of 3. Notice that the answer must be a substring; pwke is a subsequence and not a substring. Input: s = Output: 0 Implement an algorithm in your chosen language to efficiently determine the length of the longest substring without repeating characters in the given input string. Consider the time and space complexity of your solution. Can you optimize your approach to achieve the best possible performance, especially for very large input strings? What are the edge cases to consider, such as empty strings or strings with only one character?

LinkedIn

Let's design the LinkedIn feed. Consider the user experience, key features, scalability, and personalization aspects. For instance, how would you prioritize content from connections versus suggested content? How would you handle different content types like text, images, videos, and articles? How do you design a system to ensure that the feed remains responsive even with millions of active users? How would you personalize the feed to show users content they are most likely interested in, and what data would you use to achieve this personalization? Finally, how would you prevent the spread of misinformation or harmful content within the feed?

LinkedIn

Let's walk through a past project you've worked on. I'm interested in understanding your approach, the challenges you faced, and how you overcame them. To start, please describe a project where you had significant ownership and responsibility. Elaborate on the project's goals, your specific role, and the technologies you utilized. For example, perhaps you led the development of a new feature for a mobile application using React Native, or you were responsible for optimizing a database query that was causing performance bottlenecks. As you describe the project, please highlight the key decisions you made and the rationale behind them. I'd also like to hear about any unexpected obstacles you encountered and the steps you took to address them. This could include technical challenges, team coordination issues, or changes in project requirements. For instance, how did you handle a situation where a critical dependency was deprecated, or when a team member was unable to complete their assigned tasks? Finally, I'm keen to learn about the outcomes of the project and how you measured its success. What were the key performance indicators (KPIs) that you tracked, and what were the results? Did you achieve the project's goals, and what lessons did you learn from the experience? Please provide specific examples and quantify the impact of your contributions whenever possible. This walkthrough will help me understand your problem-solving skills, technical expertise, and ability to work effectively in a team environment.