System Design Interview Questions

James H. - "I broke the vehicles down by regions in the world. Designed a wireless api interface to sync with a database backend that linked to google maps through another service and api."See full answer

Teja G. - "separate your application into three distinct layers: a Presentation Tier for the user interface, an Application Tier for business logic, and a Data Tier for data storage. Implement each tier using appropriate technologies, deploy them across different network segments for security, and configure communication protocols to allow for independent management and scaling."See full answer

Aditya O. - "Why is it answered like a Product Design Question? Shouldn't this be a strategy type answer analyzing the pros/cons of the service etc.?"See full answer

Luca D. - "The real discussion was very much similar o what exposed at https://www.tryexponent.com/courses/software-engineering/system-design/design-rate-limiter, but - as I commented the video - the real interviewer wasn't so naive to do not forgive the client identification only because IP. I had to introduce glimpses of https://en.wikipedia.org/wiki/Knowyourcustomer practice, I quoted JWT. I proposed a logical map of id addressing a "deque" of time-stamps of requests, with a threshold for the deque an"See full answer

Graig - "Do any one know how to build trie using IP address?"See full answer

Vishal B. - "Design an elevator for the blind Clarification Questions A person who is not able to see at all or a person who can partially see? - completely blind Are we we focusing on the people who are visually impaired but, no other physically challenge? - Yes Goal Company already have the elevator products and now company is trying to enter into new market space. Users Blind users with some assistance - we are not focused on these people as they already have some a"See full answer

Yomna H. - "Evication Strategy: LFU Access Pattern: Write Around"See full answer

Ramesh Y. - "Clarification - is it Uber that is building the feature? Answer: Yes Assuming if Uber is the one building this feature, I would start with if and how does the feature help Uber's mission and north star metrics. Uber's mission is to provide reliable transportation around the world and the primary metric that i can think on a high level is Number of rides , Number of drivers and from business revenue perspective revenue per ride, revenue per rider and driver. I picked revenue per ride because it"See full answer

Bini T. - "I understand this is more focused on ML. However, I have a system question. If users allow us to access their location, or they send location via text box, could we use CDNs for the search without hitting our database? We only query the database when we have zero information on location. Other questions: does embedding always guarantee information on location? Do we discharge the user images after we return a prediction? I heard the feedback that we should keep it for future learning. What would"See full answer

Abhi R. - "TCP server/client to facilitate high throughput of incoming metrics.(This is the standard used in the industry by Datadog etc). NoSQL or timeseries database for storing metrics. Timeseries databases are better for aggregating metrics in a given time period. REST API for serving metrics data to visualization frontend."See full answer

Rashmi T. - "It depends on how computers are distributed. Are they located within same network (behind same switch or router) or distributed across globally? Also, it depends upon if there are any security related encryption or decryption algorithms being executed. Similarly, there are so many factors involved in it. However, if a system is highly responsive then this time might be less than 1 second. For example, any google search responds in less than 1 sec. It is an interesting question and I am eager t"See full answer

Yash G. - "import lombok.*; import org.springframework.boot.CommandLineRunner; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.stereotype.Component; import org.springframework.stereotype.Repository; import org.springframework.stereotype.Service; import java.time.LocalDateTime; import java.util.*; @SpringBootApplication public class LldPracticeApplication { public static void main(String[] args) t"See full answer