System Design Interview Questions

Yash G. - " import java.util.*; enum RideType { SHARED, PRIVATE, EXECUTIVE } enum VehicleType { SEDAN, SUV, HATCHBACK, LUXURY, VAN, ELECTRIC, AUTO_RICKSHAW, BIKE_TAXI } final class Location { private final double logitude; private final double latitude; private final String location; public Location(double logitude, double latitude, String location){ this.logitude = logitude; this.latitude = latitude; this.l"See full answer

Mark - "Clarifying questions: What's Lyft current goal and how does this new focus on Deaf drivers align with Lyft's goal & strategy? Do Lyft already have service/product to enable deaf users to drive for lyft? Assume We don't have any existing product/service to allow deaf users to drive for Lyft today We are designing for the ridesharing business and that the Deaf drivers can drive for all types of Lyft rideshare options Lyft's Mission: Improve people's lives w/ the world's best transport"See full answer

Sneha D. - "Created a solution for remote online learning app on the lines of coursera and also made a option for live streaming classes . Uni admin creates uni account, courses, adds instructors; instructors can create content , give classes ; student searches, enrols, consumes content. Used micro services architecture with APIs for all functions, RDBMS, NoSQL , indexed with redis and elastic."See full answer

Karthik M. - "Structure Why should we build this? + market, company, product, trends Users Painpoints Solutions Summary Clarify company - 0 to 1 Why should build this Market factors Size and opportunity (tam) sizeable market - billions of dollars in TAM Competitors (1) governments (2) parkmobile (3) vendors for each parking lot (parking structures / lots, man people) Strengths Parkmobile - available anywh"See full answer

Hamilton D. - "I will teach the user to use the application in a simple and objective way"See full answer

Sunny G. - "https://en.wikipedia.org/wiki/Operational_transformation"See full answer

Deepti K. - "I gave multiple answers including polling the service every 10 sec to see customer. Or we can have the client side call which will send this data after 10 sec to us. We will store in dynamo DB and then send through pipelines to redshift DB for analytics."See full answer

Ian R. - "You might build a product like this a few ways. I think you'd definitely want a temperature sensor device (maybe like a TMP422, or maybe there's a different one that is standard for wearables) that was worn by the individual. As far as tracking social distance, my answer here is more dependent on the state of the art of robust (wearable) distance measurement. Maybe there's something available better than ultrasonic sensors, maybe there's some kind of electromagnetism based solution that isn't in"See full answer

William W. - "Clarifying questions Why is this company interested in building a vending machine for disabled people? We're a vending machine company who has recently learned that disabled people have a lot of trouble using our machines. We want to change that. What is the main metric this company is trying to drive? Machine usage Is there a specific kind of disability we are interested in targeting? Blind, amputees etc. Blind/vision impaired people Is there a specific type"See full answer

gdecuri - "Load Balancer to multiple API Servers, pub sub system to publish user events, Game Engine Service, Write through cache and NoSQL DB. HTTP Long Polling to get user status updates"See full answer

Nilanjan D. - "I think we can analyse the data that's collected especially the users who are requesting it.if we find that there are set of users who regularly use this service then we may cache the data for those users to speed up processing and better the experience. The fresh data (which will be a delta on the cached data can only be calculated) and the stale data can be left out thereby updating the cache"See full answer