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

Raina M. - "Clarify the ask/ goal and scope Talk about the general need for travel in a Covid/post covid world + how it aligns with Meta's mission and business (the Why) Audience /Behavior segmentation with needs/pain points Prioritize Suggested 3 Solution territories Dived deep into 1 and mentioned tradeoffs/ risks for that one Summarized with a few GTM considerations/ideas Please note: Although the interview was scoped for 30 mins, the interviewer spent the first 15 diving into past work e"See full answer

Xash C. - "This one is a great example of Build, Borrow, or Buy strategy framework (http://www.build-borrow-buy.com/build-borrow-or-buy-in-practice/) - explore and evaluate three different approaches: organic growth and building a product from scratch (e.g. Amazon building its own Amazon Restaurants service), partnering with an existing provider (e.g. enterprise-level partnership with Instacart or Lyft), or acquisition growth (e.g. Uber acquiring Postmates). Evaluate which approach makes sense for the com"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

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

Anonymous - "Functional requirements: (a) location tracking (b) check-in at nearby place (c) view historical checkins with how much time user stayed there (d) Mark checkout when out of proximity (e) analytics - checkins by user at given loc, top n places Out of scope: (a) checkin sharing with followers Non functional: (a) low latency (b) high availability (c) eventual consistency Scale: (a) QPS: 10M DAU * 2 checkins /86400 seconds (b) Yearly Data Volume: 10M* 0.1 KB *365 days HLD: user -> location servic"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

Anonymous Parrotfish - "when and where?"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