System Design Interview Questions

Anonymous Parrotfish - "when and where?"See full answer

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

Darshak S. - "Clarifying Questions: There are several different types of therapists, do you have a particular therapist in mind? Like Mental health, physical health, food and nutrition etc? Reply: You can decide And do we know what country are we building this product, since that will help me narrow down the scope of the product? Reply: USA Approach: Define the product vision and the goal that we want to achieve Target Audience is for this particular product What problems do these user currently"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

Brody C. - "Clarifying Questions: When you say Language Learning app, you're referring to a user wanting to learn a new language through a Meta property - not NLP tech correct? -- Yes Is this a stand-alone app, or part of Facebook or another Meta app? -- You choose Are there any restrictions like budget, or time for this learning app? -- Nope. Give me a moment to think about how I want to structure this answer: Mission // Goal of Language Learning App Competition Audience Segments Pain Points "See full answer

Yulia D. - "What age of kid we are speaking about? Lets assume 5-10 years what messenger app are we talking about? you can choose Who is creating the feature? you can choose Finally, do we have any constraints? no, please, just imagine ok. so I think company's goal should be giving the tools for building communities among the youngest ones. First I want to issue what is Kids messenger app. I have kid of 5 years old and among my friends there are only few with gudgets that can provide messenger f"See full answer

Chaitali M. - "Clarifications: Is it the voice only Alexa devices or includes echo show (video)? Goal: To have people to safety quickest Users: Alexa owner At the house when somebody breaks in Family Single adult/seniors Outside the house at the time of break in Police Department Pain points/user group: Owner in the house at the time of burglary Inform all the house members at the earliest. Send SOS out on all/selective Alexa devices to ask family members to reach a safe place 2"See full answer