System Design Interview Questions

Review this list of 346 system design interview questions and answers verified by hiring managers and candidates.
  • " Thanks a lot for showing us how a recommender system can be build. I see it was proposed to use Collaborative filtering which is user - item matrix having dimension N * M (where N - number os users and M - number of songs). Though, it was explained how it gonna be built, it is still unclear how all users and songs features are going to be used. In that matrix we have values in cell (lets say i, j) like 1 - a specific user (i) clicked on song (j) when it was recommended or it is 0 when the user"

    Dinar M. - " Thanks a lot for showing us how a recommender system can be build. I see it was proposed to use Collaborative filtering which is user - item matrix having dimension N * M (where N - number os users and M - number of songs). Though, it was explained how it gonna be built, it is still unclear how all users and songs features are going to be used. In that matrix we have values in cell (lets say i, j) like 1 - a specific user (i) clicked on song (j) when it was recommended or it is 0 when the user"See full answer

    System Design
    Technical
    +1 more
  • Amazon logoAsked at Amazon 
    Product Manager
    System Design
    +2 more
  • Google logoAsked at Google 
    +7

    "Great. I will start by understanding the goal of Google Photos and how it aligns with the goal and mission of Google. After defining goals, I will talk about the user actions which will contribute towards this goal. Based on these actions, we will define metrics. Check-in with the interviewer on the approach here. Assuming that this looks good for the interviewer to proceed. Google Photo - Helping users organise & manage their pictures. Completely in line with Google's mission. Thinking ab"

    Harshit G. - "Great. I will start by understanding the goal of Google Photos and how it aligns with the goal and mission of Google. After defining goals, I will talk about the user actions which will contribute towards this goal. Based on these actions, we will define metrics. Check-in with the interviewer on the approach here. Assuming that this looks good for the interviewer to proceed. Google Photo - Helping users organise & manage their pictures. Completely in line with Google's mission. Thinking ab"See full answer

    Product Manager
    System Design
    +1 more
  • "Background A. Objective Lyft has a presence in Toledo, Ohio. At our current revenue per ride of $6, we can match 60% consumers requesting a ride with a driver. Our goal is to maximize net revenues in the next 12 months by figuring out the optimal revenue per ride. B. TLDR Summary · With a target market of (~100K-138K) consumers, on a $25 charge to consumers, Lyft should pay $20.75 to drivers and fix its share at $4.25 to maximize its net revenues over a 12-mont"

    Eshan P. - "Background A. Objective Lyft has a presence in Toledo, Ohio. At our current revenue per ride of $6, we can match 60% consumers requesting a ride with a driver. Our goal is to maximize net revenues in the next 12 months by figuring out the optimal revenue per ride. B. TLDR Summary · With a target market of (~100K-138K) consumers, on a $25 charge to consumers, Lyft should pay $20.75 to drivers and fix its share at $4.25 to maximize its net revenues over a 12-mont"See full answer

    Product Manager
    System Design
    +1 more
  • Meta (Facebook) logoAsked at Meta (Facebook) 
    Video answer for 'Design a web crawler.'
    +6

    "I don't get the capcity numbers for the storage, if we assume that we crawl 1bn web pages then the formula is "1bn X 100kb" . There is an extra 100 representing the number of pages that is redundant in the video"

    Selim Y. - "I don't get the capcity numbers for the storage, if we assume that we crawl 1bn web pages then the formula is "1bn X 100kb" . There is an extra 100 representing the number of pages that is redundant in the video"See full answer

    Engineering Manager
    System Design
    +1 more
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  • Google logoAsked at Google 

    "The question is bit vague (I guess deliberately) so I believe firstly we shall ask questions and resolve ambiguity. Some initial questions could be : 1) Is this one time activity or something that should be done on continuous basis. If continuous basis then at what frequency. 2) How much staleness is acceptable in SYSTEM Y data 3) Are there any limitation in SYSTEM Y and is it fair to assume that we would need some kind of transformation to bring data into SYSTEM Y schema. 4) What kind of vol"

    Kshitij A. - "The question is bit vague (I guess deliberately) so I believe firstly we shall ask questions and resolve ambiguity. Some initial questions could be : 1) Is this one time activity or something that should be done on continuous basis. If continuous basis then at what frequency. 2) How much staleness is acceptable in SYSTEM Y data 3) Are there any limitation in SYSTEM Y and is it fair to assume that we would need some kind of transformation to bring data into SYSTEM Y schema. 4) What kind of vol"See full answer

    Engineering Manager
    System Design
  • Meta (Facebook) logoAsked at Meta (Facebook) 

    "At a high level, the core challenge here revolves around building an effective recommendation algorithm for news. News is an inherently diverse category, spanning various topics and catering to a wide array of user types and personas, such as adults, business professionals, general readers, or specific cohorts with unique interests. Consequently, developing a single, one-size-fits-all recommendation algorithm is not feasible. To enhance the personalization of the news recommendation algorithm,"

    Sai vuppalapati M. - "At a high level, the core challenge here revolves around building an effective recommendation algorithm for news. News is an inherently diverse category, spanning various topics and catering to a wide array of user types and personas, such as adults, business professionals, general readers, or specific cohorts with unique interests. Consequently, developing a single, one-size-fits-all recommendation algorithm is not feasible. To enhance the personalization of the news recommendation algorithm,"See full answer

    Machine Learning Engineer
    System Design
    +1 more
  • Meta (Facebook) logoAsked at Meta (Facebook) 
    Technical Program Manager
    System Design
  • Amazon logoAsked at Amazon 

    "I started asking some questions regarding the constrains of the system: An antena is emitting a signal that says if the tagged device was out of the room where the interview was happening. I was able to decide which would be the schema for the Antena's message. The antena is sending the info of multiple users. The system doesn't need to push notification to the users when the user left the device behind. Upon reflection, this is what I recollected doing. I propuse the json schema a"

    Eduardo C. - "I started asking some questions regarding the constrains of the system: An antena is emitting a signal that says if the tagged device was out of the room where the interview was happening. I was able to decide which would be the schema for the Antena's message. The antena is sending the info of multiple users. The system doesn't need to push notification to the users when the user left the device behind. Upon reflection, this is what I recollected doing. I propuse the json schema a"See full answer

    Software Engineer
    System Design
  • Booking.com logoAsked at Booking.com 
    Video answer for 'Design a metrics and logging service.'

    "For somebody who needs accessibility accommodation, this doesn't have a transcript so it is not useful to me."

    Shivastuti K. - "For somebody who needs accessibility accommodation, this doesn't have a transcript so it is not useful to me."See full answer

    Software Engineer
    System Design
    +2 more
  • Meta (Facebook) logoAsked at Meta (Facebook) 

    "Scoped out problem constraints - how much data to download, how many computers, and how much time, how you can be detected (decentralized load). Designed a web crawler."

    Faraz A. - "Scoped out problem constraints - how much data to download, how many computers, and how much time, how you can be detected (decentralized load). Designed a web crawler."See full answer

    Engineering Manager
    System Design
    +1 more
  • "Inventory Service and Registration service can they be in SYNC always ?? The "experience layer" needs accessed by Hotel owners also ??? How does real time inventory come from all Hotels ???"

    Anup S. - "Inventory Service and Registration service can they be in SYNC always ?? The "experience layer" needs accessed by Hotel owners also ??? How does real time inventory come from all Hotels ???"See full answer

    System Design
  • Databricks logoAsked at Databricks 
    Software Engineer
    System Design
    +1 more
  • Google logoAsked at Google 
    Software Engineer
    System Design
    +1 more
  • Google logoAsked at Google 
    Video answer for 'Estimate the storage needs for Google Photos on Pixel phones.'
    +3

    "Estimate how much it costs Google to store a year free of storage of photos for new Pixel Phones Clarify with Questions Know the Basic Numbers Decide on and Lay Down Your Structure Write Down the Equations Crunch Numbers Sanity Check Clarify with Questions Are we talking about cost per person? Whole user base? What do you mean when you are talking costs? Cost to build the facility? Cost to just store the data as a result o"

    Viet H. - "Estimate how much it costs Google to store a year free of storage of photos for new Pixel Phones Clarify with Questions Know the Basic Numbers Decide on and Lay Down Your Structure Write Down the Equations Crunch Numbers Sanity Check Clarify with Questions Are we talking about cost per person? Whole user base? What do you mean when you are talking costs? Cost to build the facility? Cost to just store the data as a result o"See full answer

    System Design
    Estimation
  • Adobe logoAsked at Adobe 
    Video answer for 'Design a typeahead box for a search engine.'
    +5

    "It would have been more interesting to focus on the system design rather than the Trie DS, Interviewee could have just mentioned the Trie and passed to things more important. Interviewee should have focused on the factors on which he wants to scale the API servers, popularity of the query parts ? region may be ? A hash of many factors ? Caches should have definitely be discussed, Cache eviction policies, Cache invalidation managements... Interviewee should have mentioned which kind of API pro"

    Aymen D. - "It would have been more interesting to focus on the system design rather than the Trie DS, Interviewee could have just mentioned the Trie and passed to things more important. Interviewee should have focused on the factors on which he wants to scale the API servers, popularity of the query parts ? region may be ? A hash of many factors ? Caches should have definitely be discussed, Cache eviction policies, Cache invalidation managements... Interviewee should have mentioned which kind of API pro"See full answer

    Software Engineer
    System Design
    +1 more
  • Meta (Facebook) logoAsked at Meta (Facebook) 

    "Designing a video streaming system like Netflix or Facebook Video involves addressing multiple aspects, such as scalability, availability, low latency, and high performance. Here's a high-level design: System Requirements Functional Requirements: User Management: User sign-up, login, and profile management. Subscription plans and payment integration (for Netflix-like systems). Content Management: Upload, edit, and delete videos. Categorize content (genres, recommendations). Video Playback: S"

    Kamal .. - "Designing a video streaming system like Netflix or Facebook Video involves addressing multiple aspects, such as scalability, availability, low latency, and high performance. Here's a high-level design: System Requirements Functional Requirements: User Management: User sign-up, login, and profile management. Subscription plans and payment integration (for Netflix-like systems). Content Management: Upload, edit, and delete videos. Categorize content (genres, recommendations). Video Playback: S"See full answer

    Engineering Manager
    System Design
    +1 more
  • Amazon logoAsked at Amazon 
    Software Engineer
    System Design
  • Meta (Facebook) logoAsked at Meta (Facebook) 
    Video answer for 'Design Facebook Newsfeed.'

    "How might the system design change if it is limited specifically to a web/mobile use case?"

    San S. - "How might the system design change if it is limited specifically to a web/mobile use case?"See full answer

    System Design
    Product Design
  • Airbnb logoAsked at Airbnb 
    Video answer for 'Design Airbnb's search functionality.'
    +2

    "The back-of-the-envelope calculation is very well done!"

    Ushita S. - "The back-of-the-envelope calculation is very well done!"See full answer

    System Design
Showing 61-80 of 346