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You are in charge of scaling a file sharing API. Please provide an example of how you would build this infrastructure on the cloud provider of your choice. Be specific with your selections and explain why you would choose one technology over another.
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Senior DevOps Engineer

Interviewed at Sensibill

3.9★
Nov 18, 2021

You are in charge of scaling a file sharing API. Please provide an example of how you would build this infrastructure on the cloud provider of your choice. Be specific with your selections and explain why you would choose one technology over another.

first round: Design an **Autocomplete System** that provides the **top 10 most-searched words** based on a given prefix. 1. **Insert a Word:** Utilize a **Trie** structure, storing words and their frequencies at the leaf nodes. 2. **Retrieve Suggestions:** Traverse the Trie for the prefix, then apply a **max-heap** to track the top 10 words by frequency. 3. **Time Complexity:** - **Insertion:** O(L), where L is the length of the word. - **Search:** O(P + K log K), where P is the length of the prefix and K is the number of suggestions. Example: For the prefix **"ap"**, suggestions may include: `apple (50)`, `app (40)`, `apricot (30)`, `application (20)`. high level design, without coding second round was to design a system that relates to blockchain, to fetch transaction from it and to find specific details in specific blocks, store it on a db and fetch it from there in future searches (not sure the interviewer was 100% sure about the specifications of the system)
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backend devops developer

Interviewed at Dcentralab

4.5★
Jan 14, 2025

first round: Design an **Autocomplete System** that provides the **top 10 most-searched words** based on a given prefix. 1. **Insert a Word:** Utilize a **Trie** structure, storing words and their frequencies at the leaf nodes. 2. **Retrieve Suggestions:** Traverse the Trie for the prefix, then apply a **max-heap** to track the top 10 words by frequency. 3. **Time Complexity:** - **Insertion:** O(L), where L is the length of the word. - **Search:** O(P + K log K), where P is the length of the prefix and K is the number of suggestions. Example: For the prefix **"ap"**, suggestions may include: `apple (50)`, `app (40)`, `apricot (30)`, `application (20)`. high level design, without coding second round was to design a system that relates to blockchain, to fetch transaction from it and to find specific details in specific blocks, store it on a db and fetch it from there in future searches (not sure the interviewer was 100% sure about the specifications of the system)

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