Xeno Senior Software Engineer Interview Questions and Answers

3Sum, target sum backtracking quesion, leetcode medium question

Q1. Gas station leetcode
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Q2. Dba differnce/explain mysql or nosql databse
Ans. 
MySQL is a relational database management system, while NoSQL databases are non-relational databases.
• MySQL is a traditional relational database that uses tables to store data and SQL for querying.

• NoSQL databases are non-relational and can be document-based, key-value pairs, wide-column stores, or graph databases.

• MySQL is ACID-compliant and suitable for complex queries and transactions.

• NoSQL databases are often used for...read more
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I was asked 2 DSA questions. I answered them but the interviewer wasn't aware of the complexity of different Data structures so according to him my solution was taking n^3 complexity whereas it was actually the solution of n

Interviewer asked two coding question medium level

Q1. I were asked to design parking lot Basically focusing on class diagram and how candidate is thinking about entities and design pattern
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Q1. This is also LLD round interviewer asked me to design book my show How freezing the seats work? In two cases if using sql or not using any database just using cache of application
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Q1. Based on core concepts of JavaScript and React fundamentals.
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Q1. Advance topics of React and JavaScript and easy and medium level of DS algo
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Q1. More like technical discussion on services that helps them to manage their product and problem solving if discussion not go long.
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Q1. Compensation and others formalities
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2 questions - 1 was on map and other on graph

Q1. Elevator system design
Ans. 
Designing an elevator system involves considering factors like capacity, speed, efficiency, and safety.
• Consider the number of floors in the building and the expected traffic flow to determine the number of elevators needed.

• Choose between different elevator types such as hydraulic, traction, or machine-room-less based on building requirements.

• Implement a control system to optimize elevator movement and reduce wait times...read more
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Q1. LLD of bookmyshow
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Q2. Concurrency Handling
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Q3. Race conditions
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Q1. Basic js question closure, async defer and all
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Q2. Create autosuggest debounce, pollyfill
Ans. 
Autosuggest debounce is a feature that delays the search suggestions until the user stops typing, and a polyfill is a piece of code that provides functionality that is not natively supported by the browser.
• Implement a debounce function to delay the autosuggest feature until the user stops typing.

• Use a polyfill to provide support for the autosuggest feature in browsers that do not natively support it.

• Example: Implement ...read more
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Q1. A programming question
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Q2. React-native architecture and flatlist
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Q3. Kadanes algorithm
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Kadane's algorithm is used to find the maximum subarray sum in an array of integers.
• Iterate through the array and keep track of the maximum sum ending at each index.

• At each index, choose between extending the previous subarray or starting a new subarray.

• Example: For array [-2, 1, -3, 4, -1, 2, 1, -5, 4], the maximum subarray sum is 6 (from index 3 to 6).
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Q4. Scalablity, performance
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