Pixis Senior Data Scientist Interview Questions and Answers

Q1. Difference between null and object.
Ans. 
Null is absence of value while object is a collection of properties and methods.
• Null is a primitive value while object is a complex data type.

• Null is used to indicate absence of value while object is used to represent real-world entities.

• Null cannot have properties or methods while object can have both.

• Example of null: let x = null; Example of object: let person = { name: 'John', age: 30 };
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Array and Java related questions

I was asked to implement lru cache which i did but still didn’t made to next round as apparently i didn’t complete the working code though in my opinion i did

Q1. Complete Code for Ludo Game. Sort of Machine coding round.
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Q2. Given an array of intervals and return the minimum number of intervals you need to remove to make the rest of the intervals non-overlapping.
Ans. 
Remove overlapping intervals to minimize removals.
• Sort intervals by end time

• Iterate through intervals, remove overlapping intervals

• Return count of removed intervals
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Q1. Design Least recently used cache.
Ans. 
Design a Least Recently Used cache system.
• Implement a doubly linked list to keep track of the order of usage of cache items.

• Use a hashmap to store key-value pairs for quick access to cache items.

• When a new item is accessed, move it to the front of the linked list. If the cache is full, remove the least recently used item from the end of the list.
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Q1. Advance Excel (Vlookup, Index, Countifs, sumifs and others)
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Q2. Python Basics (data frame, data types, lamda, series etc)
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Q3. SQL Functions (joins, limits, partitions, orders by and group by)
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Q4. 3rd round was managerial round, where mostly non-technicial questions asked.
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