Vistaprint Senior Data Scientist Interview Questions and Answers for Experienced

React based
problem solving round

Mostly DSA expect DP, graph problems

Q1. Graph traversal + DP
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Asked medium level graph question.

Asked LLD question with at flow executable.

Q1. Asked HLD questions.
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Q1. Print the nodes of a n-ary tree in an arc wise manner as seen from the outside.
Ans. 
Print nodes of n-ary tree in arc wise manner from outside
• Traverse the tree level by level from outside to inside

• Use a queue to keep track of nodes at each level

• Print the nodes at each level in a clockwise or anticlockwise manner
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Q1. SQL Window function- hard
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Q2. Case study questions answers
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It was easy consisting of sql and excel questions

Python programming,SQL question

Q1. Asked some puzzle questions
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Q2. Asked one leetcode easy question. 3 sum
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Q1. Low Level Design for Chess
Ans. 
Low level design for a chess game including classes, functions, and data structures.
• Create classes for pieces (e.g. Pawn, Rook, Bishop) with properties like position and color

• Implement functions for moving pieces, checking valid moves, and capturing opponent pieces

• Use data structures like 2D arrays to represent the chess board and track piece positions
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