Namshi Senior Software Engineer Interview Questions and Answers

It was a simple coding test.

There was a small coding problem involving oops concepts..

Q1. There was a simple System Design problem specifically URLShortener
Ans. 
Design a URL shortener that converts long URLs into shorter, manageable links.
• Use a hash function to generate a unique key for each URL.

• Store the mapping of short URLs to original URLs in a database.

• Implement a redirection service that retrieves the original URL using the short key.

• Consider using a custom domain for branding purposes.

• Implement analytics to track usage of shortened URLs.
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Q1. There was discussion about previous projects
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Q1. Insert node in BST
Ans. 
Insert a node in a Binary Search Tree (BST)
• Start at the root node and compare the value of the node to be inserted with the current node

• If the value is less than the current node, move to the left child. If greater, move to the right child

• Repeat the process until reaching a leaf node, then insert the new node as a left or right child
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Q2. Design Lift system
Ans. 
Design a lift system for efficient vertical transportation
• Consider the number of floors in the building

• Include safety features like emergency stop button

• Optimize for speed and energy efficiency

• Implement a user-friendly interface for passengers
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Q1. KAFKA MICRISERVICE ARCHITECTURE
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Basic coding test from hackerearth.

Q1. Design Search Systems
Ans. 
Designing search systems involves creating efficient algorithms and data structures to quickly retrieve relevant information.
• Understand the data structure of the search system (e.g. inverted index, trie)

• Implement efficient search algorithms (e.g. binary search, hash tables)

• Consider scalability and performance optimization techniques (e.g. caching, indexing)

• Include user-friendly features like autocomplete and spell corr...read more
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Q1. Linked list questions, array and string questions
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Q2. Rest api, microservices design patterns, design principles , System design, java detailed
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Q1. Rotate matrix by 90 degree
Ans. 
Rotate a matrix by 90 degrees.
• Transpose the matrix

• Reverse each row of the transposed matrix
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Q2. Longest substring with unique characters
Ans. 
The question asks for finding the longest substring in a given string that contains only unique characters.
• Iterate through the string and keep track of the current substring

• Use a set to check for duplicate characters

• Update the longest substring if a longer one is found
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Q1. A trie question
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Ecommerce hight level design