Porter Senior Software Engineer Interview Questions and Answers

Basic coding test from hackerearth.

Mettle Test based on DP based approach

Q1. Based on Tree, Graph, Segment Tree
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Q1. DS algo based on DP, Trees, Graphs
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Q1. Systed Design Round 1
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Q2. Design a Distributed Queue to have functionality similar to Kafka.
Ans. 
Design a distributed queue similar to Kafka.
• Use a distributed architecture with multiple brokers and partitions.

• Implement a publish-subscribe model for producers and consumers.

• Ensure fault tolerance and high availability through replication and leader election.

• Use a log-based storage system for messages and offsets.

• Provide support for message ordering and retention policies.

• Implement a scalable and efficient message de...read more
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Q3. Design Price Tagger System
Ans. 
Design a Price Tagger System
• Identify the products to be tagged with prices

• Determine the pricing strategy (e.g. cost-plus, value-based, etc.)

• Choose the appropriate tagging technology (e.g. barcode, RFID, etc.)

• Develop a user-friendly interface for tagging and updating prices

• Implement a database to store product and pricing information

• Integrate with point-of-sale systems for accurate pricing at checkout
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Q1. Design Search Systems
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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. 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

Q1. Node JS internal
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Q2. Previous project discussion
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Machine coding - design food ordering service,

Q1. Sort array having 0 , 1 and 2. do it in single pass
Ans. 
Use Dutch National Flag algorithm to sort array of 0s, 1s, and 2s in single pass.
• Initialize three pointers low = 0, mid = 0, high = n-1 where n is the length of the array.

• Iterate through the array and swap elements based on their values and positions.

• Example: Input array ['0', '1', '2', '0', '1', '2'] should be sorted as ['0', '0', '1', '1', '2', '2'].
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Q2. Given tree and list of nodes to be deleted. return all new trees created after the deletion
Ans. 
Return new trees after deleting specified nodes from a given tree
• Traverse the tree and delete nodes that match the given list

• For each deleted node, create a new tree with the remaining nodes

• Return all new trees created after deletion
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Q1. Design Restaurant management sytem
Ans. 
Restaurant management system to streamline operations, orders, inventory, and customer service.
• Include features for table management, order processing, menu customization, inventory tracking, and customer feedback.

• Implement user roles for staff, managers, and administrators with varying levels of access and permissions.

• Integrate payment processing systems for seamless transactions and reporting.

• Utilize data analytics t...read more
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Q1. Discussed about projects in depth
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Q2. Question around redis, kafka and all
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